CA2026093C - Mobile telephone system capable of adapting a portable telephone set - Google Patents
Mobile telephone system capable of adapting a portable telephone setInfo
- Publication number
- CA2026093C CA2026093C CA002026093A CA2026093A CA2026093C CA 2026093 C CA2026093 C CA 2026093C CA 002026093 A CA002026093 A CA 002026093A CA 2026093 A CA2026093 A CA 2026093A CA 2026093 C CA2026093 C CA 2026093C
- Authority
- CA
- Canada
- Prior art keywords
- portable telephone
- telephone set
- memory
- identification numbers
- adaptor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3877—Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
- H04M1/6041—Portable telephones adapted for handsfree use
- H04M1/6075—Portable telephones adapted for handsfree use adapted for handsfree use in a vehicle
Abstract
A mobile telephone system comprises: a portable telephone set; an adaptor on a vehicle for the portable telephone set to rest thereon; a remote controller unit for dialing and voice talking; and a transceiver unit for modulating/demodulating voice signal and control signals, and transmitting/receiving radio frequency signals. The portable telephone set comprises means for electrically connecting to the adaptor when the portable telephone set is rested thereon, and a first control circuit for transferring identification numbers of the portable telephone set to the transceiver unit and then disabling a predetermined part of functions of the portable telephone set except charging a battery of the portable telephone set from the adaptor. The transceiver unit comprises a second control circuit for storing the identification numbers transferred from the portable telephone set, and allowing the transceiver unit and the control unit to operate as a vehicle telephone system using the identification number of the portable telephone set. The adaptor electrically connects between the portable telephone set, the remote control unit and the transceiver unit. The second control circuit may store second identification numbers so that the transceiver unit and the control unit may operate as an independent vehicle telephone system or as a multiple telephone number system.
Description
MOBILE TELEPHONE SYSTEM
CAPABLE OF ADAPTING A PORTABLE TELEPHONE SET
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a vehicular adaptor system which can adapt a portable telephone set to a vehicle having no vehicular telephone or to a vehicular telephone installed in a vehicle, used in a multiple carrier access system, such as a cellular mobile telephone system.
Description of the Related Arts Recently, portable telephones have been becoming smaller in size and lighter in weight, i.e. convenient to carry;
accordingly their numbers are~popularly increasing.
Portable telephone can be considered as a compact and light-weighted modification of the vehicular telephone owing to its less output power than the vehicular telephone so as to be easily portable, therefore, is used almost in the same way in the service area of the vehicular telephone. The portable telephone can be used in a vehicle; however, if it is used as it is, shielding effect of the metal body of the vehicle decreases the radio frequency wave propagation, i.e.
output power and receiving sensitivity, of the portable telephone, and may result in its disabled operation.
Therefore, there are employed a radio frequency 2 02 60g3 25307-252 booster/pre-amplifier installed in the vehicle and a vehicular antenna installed outside the vehicle.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 schematically illustrates a prior art system configuration adapting a portable telephone set;
Figure 2 schematically illustrates a configuration of the first preferred embodiment of the present invention;
Figure 3 schematically illustrates a perspective view of a first preferred embodiment of the present invention;
Figure 4 shows a principle block diagram of the first preferred embodiment of the present invention;
Figure 5 schematically illustrates an external view of the portable telephone set;
Figure 6 shows a circuit block diagram of the portable telephone set;
Figure 7 shows a circuit block diagram of a control unit;
Figure 8 shows a circuit block diagram of an adaptor;
Figure 9 shows a circuit block diagram of a transceiver unit;
Figure 10 shows interconnection of Figure 4 first preferred embodiment;
Figure 11 shows data st.ored in the portable telephone set;
Figures 12a and b show a flow chart of the function of the first preferred embodiment;
Figure 13 schematically illustrates a configuration of the second preferred embodiment of the present invention;
Figure 14 schematically illustrates a perspective view of a second preferred embodiment of the present invention;
Figure 15 shows a principle block diagram of the second preferred embodiment of the present invention;
Figure 16 shows interconnection of Figure 15 second preferred embodiment;
Figure 17 shows a circuit block diagram of an adaptor of the second preferred embodiment; and Figures 18a and b show a flow chart of the operation of the second preferred embodiment.
A prior art vehicular adaptor system of a portable telephone set is hereinafter described in reference to a perspec-tive view in Figure 1. A portable telephone set 11 is composed of a main body of the portable telephone set and an antenna (not seen there due to being integrated in the main body). The main body includes an earphone, a speaker, a key board, and a display for displaying a call number dialed onto the key board, etc.
When the portable telephone set 11 is rested in a cradle 12' of a vehicular adaptor 12, an end A4 of cradle 12' and an end A2 f portable telephone set 11 are electrically contacted so as to communicate control signals, audio signals and an adaptor signal informing the fact that the portable telephone set 11 is mounted on the adaptor, between the adaptor 12 and the portable telephone set 11, and the antenna integrated in the main body of the portable telephone set 11 is coupled with a radio frequency coupler (not seen in the figure) integrated in a side A3 of cradle 12' so as to face the integrated antenna. Adaptor 12 communicates control signals of booster 13 and radio frequency signals to/from booster/pre-amplifier 13 by means of a control signal cable and a radio frequency cable. Adaptor 12 further communicates up-link/down-link data and audio signals to/from a remote control unit (referred to hereinafter as control unit) 14 by means of another cable.
~ 25307-252 Functions of the above-described adaptor system for the portable telephone is summarized as follows:
1. The portable telephone set brought into the vehicle is rested on vehicular adaptor 12. Then, a battery installed in the portable telephone set is charged by a charging circuit of the adaptor.
2. 0.6 watt output power of the portable telephone set is fed via vehicular adaptor 12 to radio frequency booster 13, where 0.6 watt is amplified up to 3 watt.
CAPABLE OF ADAPTING A PORTABLE TELEPHONE SET
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a vehicular adaptor system which can adapt a portable telephone set to a vehicle having no vehicular telephone or to a vehicular telephone installed in a vehicle, used in a multiple carrier access system, such as a cellular mobile telephone system.
Description of the Related Arts Recently, portable telephones have been becoming smaller in size and lighter in weight, i.e. convenient to carry;
accordingly their numbers are~popularly increasing.
Portable telephone can be considered as a compact and light-weighted modification of the vehicular telephone owing to its less output power than the vehicular telephone so as to be easily portable, therefore, is used almost in the same way in the service area of the vehicular telephone. The portable telephone can be used in a vehicle; however, if it is used as it is, shielding effect of the metal body of the vehicle decreases the radio frequency wave propagation, i.e.
output power and receiving sensitivity, of the portable telephone, and may result in its disabled operation.
Therefore, there are employed a radio frequency 2 02 60g3 25307-252 booster/pre-amplifier installed in the vehicle and a vehicular antenna installed outside the vehicle.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 schematically illustrates a prior art system configuration adapting a portable telephone set;
Figure 2 schematically illustrates a configuration of the first preferred embodiment of the present invention;
Figure 3 schematically illustrates a perspective view of a first preferred embodiment of the present invention;
Figure 4 shows a principle block diagram of the first preferred embodiment of the present invention;
Figure 5 schematically illustrates an external view of the portable telephone set;
Figure 6 shows a circuit block diagram of the portable telephone set;
Figure 7 shows a circuit block diagram of a control unit;
Figure 8 shows a circuit block diagram of an adaptor;
Figure 9 shows a circuit block diagram of a transceiver unit;
Figure 10 shows interconnection of Figure 4 first preferred embodiment;
Figure 11 shows data st.ored in the portable telephone set;
Figures 12a and b show a flow chart of the function of the first preferred embodiment;
Figure 13 schematically illustrates a configuration of the second preferred embodiment of the present invention;
Figure 14 schematically illustrates a perspective view of a second preferred embodiment of the present invention;
Figure 15 shows a principle block diagram of the second preferred embodiment of the present invention;
Figure 16 shows interconnection of Figure 15 second preferred embodiment;
Figure 17 shows a circuit block diagram of an adaptor of the second preferred embodiment; and Figures 18a and b show a flow chart of the operation of the second preferred embodiment.
A prior art vehicular adaptor system of a portable telephone set is hereinafter described in reference to a perspec-tive view in Figure 1. A portable telephone set 11 is composed of a main body of the portable telephone set and an antenna (not seen there due to being integrated in the main body). The main body includes an earphone, a speaker, a key board, and a display for displaying a call number dialed onto the key board, etc.
When the portable telephone set 11 is rested in a cradle 12' of a vehicular adaptor 12, an end A4 of cradle 12' and an end A2 f portable telephone set 11 are electrically contacted so as to communicate control signals, audio signals and an adaptor signal informing the fact that the portable telephone set 11 is mounted on the adaptor, between the adaptor 12 and the portable telephone set 11, and the antenna integrated in the main body of the portable telephone set 11 is coupled with a radio frequency coupler (not seen in the figure) integrated in a side A3 of cradle 12' so as to face the integrated antenna. Adaptor 12 communicates control signals of booster 13 and radio frequency signals to/from booster/pre-amplifier 13 by means of a control signal cable and a radio frequency cable. Adaptor 12 further communicates up-link/down-link data and audio signals to/from a remote control unit (referred to hereinafter as control unit) 14 by means of another cable.
