CA1315343C - Radio telephone apparatus - Google Patents
Radio telephone apparatusInfo
- Publication number
- CA1315343C CA1315343C CA000592356A CA592356A CA1315343C CA 1315343 C CA1315343 C CA 1315343C CA 000592356 A CA000592356 A CA 000592356A CA 592356 A CA592356 A CA 592356A CA 1315343 C CA1315343 C CA 1315343C
- Authority
- CA
- Canada
- Prior art keywords
- terminal
- connector
- unit
- duplexer
- portable unit
- 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
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
-
- 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
- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
Abstract
RADIO TELEPHONE APPARATUS
ABSTRACT OF THE DISCLOSURE
A portable telephone apparatus which is capable of being selec-tively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control sig-nal. The telephone apparatus includes an amplifier for amplifying the RF signal by a predetermined amplification factor and an antenna for radiating the amplified RF signal. An operator actuatable switch is coupled to the output of the amplifier and is selectively coupled to the antenna and the adaptor unit. A control device is coupled to the ampli-fier and the operator actuatable switch and is responsive to the level control signal for controlling the amplifier so that the amplification factor of the amplifier is fixed to a predetermined level when the oper-ator actuatable switch is in a first state and to a variable level when the actuatable switch is in a second state.
ABSTRACT OF THE DISCLOSURE
A portable telephone apparatus which is capable of being selec-tively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control sig-nal. The telephone apparatus includes an amplifier for amplifying the RF signal by a predetermined amplification factor and an antenna for radiating the amplified RF signal. An operator actuatable switch is coupled to the output of the amplifier and is selectively coupled to the antenna and the adaptor unit. A control device is coupled to the ampli-fier and the operator actuatable switch and is responsive to the level control signal for controlling the amplifier so that the amplification factor of the amplifier is fixed to a predetermined level when the oper-ator actuatable switch is in a first state and to a variable level when the actuatable switch is in a second state.
Description
~3~3l~3 RaDIo T~L~P~ON~ ~PPARAT~S
This application is related by subject matter to copending Canadian ~pplication Serial No~ 578,508 entitled RADIO TELEPHONE APPARATUS ~iled September 27, 1988.
FIELD OF TH~ INVENTION
This invention relates to the field of radio telephona apparatus for transmitting signals over a selected radio channel and, more particularly, to an improved radio telephone apparatus which includes a portabl~ unit and an adaptor unit.
BAC~G~OU~D OE THE INV~MTIO~
Mobile radio telephones are known as radio telephone apparatus and are usad in vehicles such as automobiles. In an automobile telephone, a dial signal and a speech signal are input at a handset unit disposed near the seat of the automobile. These signals are transmitted from a transceiver unit, installed for example, in the trunk of the automobile, to a base station through which a communication link with a remote land line telephone or a remote radio telephone is established. In such a conventional automobile radio telephone apparatus, the handse!t unit near the automobile seat cannot be disconnected from the transceiver unit in the trunk. Thus, a user cannot use the apparatus outside the automobile.
The above-noted problems associated with prior art radio telephones are addressed by the radio telephone apparatus described and claimed in Application Serial 30 No. 578,508 m~ntioned above. The radio telephone described therein can be used inside or outside an automobile. Fig. 1 is a perspective view of such a radio telephone apparatus. The radio telephone apparatus comprises a portable unit 101 with an antenna 35 102 and an adaptor unit 103. Portable unit 101 and adaptor unit 103 are connected to each other by a coaxial cable 104. Adaptor unit 103 is supplied with power from a car battery (not shown) through a power cable 106 and is connected to an antenna 105 which is disposed outside the automobile. In accordance with the construction of the radio telephone apparatus, both portable unit 10l and adap70r unit 103 are equipped with a radio transmit/receiver circuitry. Thus, a user may communicate with another person by using portable unit 101 also or by using portable unit 101 attached to adaptor unit 103.