~ 25307-252 Functions of the above-described adaptor system for the portable telephone is summarized as follows:
1. The portable telephone set brought into the vehicle is rested on vehicular adaptor 12. Then, a battery installed in the portable telephone set is charged by a charging circuit of the adaptor.
2. 0.6 watt output power of the portable telephone set is fed via vehicular adaptor 12 to radio frequency booster 13, where 0.6 watt is amplified up to 3 watt.
3. Radio frequency signal to be input to portable telephone set 11 is amplified so as to compensate coupling losses at the radio frequency coupler, etc., accordingly becomes the level as strong as the level of the portable telephone set used outside the vehicle.
4. Control unit 14 is used in the same way as a vehicular telephone set, i.e. is used as a hand set for talking, for dialing a call number via its key board and for displaying the phone number, etc. thereon.
For using portable telephone 11 in a vehicle on which a vehicle telephone has been already installed, all of Fig.
1 adaptor system is independently required in addition, except for a commonly used vehicular antenna.
Problems of the prior art Fig. 1 adaptor system are in that:
Having to control both of the control unit and the radio frequency power booster/pre-amplifier, the adaptor 202~ 093 25307-252 unit becomes complicated in configuration and large in si2e.
(2) For connecting the integrated antenna of the portable telephone set to the radio frequency booster/pre-amplifier, a radio frequency coupler is required in the adaptor causing complicated structure and precise mechanism.
~ 3) The vehicular adaptor becoming large in size causes the system to become large and occupy a large space in the vehicle.
~ 4) A portable telephone set to be used in a vehicle already having a vehicle telephone installed thereon requires a considerable in~estment for the duplicated radio frequency circuits as well as a large space therefor.
SUMMARY OF THE INVE~TION
It is therefore an objectcof the present invention to provide a less expensive and less spacious vehicular adaptor system capable of adapting a portable telephone to a vehicle.
It is another object of the present invention to provide a vehicular telephone system ~hich can place/answer a call by either identification number of the vehicular telephone or of a portable telephone adapted to the vehicular telephone system.
A mobile telephone system according to the present invention comprises: a portable telephone set; an adaptor for the portable telephone set to rest thereon; a remote 202bO~3 25307-252 control unit for diallng and voice talking; and a transcelver unlt for modulating/demodulating voice slgnal and control slgnals, and transceivlng radio frequency slgnals. The portable telephone set further comprlses means for electrlcally connecting to the adaptor on a vehicle when the portable telephone set Is rested thereon, and a fIrst control circuit for transferrlng Identification numbers of the portable telephone set to the transcelver unlt and then disabling a predetermlned part of functions of the portable telephone set except charglng a battery of the portable telephone set from the adaptor. The transceiver unlt comprlses a second control clrcult for storlng the identification numbers transferred from the portable telephone set, and the transcelver unlt and the remote control unit are allowed to operate as a vehicle telephone system using the identification numbers of the portable telephone set. The adaptor further connects electrically between the portable telephone set, the control unlt and the transceiver unit. The second control circuit in the transceiver unit may addltionally store a second identi~ication numbers so that the transceiver unit and the control unit may operate as an independent vehicle telephone system even when the portable telephone set Is not adapted to the adaptor. A system according to a second aspect comprises the same transceiver unit as described above; a second adaptor which is connected wlth the portable 202~0~ 25307-252 telephone set via cables and outputs an adaptor signal when the portable telephone set is connected thereto. On receiving the adaptor signal, the portable telephone set transfers the identification numbers to the transceiver unit and then disables predetermine part of functions of the portable telephone set while charging the battery on the portable telephone set from the adaptor. The portable telephone set is picked up from the adaptor, so as to be handled in the same way as the remote control unit of the first invention, i.e. to dial via the keyboard as well as to talk via the microphone and earphone of the portable telephone set. Then, the transceiver unit operates in the same way as the first invention. The less expensive transceiver unit produced in a mass quantity for vehicular telephone system allows less expensive system configuration for the portable telephone set to be used in a vehicle.
According to a broad aspect of the invention there is provided a mobile telephone system comprising:
a portable telephone set capable of operating outside a vehicle, including:
a keyboard;
a microphone;
an earphone;
a battery;
a first memory for storing identification numbers registered to said portable telephone set;
a first transceiver circuit including a transmitter circuit and a receiver circuit, said first transceiver circuit receiving 202~0g3 and transmitting a radio frequency wave carrying voice signals and the identification numbers;
a first control circuit, coupled to said first memory, for controlling placing/answering of a call according to the identification numbers stored in said first memory; and first electrical connection means;
a transceiver unit installed in the vehicle, including:
a second transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers of said portable telephone set when the identification numbers are transferred to said second transceiver circuit;
a second memory for storing the identification numbers;
a second control circuit, coupled to said second memory and said second transceiver circuit, for transferring the identification numbers to said second transceiver circuit and for controlling placing/answering of a call according to the identification numbers stored in said second memory; and adaptor means installed in the vehicle, comprising:
second electrical connection means for connecting to said first electrical connection means, and for outputting an adaptor signal, said first control circuit transferring the identification numbers stored in said first memory to said second memory on receiving the adaptor signal; and wirings to connect to said transceiver unit, said portable telephone set further including means for disabling a power supply to said first control circuit after the identification numbers stored in said first memory are transferred 8a to said second memory.
According to another broad aspect of the invention there is provided a mobile telephone system comprising:
a portable telephone set capable of operating outside a vehicle, said portable telephone set including:
a first memory for storing identification numbers corresponding to said portable telephone set; and a first control circuit, coupled to said first memory, for controlling placing~answering of a call according to the 0 identification numbers;
a transceiver unit for installation in the vehicle, including:
a transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers;
a second memory; and a second control circuit, coupled to said second memory and said transceiver circuit, for controlling placing/answering of a call;
an adaptor for electrically connecting said portable telephone set to said transceiver unit when said portable telephone set is to be used in the vehicle r and for outputting an adaptor signal which causes the first control circuit to transfer the identification numbers stored in said first memory to said second memory, so that said portable telephone set, said transceiver unit and said adaptor unit form a vehicle telephone having the identification numbers corresponding to said portable telephone set, 8b 20260~
said portable telephone set further including means for disabling power supply to said first control circuit after the identification numbers stored in said first memory are transferred to said second memory.
The above-mentioned features and advantages of the present invention, together with other objects and advantages, which will become apparent, will be more fully described hereinafter, with reference being made to the accompanying drawings which form a part thereof, wherein like numerals refer to like parts throughout.
8c DESCRIPTION OF THE PREFERRED EMBODIMENTS
A schematic configuration of a first preferred embodiment of the present invention is shown in Figure 2. A
perspective view of Figure 2 is shown in Figure 3, and a principle block diagram is shown in Figure 4. A portable telephone set 21 comprises: a function ceasing circuit 31;
a first control circuit 32; a first memory 33; a battery 34;
a key board 21-1; a display 21-2 and a plurality of contacts 21-5 for electrically connecting to later-described adaptor 22. Adaptor 22 is installed in a vehicle and has a cradle 22-1 to detachably hold portable telephone set 21 thereon.
Adaptor 22 comprises: at an inner sidewall of cradle 22-1 a plurality of contacts 310 (not shown in Figure 3 but in Figure 8) for contacting the contacts 21-5 when portable telephone set 21 is held thereon; internal wirings for interconnecting the signals to/from a transceiver unit 23 and the signals to/from a control unit 24; and a charging circuit 35 for charging battery 34, and on holding portable telephone set 21 thereon transmits an adaptor signal ADPT to portable telephone set 21. Transceiver unit 23 is installed in the ~J
vehicle and comprises a transceiver circuit 36 which transmits a radio frequency signal of a predetermined frequency and power carrying a transmitting audio AUD/TX
and the identification numbers, etc., i.e. transmitting data DAT/TX, as well as outputs from a received-signal input from a vehicle antenna VHC ANT a received-audio signal AUD/RV and a received-control data DAT/RV; a second memory 37 which stores the identification numbers, etc. as control signals, transferred from portable telephone set 21; and a third control circuit 38. Remote control unit (referred to hereinafter as control unit) 24 is installed in the vehicle and comprises a microphone and an earphone (both denoted with the numeral 41); a handset 28 carrying a keyboard 40;
and a second control circuit 39 for processing the signals input/output to/from the hands~et 28.
Operations of the above system is hereinafter described.
When portable telephone set 21 is installed on adaptor 22, and accordingly, adaptor signal ADPT is received from adaptor 22, first control circuit 32 transfers the data, such as identification numbers, stored in first memory 22 via adaptor 22 to second memory 37, as well as battery 34 i~
charged from charging circuit 35 of adaptor 22. After waiting a predetermined period, such as 10 second after receiving the adaptor signal ADPT, function-ceasing circuit 31 disables a supply of power source voltage to, for example, a transceiver circuit (not shown in Fig. 4, but described later) in portable telephone set 21, while the battery charging is kept on. Operations necessary for a mobile telephone, such as placing/answering a call, are accomplished by the use of the identification numbers stored in second memory 37, of transceiver unit 23 while satisfying the required transmitting power and receiving sensitivity.