Fig. 2 is a block diagram of the radio circuitry which Applicants have found may be used in the radio telephone apparatus shown in Fig. 1. In the event that only portable unit 101 is available to the user, the output of power amplifier (PA) 106 is connected via switch 111 to antenna 102 which is provided on portable unit 101. The control and speech signals generated by signal source lO7 are thus amplified by PA 106 and then transmitted via antenna 102. The amplification factor of PA 106 is determined by automatic power control circuit (APC~ 108.
APC 108 determines the amplification factor in response to a level control signal received by level control signal receiver 112 from a base station (not shown) and a feedback signal provided from the output of PA 106. APC 108 provide a control signal which establishes the ampli-fication factor of PA 106.
In the event that adapter unit 103 is available to the user along with portable unit 101, the output of PA 106 is connected to the input of power amplifier (PA) 109 via switch 111. Thus, signals generated by signal source 107 are amplified by PA 106 and PA 109 and then trans-mitted via antenna 105. In this configuration, APC 108 controls PA 106 in response to the level control signal and the feedback signal. Also, an automatic power control circuit (APC) 110 in adaptor unit 103 controls PA 109 in response to a level control sigral received by level control signal receiver 114 from the base station (not shown) and a feedback signal provided from an output of PA 109.
Though the radio telephone apparatus illustrated in Fig. 2 repre-sents a substantial improvement over such apparatus known in the prior art, it remains deficient in a rumber of respects. One such defi-ciency is that it is difficult to control the power level of the final amplifi~er stage, i.e., the output level of PA 109. This is because the ~3~53~
input level to PA 109, i.e., the output level of PA 106, fluctuates in response to the control signal provided from APC 108.
SUMMARY OF_THE INVENTION
It is accordingly an object of an aspect of the present invention to provide an improved radio telephone apparatus including a portable unit and an adaptor unit in which transmission power level can be readily controlled.
It is an object of an aspect of the present invention to provide a portable unit capable of being attached to an adaptor unit wherein the output power level of the radio circuitry in the portable unit is stable.
Variou~ aspects of the invention are as follows:
A radio telephone apparatus comprising a portabla unit, an adaptor unit mounted in a vehicle and connectable to the portable unit through a cable, and a vehicle antenna provided on the vehicle, wherein.
the portable unit includes:
a signal source for generating transmission signals to be transmitted;
modulator meanC connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for providing the first amplification factor;
a portable antenna for receiving and transmitting radio fre~uency signals;
first terminal connected to the portable antenna;
13153~3 3a second terminal connected to a connector of the portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first 0 duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and switching means for selectively connecting the third terminal to either one of the first terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptor unit;
second amplifying means connected to the second duplexer means for amplifying the transmission signals from the seeond duplexer means on the basis of a se~ond 5 amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control 0 signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the vehicle antenna to the second duplexer means and applying th~ tran~mission signals amplified by the second amplifying means to the vehicle antenna; and ~31 '~3~3 3b the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and tha adaptcr unit for transmi.tting the transmission and reception signals.
A radio telephone apparatus comprising a portable unit, an adaptor unit connectable to the portable unit through a cable, and a first antenna associated with the adaptor unit, wherein:
the portable unit includesO
a signal source of generating transmission signals to be transmitted;
modulator means connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for p:roviding the first 0 amplification factor;
second antenna for receiv.ing and transmitting radio frequency signals;
first terminal connected to the second antenna;
second terminal connected to a connector of the 5 portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and ~3~3~
3c switching means for selectively connecting the third terminal to either one of tha Eirst terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptox unit;
second amplifying means connscted to the second lQ duplexer means for amplifying the transmission signals from the second duplexer means on the basis of a second amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the first antenna to the second duplexer means and applying the transmission signals amplified by the second amplifying means to the vehicle antenna; and the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and the adaptor unit for transmitting the transmission and reception signals.