Further details of the first preferred embodiment are hereinafter described. An external view and circuit configuration of portable telephone set 21 are schematically illustrated in Fig. 5 and circuit diagram Fig. 6, respectively. In Fig. 6, the portions denoted with * marks, i.e. switches 201 and 221 and wirings connected from these switches to external terminals, are not used for portable telephone set 21 of the first preferred embodiment, but used for the second preferred embodriment to be described later.
Circuit configuration of control unit 24 is shown in Fig. 7, where the second control circuit 39 is surrounded with dotted lines. Circuit configuration of adaptor 22 is shown in Fig. 8, which comprises power switch 301, power switch control circuit 302, charging circuit 303 (denoted with the numeral 35 in Fig. 4~ which determines its charging current, and charge control switch 304. Circuit configuration of transceiver unit 23 is shown in Fig. 9. Mutual connections, via adaptor 22, between portable telephone set 21 installed thereon, transceiver unit 23 and control unit 24 are shown in Fig. 10.
At first, an out-of-vehicle operation of portable telephone set 21 is hereinafter described, in reference to the Fig. 6 configuration of portable telephone set. In Fig.
6, a group of radio frequency circuits denoted with the numerals from 113a (duplexer) to 109 (transmitter synthesizer with modulator) is called a transmitter circuit;
a group of low frequency circuits denoted with the numerals from 108 (summing circuit) to 103 (band-pass filter) is called a transmitting-audio circuit; a group of low frequency circuits denoted with the numerals from 113b (duplexer) to 126 (discriminator)is called a receiver circuit; a group of low frequency circuits denoted with the numerals from 122 (amplifier) to 125 (de-emphasizer) is called a received audio circuit; and a circuit denoted with the numeral from 131 (display)_ to 140 (RAM) is called a digital control circuit. Further details of each of these circuits are hereinafter described.
(1) Transmitter circuit and transmitting-audio circuit.
An audio signal output from microphone 101, passing microphone amplifier 102 and bandpass filter lQ~
(referred to hereinafter as BPF) for allowing a 300 Hz to 3 KHz audio signal to pass, has its dynamic range compressed down to 2:1 by compressor 104, next has its frequency characteristics adjusted to 6 db/octave by pre-emphasiss circuit 105, and next has its maximum frequency deviation limited to below a predetermined level by an instantaneous frequency deviation limiter 106 so that the maximum frequency deviation does not exceed a predetermined level even when a loud voice is talked. Next, the pass-band of the signal is narrowed in splatter filter 107 by suppressing the higher harmonics components of the signal. The signal is then added with the transmittal signal DAT/TX including the above-described identification numbers, etc. by summing circuit 108 so as to generate a modulation signal. The modulation signal directly modulates transmitter synthesizer with modulatlor 109 so as to generate a frequency-modulated ~FM~ signal. This FM signal, via bandpass filter 110, power amplifier 112 and duplexer 113a, is transmitted from antenna ANT. On being pulled up, the antenna ANT operates as an external antenna. When the a~tenna is pushed in, the circuit is automatically switched to connect to an integral antenna by a switch (not seen in the figure).
~2) Receiver circuit and received audio circuit.
A radio frequency signal received by the antenna is input via duplexer 113b, pre-amplifier 133 and BPF 130, to mixer 129. Mixer 12g being also input with the output signal of receiver synthesizer 132 via another BPF 1~1, converts the frequency of the signal input thereto so as to generate an FM intermediate frequency (referred to hereinafter as IF) signal. This FM signal, via internal frequency amplifier 127, is discriminated by frequency 202609~
discriminator 126. Out of the discriminated signal a digital signal and an audio signal are separated. The digital signal is input to control circuit 32 and the audio signal is output, via de-emphsiss circuit 125, BPF 124, expander 123, and audio amplifier 122, to earphone 121.
Power source circuit 150 in portable telephone set 21 generates necessary voltages.
(3) Digital control circuit.
Identification numbers of the portable telephone set 21, such as own mobile identification numbers, the manufacturer's code number, the apparatus serial number and mobile identification number, which are legally required for placing/answering a call for position registration, and for zone switching, has been written in ROM (read only memory) 139 in advance. When the power switch is closed, the data in ROM 139 is loaded to RAM 140 by a CPU (central processing unit) 135 according to a program installed in ROM 139 in advance. Furthermore, as many as several tens of phone numbers which have been input by a memory dialing function or a phone number of the last-number re-dialing function, etc. have been stored in RAM 140. Contents of the data are shown in Fig. 11, as an example. According to the data in RAM 140, CPU 135 carries out the controls of: (a) answering a call; (b) placing a call; (c) position registration; (d) ~one switching during a call; and (e) ending a call.
Operation of the digital control circuit of the portable 202609~
telephone set 21 rested on adaptor 22 will be described later.
(a) Control to answer a call.
Digital signals, i.e. the received data DAT/RV
separated from the above-mentioned demodulated signal, is decoded by decoder 137. Errors in the decoded signal are corrected by error correction circuit 136. The corrected signal is checked via I/O control circuit 134 by CPU 135 whether the received data is of the own telephone number.
If it is the own number, CPU 135 instructs data generation circuit 138 to generate transmitting data DAT/TX necessary for connecting to a channel instructed by the base station.
Thus, the transmitting data is responded with an acknowledge signal to the base station so as to establish the channel connection.
(b) Control to place a call.
In placing a call, the opposite party's telephone number dialed into keyboard 132 is processed by sub CPU 133, and is input via I/O control circuit 134 (whose function is described later) to main CPU 135, which then instructs, via I/O control circuit 134, data generator 138 to match own telephone number with the opposite party's control signal, such as identification numbers, etc., so as to generate transmitting data DAT/TX. Transmitting data DAT/TX input to summing circuit 108 as described above is transmitted out to the base station.
202609~
(c) Control to register the position.
Zone information indicating the current zone is constantly transmitted from each base station; therefore the mobile station, i.e. portable telephone set, compares the received information with the zone information of the home zone where the portable telephone is registered to so as to recognize whether the mobile station is currently located in the home zone. On moving into the adjacent zone, the portable telephone, which receives adjacent zone's information different from that of the home zone, transmits to the base station the own telephone number, which is then confirmed by an acknowledge signal from the base station, so as to renew the own number registration thereto.
{d) Control to switch the zone while talking.
When a base statio~, which is constantly watching the electric field intensity of the signals sent from each mobile station, detects a decrease in the electric field intensity of the mobile station, the base station sends the detected results to the central control station which controls all the base stations in its control zone. The control station then requests all the base stations in the control zone to watch their receiving signal levels, so as to find and switch to the zone which the mobile station is to move into, according to the watched data.
(e) Control to end a call.
Disconnect the speech channel connected with the 202609~
base station, when the talk is finished.
(f) Other controls.
A display 131 displays the calling number or the status of the telephone, such as a busy state. I/O
controller 134 carries out an interface between sub-CPU 133, data correction circuit 136 and data generation circuit 138.
For the communication between the base station and the mobile station for the above-described controls, only the necessary data are read out of the data written in RAM 140, and are sent out in a predetermined format, as typically shown in Fig. 11, to the base station.
Operation of the portable telephone set 21 installed on adaptor 22 in a vehicle is hereinafter described. When portable telephone set 21 is rested on adaptor 22, a micro switch 304 detecting the e~istence of portable telephone set 21 is closed to supply a power source voltage so that adaptor 22 transmits an adaptor signal ADPT to portable telephone set 21. On receiving the adaptor signal ADPT, first control circuit 32 transfers the data, such as the identification numbers, etc., stored in RAM 140 (33~, via adaptor 22 to the second RAM 240 in transceiver unit 23, as an up-link data DAT/UP. After waiting a period, for example, 10 s preset in timer 152 after completion of the data transfer, the supply of power source voltage to, for e~ample, the transmitter circuit of portable telephone set 21 is discontinued so as to disable the function as a 202609~
portable telephone set 21. The data transfer and the power supply discontinuation are instructed by CPU 135 in first control circuit 32 according to the program in ROM 139.
Function-ceasing circuit 31 shown in Fig. 4, i.e. timer 152 shown in Fig. 6, is composed of this operation of CPU 135 according to the program. A flow chart of these operations are shown in Figs. 12. Operation of the charging circuit is described later in detail in the description of adaptor 22.
If a new telephone number is input for a memory call ~ria control unit 22 to the second RAM 240, this number is also input to first RAM 140 by CPU 235 and CPU 135, so that the newly input telephone number can be used for a memory call from portable telephone set 21 e~en after portable telephone set 21 is taken out of the vehicle.
Circuit configuration of transceiver unit 23 shown in Fig. 9 is basically identical to that of portable telephone set 21 shown in Fig. 6, except that the transmitting power is 3 W, there is none of handset, keyboard, display, earphone, microphone, charging circuit nor battery, and the way of using the RAMs which store the identi~ication numbers, etc.. Therefore, the corresponding circuits are denoted with the numerals having the same last-two digits.
Operation of transceiver unit 23 is hereinafter described:
(1) Transmitter circuit and transmitting-audio circuit.