By way of added explanation, in achieving these objects, as embodies and described herein, the invention ~It~
3d includes a portable radio telephone apparatus capable of heing selectively connected to an adaptor unit for transmitting a radio frequency signal a~ a certain power level responsive to a level control signal~ The apparatus includes an amplifier for amplifying the radio frequency signal by a predetermined amplification factor and an antenna for radiating the amplified radio frequency æignal. An operator actuatable switch is coupled to an output of the amplifier and is selectively coupled to the antenna and to an adaptor unit for applyiny the output signals of the amplifier to either the antenna or adaptor unit. A control device is coupled to the amplifier and the operator actuatable ~witch and is responsive to the level control signal for controlling the amplifier so that the amplification Pactor of the amplifier is fixed to a predetermined level when the operator actuatable switch is in a first state. The amplification factor of the amplifier is variable in response to the level control signal when the operator actuatable switch is in a second state.
The problems and deficiencies of other radio telephone apparatus discussed above are solved by the principles of the present invelltion. In this invention, responsive to an actuation of the operator actuatable switch, an amplification ~actor to be provided to the ampli~ier in the portable unit is fixed at a predetermined valueO Accordingly, the output power level of the ~mplifier becomes stable without fluctuating in response to a level control signal or a feedback signal. Therefore, in the event that the portable unit is connected to the 13:~5343 adaptor uni~. the ou~put power level of the adaptor unit can be accu-rately controlled in response to the level control signal.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a p~ive view of a ra~io te1e.~orle disc1Osed in ~ng Canadian Application Serial No. 57~,50~;
Figure 2 is a block diagram of the radio circuitry used in the radio telephone apparatus shown in Fig. l;
Figure 3 is a schematic block diagram of a radio transmission circuit used in a radio telephone apparatus in accordance with an embodiment of the present invention;
Figure ~ is a schematic diagram of automatic power control cir-cuit 305 shown in Fig. 3;
Figure 5 is a structural diagram of switching circuit 303 shown in Fig. 3;
Figure 6 is a block diagram of a mobile telephone in accordance with another embodiment of the present invention;
Figures 7(a) and (b) are structural diagrams of switch circuit 611 shown in Fig. 6;
Figure ~ is a block diagram of transmitter 606 shown in Fig. 6.
DETAILED DESCRIPTION OF THE PRE]FERRED ElIIE~OO~MENT
~ preferred embodiment of the present invention will be describe~ with reference to the accompanying drawings.
~ igure 3 is a block diagram of a radio transmission circuit used in a radio telephone apparatus according to one embodiment of the present invention. In Fig. 3, an antenna 301 is capable of being extended to increase its length for use or collapsed for storage when not in use. Such an antenna may be selected from among those known in the art as telescoping antennas. When antenna 301 is extended, the output of a power amplifier (PA~ 302 is connected tc antenna 301 by a switching circuit 303. Control and speech signals to be transmitted are provided from signal source circuit 304 in the form of radio frequency (RF) signals and are radiated from an~enna 301 after being amplified by PA 302. A portion of the output signal from PA 302 is coupled to an automatic power control circuit (APC) 305 as a feed back signal. ~lso, switching circuit 303 sends a detection signal (an on state signal) 13~3~3 indicative of the extension of antenna 301 to APC 305 via a control circuit 306. Responsive to the cletection signal, APC 3Q5 controls PA
30~ so that the amplification factor of PA 302 is variable In response to a level control signal. PA 302 changes it's amplification factor in response to the level of the control signal provided from APC 305. The level control signal is transmitted from a base station and is received by a radio reception circuit 314 and is provided to APC 305 via control circuit 306.
Fig. 4 is a schematic diagram of APC 305. The level control sig-nal is compared to the feedback signal by a comparator circuit 401.
When an~enna 301 is extended, switching circuit 402 switches to the B
position so that the output of comparator circuit 401 is applied to PA
302 as the control signal.
Thus, by extending antenna 301, portable unit 30û is able to transmit an RF signal without the adaptor unit which has a magnitude responsive to the level control signal. It should be noted that the swi~ching opera~ion in switching circuit 303 IFig. 3) and switching ci~
cuit 402 (Fig. 4) depends on the extension of antenna 301 provided at portable unit 300, not on the connection between portable unit 300 and adaptor unit 307. Therefore, it is no~ nece~sary in this inven~ion to detect a connection between portable unit 300 and adaptor unit 307.
Thus, circuitry for detecting the connected relationship is not needed.