Transmitting-audio signal AUD/TX output from handset 28 of control unit 24 goes via adaptor 22 to microphone amplifier 202, bandpass filter (BPF) 203, and compressor 204 where the dynamic range is compressed to 2:1, and further goes to pre-emphasiss circuit 205, instantaneous frequency deviation limiting circuit 206 and splatter filter 207, so as to compress its harmonic components and to limit the bandwidth. Output from splatter filter 207 is added with transmitting data DAT/TX including the above-described identification numbers by su~ning circuit 208. The added signal is input, as an modulation signal, to transmitter synthesizer with modulator 209, which then outputs an FM
signal. The FM signal is output, via BPF 210, power amplifier 212 and duplexer 213, to vehicular antenna VHC
ANT, so as to transmit, for example, 3 watt radio frequency power.
(2) Receiver circuit and received-audio circuit.
Received radio frequency signal goes to duplexer 213b and pre-amplifier 233, and is input via BPF 229 to mixer 299, to which the output of receiver synthesizer 232 is also input. Frequencies of thus input signals are converted therein to output an FM IF signal. This FM IF signal passing through BPF 228 is amplified by IF amplifier 227.
The amplified signal is discriminated by FM discriminator 226, an output of which is separated into a analog signal and a digital signal. The analog signal is sent via de-emphasiss eireuit 225, BPF 224 and expander 223 to audioamplifier 222, from whieh reeeived-audio signal AUD/RV is output so as to input to earphone 186 of handset 28 of eontrol unit 24.
~3) Control eircuit.
Digital signal, i.e. reeeived data signal DAT/RV, output from frequeney diseriminator 226 is input to data deeoder 237 and then to error eorreetor 236, from whieh eorreeted data is output. Main CPU 235 eheeks the data via I/O eontroller 234 whether the data is of the own telephone number stored in RAM 240. If it is true, CPU 235 executes the proeedure neeessary for the mobile telephone in response to the eontrol of the base station in the same way as that deseried for the portable telephone. In plaeing a call, CPU
235 e~ecutes the procedure neeessary for plaeing a eall according to an up-link data DAT/UP (which is described later) dialed in eontrol unit 24 and the data transferred from portable telephone set 21 and now stored in RAM 240.
Deseription about ROM 239 is given later.
(4) Power supply circuit.
When a power supply switch 188 in control unit 24 is manually activated and the ignition sense line is also activated by an ignition switch or an aecessory switch of the vehicle, power switch 250 in transceiver unit 23 is activated so as to deliver the power supply voltage from a vehicle battery (shown in Fig. 10) to the circuits in transceiver unit 23 and to control unit 24 via adaptor 22.
In adaptor 22 whose circuit configuration is shown in Fig. 8, charge control switch 304 is formed of a micro switch, which is actuated by portable telephone set 21 resting on adaptor 22 so as to become conductive. Driven by the output of charge control switch 304 and ignition sense line, power switch control circuit 302 enables power switch 301 to deliver the vehicle battery voltage via charging circuit 303 to battery 151 in portable telephone set 21, so that battery 151 is charged. Charging circuit 303 determines the charging current as well as detects completion of the charge.
Thus, control unit 24, adaptor 22 and transceiver unit 23 together can also function as an independent vehicle telephone having no portable telephone set adapted thereto as well as an adaptor system for a portable telephone set.
Therefore, identification numbers, etc. registered to this independent vehicle telephone may be written in ROM 239 in advance. Then, according to the data loaded in RAM 240 from ROM 239 the operations to place/answer a call are executed in the same way as the above-described preferred embodiment.
Moreover, for the case where portable telephone set 21 is adaptable to the vehicle telephone, CPU 235 may be programmed in ad~ance so that the vehicle telephone can place/answer a call according to the multiple phone numbers stored in RAM 240, i.e. of the vehicle telephone and portable telephone. Then, the owner of the portable telephone will never miss a call for either phone number while he is in the vehicle.
Control unit 24 may further have a speaker unit 29 and a hand-free microphone 30, for allowing hand-free talking without picking up handset 28.
The system configurations according to the above-described preferred embodiments is advantageous in the following effects:
(1~ Vehicle telephone system according to the above preferred embodiments can be available at a less expensive cost than the Fig. 1 power booster/pre-amplifier system which must be produced in relatively small quantity, because transceiver 23 is produced in a very large quantity for the popular vehicle telephone systems even though more complex circuitry is employed therein than prior art power booster/pre-amplifier 13.
(2) The function to transfer the identification numbers is additionally required to the portable telephone set; however, this addition can be done by a simple addition of the program, causing no increase in the production cost.
(3~ Control unit, the hand set, being also produced in a very large quantity for vehicle telephones can be inexpensive as well as excellent in its handling in the vehicle.
~ 4) Adaptor 2 is simpler and smaller, accordingly less expensive, than that of the prior art which requires a radio frequency coupler.
~ 5) Only a small investment in an inexpensive adaptor 22 allows one who already has a vehicle telephone to use a portable telephone in the vehicle.
~ 6) One who already has a portable telephone can also purchase a vehicle telephone at a cost equal to or less than the cost for purchasing the Fig. 1 prior art system which is considerably expensive.
A second preferred embodiment of the present invention is hereinafter described in reference to a schematic configuration Fig. 13, and a perspective view Fig. 14 and a principle block diagram Fig. 15. In the second preferred embodiment, the key board 25-1, display 25-2, microphone 25-3 and earphone 25-4, of porctable telephone set 25 are utilized in place of control unit 24 of the first preferred embodiment. An adaptor 26 is formed of an adaptor unit 262 and a holder 261 hung typically on a wall or dash board of the vehicle so as to just mechanically hang portable telephone set 25 as shown in Fig. 14, where portable telephone set 25 is now picked up from holder 261. Adaptor unit 262 relays electrical connections between portable telephone set 25 and transceiver unit 23, by means of cables 263 and 264, each having a plurality of wirings. That is, instead of exposed contacts 25-1 of the first preferred embodiment, the electrical connections between portable telephone set 25 and adaptor unit 262 are carried out by cable 264, an end of which has a modular jack to be detachably inserted into a socket (not seen in Fig. 14~
provided at the bottom end of portable telephone set 25.
Circuit configuration of portable telephone set 25 is shown in Fig. 6 where the * marked portions, which are not used in the first preferred embodiment, are used now. When the modular jack is inserted to the socket, an adaptor signal ADPT carried by one of the wirings of cable 264 is input to I/O control circuit 134 of portable telephone set 25, whereby the identification numbers, and other information, stored in RAM 140 is transferred via adaptor unit 262 to RAM
240 of transceiver unit 23 in the same way as the first preferred embodiment, and after waiting a period predetermincd by timer 15 (152~ power supply voltage to, for example, transmitting circuit of portable telephone set 25 is disabled; further more, switches 201 and 221 disconnect microphone 101 and its amplifier 102 and earphone 121 and its amplifier 220 from respective amplifiers 103 and 122, so as to connect to the wirings of cable 264, each denoted with AUD/TX and AUD/RV in Fig. 6. On and after these operations, the power voltage supply is kept on to charge battery 151 in the same way as the first preferred embodiment. Internal circuit of adaptor unit 262 is shown in Fig. 17, where charging circuit 35 and the related circuits are identical to those of the first preferred embodiment. Up-link/down-link control circuit 30' controls connections of the signalsbetween portable telephone set 25 and transceiver unit 23.
In placing/answering a call, portable telephone set 25 is picked up from holder 261 so as to be used as control unit 24 of the first preferred embodiment. That is, the telephone number to call is input to key board 25-1 of portable telephone set 25. The input number is processed by sub CPU 133, and then input via I/O control circuit 134 and data generator circuit 138 to transceiver unit 34, where the procedure for placing the call may be carried out according to the memory-dial numbers and the identification data stored in RAM 240 of transceiver unit 23. These operations initiated by adaptor signal are executed by the first control circuit 32 according to a program installed in ROM
139 in advance in the same way~as the first preferred embodiment. Voice talk is carried out with microphone 101 and earphone 121 (Fig. 6), both of portable telephone set 25, whose voice signals are sent/received via adaptor unit 262 to/from trans~eiver llnit 23. After portable telephone set 25 is picked up from holder 261, a hook key of the keyboard is pushed so as to transmit a hook signal HOO~ via adaptor unit 262 to transceiver unit 23, or a micro switch (not shown in figures~ may be provided on holder 261 so as to detect the existence of portable telephone set held in holder 261 and generate the hook signal HOOK when portable telephone set 25 is removed fr-om holder 261. Cable 264 may , 24 202609~
be detachably connected to adaptor unit 262 by means of plug and socket (not shown in the figures~, where the plug may actuate a micro switch (not seen in the figure~ provided in adaptor 262 so as to generate adaptor signal ADPT. Circuit configuration and operation of transceiver unit 23 are identical to those of the first preferred embodiment, as shown in Fig. 9. Flow chart of the above-described operations are shown in Figs. 18.
The system configuration according to the above second preferred embodiment is advantageous in items (1~, (2) and (4~ of the effects of the above first preferred embodiment.
As for effect (3~, the portable telephone set being used as a handset and held in the holder when not in use, is advantageous in its easy handling in the vehicle. As a result of all, owing to the e~ployment of inexpensive additional components, there can achieve a system superior in cost, compactness a.nd system expandability to the Fig. 1 prior art system.
Though in the a.bove first preferred embodiment the electrical connections between the portable telephone set and the vehicular adaptor are accomplished by the automatic conta.ct between contacts respectively provided exposingly upon a side of each body when the portable telephone set is placed on the adaptor, it is apparent that this contact connection may be replaced with the detachable connection performed by the cable, jack and socket as described in the second preferred embodiment.
Though in the above preferred embodiments, on receiving the adaptor signal the portable telephone set disables the transmitting circuit, the purpose of this operation is to disable the portable telephone set so as to be a device for placing a call; therefore, one or some of the circuits, such as the transmitter circuit; the receiver circuit, the first control circuit and the audio frequency circuit, may be disabled in order to achieve the purpose. The circuit(s) to be disabled is determined depending on an optional function which is not described in the description of the above preferred embodiments. Therefore, as long as any means to protcct portable telephone set from unexpected erroneous operation is satisfactorily provided, it is not always necessary to disable the circ~it(s).
Though in the above description of the second preferred embodiment switches 201 and 221 are provided in portable telephone set 25, these switches are not always necessary, i.e. amplifiers 102 and 220 may be always connected respectively to BPF 103 and amplifier 122 and corresponding one of cables 263, as long as the voice routes via BPF 103 and via amplifier 122 can -be disabled so that the voices from/to microphone 101/earphone 121 do not disturb or are not disturbed by these routes. In other words, the switches may be omitted if the power source voltage supply to audio circuits in the transmitting circuit and the receiving circuit can be disabled.
Though the above description for the preferred embodiments are given for the case where the power switch of the portable telephone set has been already conductive when the portable telephone set is connected to the adaptor, if the power switch is then non-conductive, the adaptor signal ADPT actuates the power switch to be conductive and then initiates the transfer of the identification numbers to the transceiver unit.
Though in the description of the preferred embodiments the identification numbers are transferred from the RAM in the portable telephone set because RAM is faster than ROM, it is apparent that the identification numbers may be transferred from ROM of the portable telephone set.
The many features and adva~ntages of the invention are apparent from the detailed specification and thus, it is intended by the appended claims to cover all such features and advantages of the methods which fall within the true spirit and scope of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not detailed to limit the invention and ac~ordingly, all suitable modifications are equivalents ma.y be resorted to, falling within the scope of the invention.
For using portable telephone 11 in a vehicle on which a vehicle telephone has been already installed, all of Fig.
1 adaptor system is independently required in addition, except for a commonly used vehicular antenna.
Problems of the prior art Fig. 1 adaptor system are in that:
Having to control both of the control unit and the radio frequency power booster/pre-amplifier, the adaptor 202~ 093 25307-252 unit becomes complicated in configuration and large in si2e.
(2) For connecting the integrated antenna of the portable telephone set to the radio frequency booster/pre-amplifier, a radio frequency coupler is required in the adaptor causing complicated structure and precise mechanism.
~ 3) The vehicular adaptor becoming large in size causes the system to become large and occupy a large space in the vehicle.
~ 4) A portable telephone set to be used in a vehicle already having a vehicle telephone installed thereon requires a considerable in~estment for the duplicated radio frequency circuits as well as a large space therefor.
SUMMARY OF THE INVE~TION
It is therefore an objectcof the present invention to provide a less expensive and less spacious vehicular adaptor system capable of adapting a portable telephone to a vehicle.
It is another object of the present invention to provide a vehicular telephone system ~hich can place/answer a call by either identification number of the vehicular telephone or of a portable telephone adapted to the vehicular telephone system.
A mobile telephone system according to the present invention comprises: a portable telephone set; an adaptor for the portable telephone set to rest thereon; a remote 202bO~3 25307-252 control unit for diallng and voice talking; and a transcelver unlt for modulating/demodulating voice slgnal and control slgnals, and transceivlng radio frequency slgnals. The portable telephone set further comprlses means for electrlcally connecting to the adaptor on a vehicle when the portable telephone set Is rested thereon, and a fIrst control circuit for transferrlng Identification numbers of the portable telephone set to the transcelver unlt and then disabling a predetermlned part of functions of the portable telephone set except charglng a battery of the portable telephone set from the adaptor. The transceiver unlt comprlses a second control clrcult for storlng the identification numbers transferred from the portable telephone set, and the transcelver unlt and the remote control unit are allowed to operate as a vehicle telephone system using the identification numbers of the portable telephone set. The adaptor further connects electrically between the portable telephone set, the control unlt and the transceiver unit. The second control circuit in the transceiver unit may addltionally store a second identi~ication numbers so that the transceiver unit and the control unit may operate as an independent vehicle telephone system even when the portable telephone set Is not adapted to the adaptor. A system according to a second aspect comprises the same transceiver unit as described above; a second adaptor which is connected wlth the portable 202~0~ 25307-252 telephone set via cables and outputs an adaptor signal when the portable telephone set is connected thereto. On receiving the adaptor signal, the portable telephone set transfers the identification numbers to the transceiver unit and then disables predetermine part of functions of the portable telephone set while charging the battery on the portable telephone set from the adaptor. The portable telephone set is picked up from the adaptor, so as to be handled in the same way as the remote control unit of the first invention, i.e. to dial via the keyboard as well as to talk via the microphone and earphone of the portable telephone set. Then, the transceiver unit operates in the same way as the first invention. The less expensive transceiver unit produced in a mass quantity for vehicular telephone system allows less expensive system configuration for the portable telephone set to be used in a vehicle.
According to a broad aspect of the invention there is provided a mobile telephone system comprising:
a portable telephone set capable of operating outside a vehicle, including:
a keyboard;
a microphone;
an earphone;
a battery;
a first memory for storing identification numbers registered to said portable telephone set;
a first transceiver circuit including a transmitter circuit and a receiver circuit, said first transceiver circuit receiving 202~0g3 and transmitting a radio frequency wave carrying voice signals and the identification numbers;
a first control circuit, coupled to said first memory, for controlling placing/answering of a call according to the identification numbers stored in said first memory; and first electrical connection means;
a transceiver unit installed in the vehicle, including:
a second transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers of said portable telephone set when the identification numbers are transferred to said second transceiver circuit;
a second memory for storing the identification numbers;
a second control circuit, coupled to said second memory and said second transceiver circuit, for transferring the identification numbers to said second transceiver circuit and for controlling placing/answering of a call according to the identification numbers stored in said second memory; and adaptor means installed in the vehicle, comprising:
second electrical connection means for connecting to said first electrical connection means, and for outputting an adaptor signal, said first control circuit transferring the identification numbers stored in said first memory to said second memory on receiving the adaptor signal; and wirings to connect to said transceiver unit, said portable telephone set further including means for disabling a power supply to said first control circuit after the identification numbers stored in said first memory are transferred 8a to said second memory.
According to another broad aspect of the invention there is provided a mobile telephone system comprising:
a portable telephone set capable of operating outside a vehicle, said portable telephone set including:
a first memory for storing identification numbers corresponding to said portable telephone set; and a first control circuit, coupled to said first memory, for controlling placing~answering of a call according to the 0 identification numbers;
a transceiver unit for installation in the vehicle, including:
a transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers;
a second memory; and a second control circuit, coupled to said second memory and said transceiver circuit, for controlling placing/answering of a call;
an adaptor for electrically connecting said portable telephone set to said transceiver unit when said portable telephone set is to be used in the vehicle r and for outputting an adaptor signal which causes the first control circuit to transfer the identification numbers stored in said first memory to said second memory, so that said portable telephone set, said transceiver unit and said adaptor unit form a vehicle telephone having the identification numbers corresponding to said portable telephone set, 8b 20260~
said portable telephone set further including means for disabling power supply to said first control circuit after the identification numbers stored in said first memory are transferred to said second memory.
The above-mentioned features and advantages of the present invention, together with other objects and advantages, which will become apparent, will be more fully described hereinafter, with reference being made to the accompanying drawings which form a part thereof, wherein like numerals refer to like parts throughout.
8c DESCRIPTION OF THE PREFERRED EMBODIMENTS
A schematic configuration of a first preferred embodiment of the present invention is shown in Figure 2. A
perspective view of Figure 2 is shown in Figure 3, and a principle block diagram is shown in Figure 4. A portable telephone set 21 comprises: a function ceasing circuit 31;
a first control circuit 32; a first memory 33; a battery 34;
a key board 21-1; a display 21-2 and a plurality of contacts 21-5 for electrically connecting to later-described adaptor 22. Adaptor 22 is installed in a vehicle and has a cradle 22-1 to detachably hold portable telephone set 21 thereon.