Referring to Fig. 3 again, when antenna 301 is collapsed, th output of PA 3û2 is coupled to an output terminal 308. Output terminal 308 is coupled to an input terminal 309 which is connected to power amplifier (PA~ 310 of adaptor unit 30~ through coa~ial cable 311.
Accordingly, the output signals from PA 302 are applied to the input of PA 310. The applied signals are radiated from antenna 312 after being amplified by PA 31n. A portion of the outpu~ signal from PA 310 is supplied to an automatic power control circuit (APC3 313 as a feedback signal. Also, switching circuit 303 sends a detection signal (an o~f state signal) indicative of the collapsed state of antenna 301 to APC 305 via control eircuit 306. Responsive to the detection signal, A~C 305 con-trols PA 302 so that the amplification factor of PA 302 is fixed to a predetermined level.
13~ ~3~3 Referring to Fig. 4 again, resporlsive to the detecting signal (an off state signal), switching circuit 402 changes to the a position so that a predetermined voltage level, which is provided trom a power supply voltage Vs divided by resistors 403 and 404, is applied to PA 302. The amplification factor of PA 302 is thus fixed to a predetermined level.
The level is set at a predetermined level so that PA 310 in adaptor unit 7 is appropriately driven.
The level control signal provided from control circuit 306 also is applied to ~PC 313. In APC 313, the level control signal is compared with the feed back signal from the output OI PA 310 by a comparator circuit 314. An output of comparator circuit 314 is applied to PA 310.
Thus, by collapsing antenna 301, an RF signal is amplified at a predetermined amplification level in portable unit 300. The amplified RF si~,nal is coupled to adaptor unit 30~ and further amplified by an amplification factor responsive to the level control signal in adaptor unit 307.
Fig. 5 is a structural diagram of switching circuit 303 showrl in Fig. 3. A hole 501 is provided in portable unit 300 to accommodate antenna 301. At a side wall of hole 501, two switch elements 502 and 503 are provided so as to be pushed aside when antenna 301 is accom-modated in hole 501. One end of swit~h element 502 is connected to the output of PA 302. A line 504 is connected from antenna 301 on one end of switch element 502 when antenna 301 is extended. When antenna 301 is accommodated in hole 501, switch element 502is pushed aside and then the other end of switch element 502 is connectsd to the input of PA 310. Switch element S03 is used for generating the detec-tion signal indicative of the state of antenna 301.
If antenna 301 is extended, the detection signal is maintained at a high logic level since signal line 505 is pulled to a high voltage level by power supply voltage Vs since it is not in contact with switch ele-ment 503. I~ antenna 301 is accomrnodated in hole 501, the detection signai is maintained at a low level since signal line 505 contacts one end of switch element 503 and the other end o~ switch element 503 is connected to ground.
~3:L~3~3 Another embodiment of the present invantion relating to a mobile telephone includes a portable unit and an adaptor unit will be described. Fig. 6 is a block diagram showing the arrangement of the mobile telephone according to this embodiment.
~ portable unit 5 comprises an antenna 66, a duplexer 609, a receiver 607, a transmitter 606, a synthesizer 608, a voice circuit 601, a controi circuit 602, a power controller 603, a battery 64, a speaker 62, a microphone 63, switch circuits 605, 610, and 611, a connection terminal 6~ and a cable connector 604.
An adaptor unit ? comprises a booster unit 700, a voice circuit 701, a power controller 702, a control circuit 703, an antenna 9, a loud-speaker 74, a microphone 75, a power switch ~6, a connection terminal 73, a cable connector ?04, and a battery connector 710. Booster unit 700 comprises duplexers 705 and 706, a reception amplifier ?07, a transmission power ampli~ier 708, and an automatic power control cir-cuit (APC) 709. A car battery 9 is connected to battery connector 710.
Portable unit 6 is connected to adaptor unit 7 via a coaxial cable 8 connected to cable connectors 604 and ?04. A~so~ portable unit 6 is directly connected to adaptor unit 7 through connection terminals 6l and 73.