Adaptor 22 comprises: at an inner sidewall of cradle 22-1 a plurality of contacts 310 (not shown in Figure 3 but in Figure 8) for contacting the contacts 21-5 when portable telephone set 21 is held thereon; internal wirings for interconnecting the signals to/from a transceiver unit 23 and the signals to/from a control unit 24; and a charging circuit 35 for charging battery 34, and on holding portable telephone set 21 thereon transmits an adaptor signal ADPT to portable telephone set 21. Transceiver unit 23 is installed in the ~J
vehicle and comprises a transceiver circuit 36 which transmits a radio frequency signal of a predetermined frequency and power carrying a transmitting audio AUD/TX
and the identification numbers, etc., i.e. transmitting data DAT/TX, as well as outputs from a received-signal input from a vehicle antenna VHC ANT a received-audio signal AUD/RV and a received-control data DAT/RV; a second memory 37 which stores the identification numbers, etc. as control signals, transferred from portable telephone set 21; and a third control circuit 38. Remote control unit (referred to hereinafter as control unit) 24 is installed in the vehicle and comprises a microphone and an earphone (both denoted with the numeral 41); a handset 28 carrying a keyboard 40;
and a second control circuit 39 for processing the signals input/output to/from the hands~et 28.
Operations of the above system is hereinafter described.
When portable telephone set 21 is installed on adaptor 22, and accordingly, adaptor signal ADPT is received from adaptor 22, first control circuit 32 transfers the data, such as identification numbers, stored in first memory 22 via adaptor 22 to second memory 37, as well as battery 34 i~
charged from charging circuit 35 of adaptor 22. After waiting a predetermined period, such as 10 second after receiving the adaptor signal ADPT, function-ceasing circuit 31 disables a supply of power source voltage to, for example, a transceiver circuit (not shown in Fig. 4, but described later) in portable telephone set 21, while the battery charging is kept on. Operations necessary for a mobile telephone, such as placing/answering a call, are accomplished by the use of the identification numbers stored in second memory 37, of transceiver unit 23 while satisfying the required transmitting power and receiving sensitivity.
Further details of the first preferred embodiment are hereinafter described. An external view and circuit configuration of portable telephone set 21 are schematically illustrated in Fig. 5 and circuit diagram Fig. 6, respectively. In Fig. 6, the portions denoted with * marks, i.e. switches 201 and 221 and wirings connected from these switches to external terminals, are not used for portable telephone set 21 of the first preferred embodiment, but used for the second preferred embodriment to be described later.
Circuit configuration of control unit 24 is shown in Fig. 7, where the second control circuit 39 is surrounded with dotted lines. Circuit configuration of adaptor 22 is shown in Fig. 8, which comprises power switch 301, power switch control circuit 302, charging circuit 303 (denoted with the numeral 35 in Fig. 4~ which determines its charging current, and charge control switch 304. Circuit configuration of transceiver unit 23 is shown in Fig. 9. Mutual connections, via adaptor 22, between portable telephone set 21 installed thereon, transceiver unit 23 and control unit 24 are shown in Fig. 10.
At first, an out-of-vehicle operation of portable telephone set 21 is hereinafter described, in reference to the Fig. 6 configuration of portable telephone set. In Fig.
6, a group of radio frequency circuits denoted with the numerals from 113a (duplexer) to 109 (transmitter synthesizer with modulator) is called a transmitter circuit;
a group of low frequency circuits denoted with the numerals from 108 (summing circuit) to 103 (band-pass filter) is called a transmitting-audio circuit; a group of low frequency circuits denoted with the numerals from 113b (duplexer) to 126 (discriminator)is called a receiver circuit; a group of low frequency circuits denoted with the numerals from 122 (amplifier) to 125 (de-emphasizer) is called a received audio circuit; and a circuit denoted with the numeral from 131 (display)_ to 140 (RAM) is called a digital control circuit. Further details of each of these circuits are hereinafter described.
(1) Transmitter circuit and transmitting-audio circuit.
An audio signal output from microphone 101, passing microphone amplifier 102 and bandpass filter lQ~
(referred to hereinafter as BPF) for allowing a 300 Hz to 3 KHz audio signal to pass, has its dynamic range compressed down to 2:1 by compressor 104, next has its frequency characteristics adjusted to 6 db/octave by pre-emphasiss circuit 105, and next has its maximum frequency deviation limited to below a predetermined level by an instantaneous frequency deviation limiter 106 so that the maximum frequency deviation does not exceed a predetermined level even when a loud voice is talked. Next, the pass-band of the signal is narrowed in splatter filter 107 by suppressing the higher harmonics components of the signal. The signal is then added with the transmittal signal DAT/TX including the above-described identification numbers, etc. by summing circuit 108 so as to generate a modulation signal. The modulation signal directly modulates transmitter synthesizer with modulatlor 109 so as to generate a frequency-modulated ~FM~ signal. This FM signal, via bandpass filter 110, power amplifier 112 and duplexer 113a, is transmitted from antenna ANT. On being pulled up, the antenna ANT operates as an external antenna. When the a~tenna is pushed in, the circuit is automatically switched to connect to an integral antenna by a switch (not seen in the figure).
~2) Receiver circuit and received audio circuit.
A radio frequency signal received by the antenna is input via duplexer 113b, pre-amplifier 133 and BPF 130, to mixer 129. Mixer 12g being also input with the output signal of receiver synthesizer 132 via another BPF 1~1, converts the frequency of the signal input thereto so as to generate an FM intermediate frequency (referred to hereinafter as IF) signal. This FM signal, via internal frequency amplifier 127, is discriminated by frequency 202609~
discriminator 126. Out of the discriminated signal a digital signal and an audio signal are separated. The digital signal is input to control circuit 32 and the audio signal is output, via de-emphsiss circuit 125, BPF 124, expander 123, and audio amplifier 122, to earphone 121.
Power source circuit 150 in portable telephone set 21 generates necessary voltages.
(3) Digital control circuit.
Identification numbers of the portable telephone set 21, such as own mobile identification numbers, the manufacturer's code number, the apparatus serial number and mobile identification number, which are legally required for placing/answering a call for position registration, and for zone switching, has been written in ROM (read only memory) 139 in advance. When the power switch is closed, the data in ROM 139 is loaded to RAM 140 by a CPU (central processing unit) 135 according to a program installed in ROM 139 in advance. Furthermore, as many as several tens of phone numbers which have been input by a memory dialing function or a phone number of the last-number re-dialing function, etc. have been stored in RAM 140. Contents of the data are shown in Fig. 11, as an example. According to the data in RAM 140, CPU 135 carries out the controls of: (a) answering a call; (b) placing a call; (c) position registration; (d) ~one switching during a call; and (e) ending a call.
Operation of the digital control circuit of the portable 202609~
telephone set 21 rested on adaptor 22 will be described later.
(a) Control to answer a call.
Digital signals, i.e. the received data DAT/RV
separated from the above-mentioned demodulated signal, is decoded by decoder 137. Errors in the decoded signal are corrected by error correction circuit 136. The corrected signal is checked via I/O control circuit 134 by CPU 135 whether the received data is of the own telephone number.
If it is the own number, CPU 135 instructs data generation circuit 138 to generate transmitting data DAT/TX necessary for connecting to a channel instructed by the base station.
Thus, the transmitting data is responded with an acknowledge signal to the base station so as to establish the channel connection.
(b) Control to place a call.
In placing a call, the opposite party's telephone number dialed into keyboard 132 is processed by sub CPU 133, and is input via I/O control circuit 134 (whose function is described later) to main CPU 135, which then instructs, via I/O control circuit 134, data generator 138 to match own telephone number with the opposite party's control signal, such as identification numbers, etc., so as to generate transmitting data DAT/TX. Transmitting data DAT/TX input to summing circuit 108 as described above is transmitted out to the base station.
202609~
(c) Control to register the position.
Zone information indicating the current zone is constantly transmitted from each base station; therefore the mobile station, i.e. portable telephone set, compares the received information with the zone information of the home zone where the portable telephone is registered to so as to recognize whether the mobile station is currently located in the home zone. On moving into the adjacent zone, the portable telephone, which receives adjacent zone's information different from that of the home zone, transmits to the base station the own telephone number, which is then confirmed by an acknowledge signal from the base station, so as to renew the own number registration thereto.
{d) Control to switch the zone while talking.
When a base statio~, which is constantly watching the electric field intensity of the signals sent from each mobile station, detects a decrease in the electric field intensity of the mobile station, the base station sends the detected results to the central control station which controls all the base stations in its control zone. The control station then requests all the base stations in the control zone to watch their receiving signal levels, so as to find and switch to the zone which the mobile station is to move into, according to the watched data.
(e) Control to end a call.
Disconnect the speech channel connected with the 202609~
base station, when the talk is finished.
(f) Other controls.
A display 131 displays the calling number or the status of the telephone, such as a busy state. I/O
controller 134 carries out an interface between sub-CPU 133, data correction circuit 136 and data generation circuit 138.
For the communication between the base station and the mobile station for the above-described controls, only the necessary data are read out of the data written in RAM 140, and are sent out in a predetermined format, as typically shown in Fig. 11, to the base station.
Operation of the portable telephone set 21 installed on adaptor 22 in a vehicle is hereinafter described. When portable telephone set 21 is rested on adaptor 22, a micro switch 304 detecting the e~istence of portable telephone set 21 is closed to supply a power source voltage so that adaptor 22 transmits an adaptor signal ADPT to portable telephone set 21. On receiving the adaptor signal ADPT, first control circuit 32 transfers the data, such as the identification numbers, etc., stored in RAM 140 (33~, via adaptor 22 to the second RAM 240 in transceiver unit 23, as an up-link data DAT/UP. After waiting a period, for example, 10 s preset in timer 152 after completion of the data transfer, the supply of power source voltage to, for e~ample, the transmitter circuit of portable telephone set 21 is discontinued so as to disable the function as a 202609~
portable telephone set 21. The data transfer and the power supply discontinuation are instructed by CPU 135 in first control circuit 32 according to the program in ROM 139.
Function-ceasing circuit 31 shown in Fig. 4, i.e. timer 152 shown in Fig. 6, is composed of this operation of CPU 135 according to the program. A flow chart of these operations are shown in Figs. 12. Operation of the charging circuit is described later in detail in the description of adaptor 22.
If a new telephone number is input for a memory call ~ria control unit 22 to the second RAM 240, this number is also input to first RAM 140 by CPU 235 and CPU 135, so that the newly input telephone number can be used for a memory call from portable telephone set 21 e~en after portable telephone set 21 is taken out of the vehicle.
Circuit configuration of transceiver unit 23 shown in Fig. 9 is basically identical to that of portable telephone set 21 shown in Fig. 6, except that the transmitting power is 3 W, there is none of handset, keyboard, display, earphone, microphone, charging circuit nor battery, and the way of using the RAMs which store the identi~ication numbers, etc.. Therefore, the corresponding circuits are denoted with the numerals having the same last-two digits.
Operation of transceiver unit 23 is hereinafter described:
(1) Transmitter circuit and transmitting-audio circuit.
Transmitting-audio signal AUD/TX output from handset 28 of control unit 24 goes via adaptor 22 to microphone amplifier 202, bandpass filter (BPF) 203, and compressor 204 where the dynamic range is compressed to 2:1, and further goes to pre-emphasiss circuit 205, instantaneous frequency deviation limiting circuit 206 and splatter filter 207, so as to compress its harmonic components and to limit the bandwidth. Output from splatter filter 207 is added with transmitting data DAT/TX including the above-described identification numbers by su~ning circuit 208. The added signal is input, as an modulation signal, to transmitter synthesizer with modulator 209, which then outputs an FM
signal. The FM signal is output, via BPF 210, power amplifier 212 and duplexer 213, to vehicular antenna VHC
ANT, so as to transmit, for example, 3 watt radio frequency power.
(2) Receiver circuit and received-audio circuit.
Received radio frequency signal goes to duplexer 213b and pre-amplifier 233, and is input via BPF 229 to mixer 299, to which the output of receiver synthesizer 232 is also input. Frequencies of thus input signals are converted therein to output an FM IF signal. This FM IF signal passing through BPF 228 is amplified by IF amplifier 227.
The amplified signal is discriminated by FM discriminator 226, an output of which is separated into a analog signal and a digital signal. The analog signal is sent via de-emphasiss eireuit 225, BPF 224 and expander 223 to audioamplifier 222, from whieh reeeived-audio signal AUD/RV is output so as to input to earphone 186 of handset 28 of eontrol unit 24.
~3) Control eircuit.
Digital signal, i.e. reeeived data signal DAT/RV, output from frequeney diseriminator 226 is input to data deeoder 237 and then to error eorreetor 236, from whieh eorreeted data is output. Main CPU 235 eheeks the data via I/O eontroller 234 whether the data is of the own telephone number stored in RAM 240. If it is true, CPU 235 executes the proeedure neeessary for the mobile telephone in response to the eontrol of the base station in the same way as that deseried for the portable telephone. In plaeing a call, CPU
235 e~ecutes the procedure neeessary for plaeing a eall according to an up-link data DAT/UP (which is described later) dialed in eontrol unit 24 and the data transferred from portable telephone set 21 and now stored in RAM 240.
Deseription about ROM 239 is given later.
(4) Power supply circuit.
When a power supply switch 188 in control unit 24 is manually activated and the ignition sense line is also activated by an ignition switch or an aecessory switch of the vehicle, power switch 250 in transceiver unit 23 is activated so as to deliver the power supply voltage from a vehicle battery (shown in Fig. 10) to the circuits in transceiver unit 23 and to control unit 24 via adaptor 22.
In adaptor 22 whose circuit configuration is shown in Fig. 8, charge control switch 304 is formed of a micro switch, which is actuated by portable telephone set 21 resting on adaptor 22 so as to become conductive. Driven by the output of charge control switch 304 and ignition sense line, power switch control circuit 302 enables power switch 301 to deliver the vehicle battery voltage via charging circuit 303 to battery 151 in portable telephone set 21, so that battery 151 is charged. Charging circuit 303 determines the charging current as well as detects completion of the charge.
Thus, control unit 24, adaptor 22 and transceiver unit 23 together can also function as an independent vehicle telephone having no portable telephone set adapted thereto as well as an adaptor system for a portable telephone set.
Therefore, identification numbers, etc. registered to this independent vehicle telephone may be written in ROM 239 in advance. Then, according to the data loaded in RAM 240 from ROM 239 the operations to place/answer a call are executed in the same way as the above-described preferred embodiment.
Moreover, for the case where portable telephone set 21 is adaptable to the vehicle telephone, CPU 235 may be programmed in ad~ance so that the vehicle telephone can place/answer a call according to the multiple phone numbers stored in RAM 240, i.e. of the vehicle telephone and portable telephone. Then, the owner of the portable telephone will never miss a call for either phone number while he is in the vehicle.
Control unit 24 may further have a speaker unit 29 and a hand-free microphone 30, for allowing hand-free talking without picking up handset 28.
The system configurations according to the above-described preferred embodiments is advantageous in the following effects:
(1~ Vehicle telephone system according to the above preferred embodiments can be available at a less expensive cost than the Fig. 1 power booster/pre-amplifier system which must be produced in relatively small quantity, because transceiver 23 is produced in a very large quantity for the popular vehicle telephone systems even though more complex circuitry is employed therein than prior art power booster/pre-amplifier 13.
(2) The function to transfer the identification numbers is additionally required to the portable telephone set; however, this addition can be done by a simple addition of the program, causing no increase in the production cost.
(3~ Control unit, the hand set, being also produced in a very large quantity for vehicle telephones can be inexpensive as well as excellent in its handling in the vehicle.
~ 4) Adaptor 2 is simpler and smaller, accordingly less expensive, than that of the prior art which requires a radio frequency coupler.
~ 5) Only a small investment in an inexpensive adaptor 22 allows one who already has a vehicle telephone to use a portable telephone in the vehicle.
~ 6) One who already has a portable telephone can also purchase a vehicle telephone at a cost equal to or less than the cost for purchasing the Fig. 1 prior art system which is considerably expensive.
A second preferred embodiment of the present invention is hereinafter described in reference to a schematic configuration Fig. 13, and a perspective view Fig. 14 and a principle block diagram Fig. 15. In the second preferred embodiment, the key board 25-1, display 25-2, microphone 25-3 and earphone 25-4, of porctable telephone set 25 are utilized in place of control unit 24 of the first preferred embodiment. An adaptor 26 is formed of an adaptor unit 262 and a holder 261 hung typically on a wall or dash board of the vehicle so as to just mechanically hang portable telephone set 25 as shown in Fig. 14, where portable telephone set 25 is now picked up from holder 261. Adaptor unit 262 relays electrical connections between portable telephone set 25 and transceiver unit 23, by means of cables 263 and 264, each having a plurality of wirings. That is, instead of exposed contacts 25-1 of the first preferred embodiment, the electrical connections between portable telephone set 25 and adaptor unit 262 are carried out by cable 264, an end of which has a modular jack to be detachably inserted into a socket (not seen in Fig. 14~
provided at the bottom end of portable telephone set 25.
Circuit configuration of portable telephone set 25 is shown in Fig. 6 where the * marked portions, which are not used in the first preferred embodiment, are used now. When the modular jack is inserted to the socket, an adaptor signal ADPT carried by one of the wirings of cable 264 is input to I/O control circuit 134 of portable telephone set 25, whereby the identification numbers, and other information, stored in RAM 140 is transferred via adaptor unit 262 to RAM
240 of transceiver unit 23 in the same way as the first preferred embodiment, and after waiting a period predetermincd by timer 15 (152~ power supply voltage to, for example, transmitting circuit of portable telephone set 25 is disabled; further more, switches 201 and 221 disconnect microphone 101 and its amplifier 102 and earphone 121 and its amplifier 220 from respective amplifiers 103 and 122, so as to connect to the wirings of cable 264, each denoted with AUD/TX and AUD/RV in Fig. 6. On and after these operations, the power voltage supply is kept on to charge battery 151 in the same way as the first preferred embodiment. Internal circuit of adaptor unit 262 is shown in Fig. 17, where charging circuit 35 and the related circuits are identical to those of the first preferred embodiment. Up-link/down-link control circuit 30' controls connections of the signalsbetween portable telephone set 25 and transceiver unit 23.