Fig. ~(a) and Fig. 7(b) are structural diagrams of switch circuit 611 in portable unit 6. Referring to Fi~. 7~a), a strip line iS provided at an inside surface 612a of switch 612. A terminal 611a is connected to duplexer 609. A terminal 611b is connected to antenna 6b. A terminal 611c is connected to adaptor unit 7 through coaxial cable 8. If switch 612 is moved to the high position in Fig. 7(a), terminal 611a is con-nected to terminal 611b ~hrough the strip line. Accordingly, duplexer 609 is coupled to antenna 66. If switch 612is moved to the low position in Fig. 7(a~, terminal 611a is connected to terminal 611c through the strip line. Accordingly? duplexer 609 is coupled to duplexer 706 in adaptor unit i? through coaxial cable 8. The transmission line between antenna 66 and duplexer 609, or between duplexer ?06 and duplexer 609, is formed of a strip line ahd a metalic line for transmitting RF
signals.
~1 3~3~3 Likewise, referring to Fig. 7(b), a lead line is provided at an inside surface 612a of switch 612. A terminal 611d is connected to power controller 603. A terminal 611e is connected from battery 64.
A terminal 611f is connected from adaptor unit 7 through coaxial cable 8. If switch 612 is moved to the high position in Fig. ~(b), terminal 611d is connected to terminal 611e through the lead line. Accordingly, power controller 603 is connected to battery 64. If switch 612 is moved to the low position in Fig. ?(b), terminal 611d is connected to terminal 611f through the lead line. Accordingly, power controller 603 is con-nected to power controller ~02 in adaptor unit 7 through coaxial cable 8. Also, ~erminal 611g is provided at the end of swi~ch 612. Terminal 611g is connected from control circuit 602 as an input for the detection signal. Sinca power controller 603 is supplied power from battery ?4, or power controller ~02 in adaptor unit 7, the voltage level of the lead line of switch 612 is in an on state. Therefore, if switch 612 is moved tu the high position in Fig. ?(b), the voltags of switch 612 is applied to terminal 611g and the input to control circuit 602 becomes on state.
Conversely, if switches 612 is moved to the low position, the input to control circuit 602 beeomes an off state.
Fig. 8 is a block diagram of transmitter 606 shown in Fig. 6.
Control signals from control circuit 602, or speech signals from voicse circuit 601, are applied to a modulator 801. Modulator 801 modulate~
the applied signals on the basis of a modulation frequency signal pro-vided from synthesizer 608. The moclulated signals are applied to power amplifier (PA) 802. PA 8û2 amplifies the applied signals at an ampLification factor provided from an automatic power control circuit (APC) 803. APC 803 has the same arrangement of APC 305 shown in Fig. ~. APC 803 provides an amplification factor to PA 802 in response to a feedback signal, a level control signal, and the de~eetion signal from switch circuit 611. The amplified signals are applied to duplexer 609.
When switch 612 is moved to the high position in Fig. ?(a) and Fig. 7(b)9 power controller 603 is supplied power from battery 64 and duplexer 609 is coupled to antenna 66. ~lso, control circuit 602 receives the detection signal (an on state signal) from switch 611.
13~3~3 g Responsive to the detection signal, con~rol circuit 602 sends a controlsignal to switch circuit 402 (Fig. 4) of APC 803 so that the output of comparator 401 (Fig. 4) is applied to PA 80~ as an amplification factor.
Accordingly, each section of por~able unit 6 is supplied power from battery 64 via power controller 603. When the transmission signals provided from control circuit 602, or voice circuit 601, are applied to transmitter 606, these signals are amplified by PA 802 of transmitter 606 at an amplification factor responsive to the level control signal and the feedback signal. The amplified signals are applied to duplexer 609 and radiated from antenna 66.
When switch 612 remains in the low position in Fig. 7(a) and Fig. ~(b), if power switch 76 OI adaptor unit 7 is closed, power control-ler 603 is supplied power from the car battery via power controller 702 through coaxial cable 8. Duplexer 609 is coupled to duplexer 706 through coaxial cable 8. Also, control circuit 602 receives the detec-tion signal (an off state signal) from