In placing/answering a call, portable telephone set 25 is picked up from holder 261 so as to be used as control unit 24 of the first preferred embodiment. That is, the telephone number to call is input to key board 25-1 of portable telephone set 25. The input number is processed by sub CPU 133, and then input via I/O control circuit 134 and data generator circuit 138 to transceiver unit 34, where the procedure for placing the call may be carried out according to the memory-dial numbers and the identification data stored in RAM 240 of transceiver unit 23. These operations initiated by adaptor signal are executed by the first control circuit 32 according to a program installed in ROM
139 in advance in the same way~as the first preferred embodiment. Voice talk is carried out with microphone 101 and earphone 121 (Fig. 6), both of portable telephone set 25, whose voice signals are sent/received via adaptor unit 262 to/from trans~eiver llnit 23. After portable telephone set 25 is picked up from holder 261, a hook key of the keyboard is pushed so as to transmit a hook signal HOO~ via adaptor unit 262 to transceiver unit 23, or a micro switch (not shown in figures~ may be provided on holder 261 so as to detect the existence of portable telephone set held in holder 261 and generate the hook signal HOOK when portable telephone set 25 is removed fr-om holder 261. Cable 264 may , 24 202609~
be detachably connected to adaptor unit 262 by means of plug and socket (not shown in the figures~, where the plug may actuate a micro switch (not seen in the figure~ provided in adaptor 262 so as to generate adaptor signal ADPT. Circuit configuration and operation of transceiver unit 23 are identical to those of the first preferred embodiment, as shown in Fig. 9. Flow chart of the above-described operations are shown in Figs. 18.
The system configuration according to the above second preferred embodiment is advantageous in items (1~, (2) and (4~ of the effects of the above first preferred embodiment.
As for effect (3~, the portable telephone set being used as a handset and held in the holder when not in use, is advantageous in its easy handling in the vehicle. As a result of all, owing to the e~ployment of inexpensive additional components, there can achieve a system superior in cost, compactness a.nd system expandability to the Fig. 1 prior art system.
Though in the a.bove first preferred embodiment the electrical connections between the portable telephone set and the vehicular adaptor are accomplished by the automatic conta.ct between contacts respectively provided exposingly upon a side of each body when the portable telephone set is placed on the adaptor, it is apparent that this contact connection may be replaced with the detachable connection performed by the cable, jack and socket as described in the second preferred embodiment.
Though in the above preferred embodiments, on receiving the adaptor signal the portable telephone set disables the transmitting circuit, the purpose of this operation is to disable the portable telephone set so as to be a device for placing a call; therefore, one or some of the circuits, such as the transmitter circuit; the receiver circuit, the first control circuit and the audio frequency circuit, may be disabled in order to achieve the purpose. The circuit(s) to be disabled is determined depending on an optional function which is not described in the description of the above preferred embodiments. Therefore, as long as any means to protcct portable telephone set from unexpected erroneous operation is satisfactorily provided, it is not always necessary to disable the circ~it(s).
Though in the above description of the second preferred embodiment switches 201 and 221 are provided in portable telephone set 25, these switches are not always necessary, i.e. amplifiers 102 and 220 may be always connected respectively to BPF 103 and amplifier 122 and corresponding one of cables 263, as long as the voice routes via BPF 103 and via amplifier 122 can -be disabled so that the voices from/to microphone 101/earphone 121 do not disturb or are not disturbed by these routes. In other words, the switches may be omitted if the power source voltage supply to audio circuits in the transmitting circuit and the receiving circuit can be disabled.
Though the above description for the preferred embodiments are given for the case where the power switch of the portable telephone set has been already conductive when the portable telephone set is connected to the adaptor, if the power switch is then non-conductive, the adaptor signal ADPT actuates the power switch to be conductive and then initiates the transfer of the identification numbers to the transceiver unit.
Though in the description of the preferred embodiments the identification numbers are transferred from the RAM in the portable telephone set because RAM is faster than ROM, it is apparent that the identification numbers may be transferred from ROM of the portable telephone set.
The many features and adva~ntages of the invention are apparent from the detailed specification and thus, it is intended by the appended claims to cover all such features and advantages of the methods which fall within the true spirit and scope of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not detailed to limit the invention and ac~ordingly, all suitable modifications are equivalents ma.y be resorted to, falling within the scope of the invention.
Claims (2)
1. A mobile telephone system comprising:
a portable telephone set capable of operating outside a vehicle, including:
a keyboard;
a microphone;
an earphone;
a battery;
a first memory for storing identification numbers registered to said portable telephone set;
a first transceiver circuit including a transmitter circuit and a receiver circuit, said first transceiver circuit receiving and transmitting a radio frequency wave carrying voice signals and the identification numbers;
a first control circuit, coupled to said first memory, for controlling placing/answering of a call according to the identification numbers stored in said first memory; and first electrical connection means;
a transceiver unit installed in the vehicle, including:
a second transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers of said portable telephone set when the identification numbers are transferred to said second transceiver circuit;
a second memory for storing the identification numbers;
a second control circuit, coupled to said second memory and said second transceiver circuit, for transferring the identification numbers to said second transceiver circuit and for controlling placing/answering of a call according to the identification numbers stored in said second memory; and adaptor means installed in the vehicle, comprising:
second electrical connection means for connecting to said first electrical connection means, and for outputting an adaptor signal, said first control circuit transferring the identification numbers stored in said first memory to said second memory on receiving the adaptor signal; and wirings to connect to said transceiver unit, said portable telephone set further including means for disabling a power supply to said first control circuit after the identification numbers stored in said first memory are transferred to said second memory.
a portable telephone set capable of operating outside a vehicle, including:
a keyboard;
a microphone;
an earphone;
a battery;
a first memory for storing identification numbers registered to said portable telephone set;
a first transceiver circuit including a transmitter circuit and a receiver circuit, said first transceiver circuit receiving and transmitting a radio frequency wave carrying voice signals and the identification numbers;
a first control circuit, coupled to said first memory, for controlling placing/answering of a call according to the identification numbers stored in said first memory; and first electrical connection means;
a transceiver unit installed in the vehicle, including:
a second transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers of said portable telephone set when the identification numbers are transferred to said second transceiver circuit;
a second memory for storing the identification numbers;
a second control circuit, coupled to said second memory and said second transceiver circuit, for transferring the identification numbers to said second transceiver circuit and for controlling placing/answering of a call according to the identification numbers stored in said second memory; and adaptor means installed in the vehicle, comprising:
second electrical connection means for connecting to said first electrical connection means, and for outputting an adaptor signal, said first control circuit transferring the identification numbers stored in said first memory to said second memory on receiving the adaptor signal; and wirings to connect to said transceiver unit, said portable telephone set further including means for disabling a power supply to said first control circuit after the identification numbers stored in said first memory are transferred to said second memory.
2. A mobile telephone system comprising:
a portable telephone set capable of operating outside a vehicle, said portable telephone set including:
a first memory for storing identification numbers corresponding to said portable telephone set; and a first control circuit, coupled to said first memory, for controlling placing/answering of a call according to the identification numbers;
a transceiver unit for installation in the vehicle, including:
a transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers;
a second memory; and a second control circuit, coupled to said second memory and said transceiver circuit, for controlling placing/answering of a call;
an adaptor for electrically connecting said portable telephone set to said transceiver unit when said portable telephone set is to be used in the vehicle, and for outputting an adaptor signal which causes the first control circuit to transfer the identification numbers stored in said first memory to said second memory, so that said portable telephone set, said transceiver unit and said adaptor unit form a vehicle telephone having the identification numbers corresponding to said portable telephone set, said portable telephone set further including means for disabling power supply to said first control circuit after the identification numbers stored in said first memory are transferred to said second memory.
a portable telephone set capable of operating outside a vehicle, said portable telephone set including:
a first memory for storing identification numbers corresponding to said portable telephone set; and a first control circuit, coupled to said first memory, for controlling placing/answering of a call according to the identification numbers;
a transceiver unit for installation in the vehicle, including:
a transceiver circuit for outputting a radio frequency signal carrying a voice signal and the identification numbers;
a second memory; and a second control circuit, coupled to said second memory and said transceiver circuit, for controlling placing/answering of a call;
an adaptor for electrically connecting said portable telephone set to said transceiver unit when said portable telephone set is to be used in the vehicle, and for outputting an adaptor signal which causes the first control circuit to transfer the identification numbers stored in said first memory to said second memory, so that said portable telephone set, said transceiver unit and said adaptor unit form a vehicle telephone having the identification numbers corresponding to said portable telephone set, said portable telephone set further including means for disabling power supply to said first control circuit after the identification numbers stored in said first memory are transferred to said second memory.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1248648A JPH03109829A (en) | 1989-09-25 | 1989-09-25 | On-vehicle adaptor system for portable telephone set |
| JP1-248648 | 1989-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2026093A1 CA2026093A1 (en) | 1991-03-26 |
| CA2026093C true CA2026093C (en) | 1995-06-20 |
Family
ID=17181250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002026093A Expired - Fee Related CA2026093C (en) | 1989-09-25 | 1990-09-24 | Mobile telephone system capable of adapting a portable telephone set |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5659594A (en) |
| JP (1) | JPH03109829A (en) |
| CA (1) | CA2026093C (en) |
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-
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- 1989-09-25 JP JP1248648A patent/JPH03109829A/en active Pending
-
1990
- 1990-09-24 CA CA002026093A patent/CA2026093C/en not_active Expired - Fee Related
-
1995
- 1995-02-15 US US08/390,280 patent/US5659594A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5659594A (en) | 1997-08-19 |
| CA2026093A1 (en) | 1991-03-26 |
| JPH03109829A (en) | 1991-05-09 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |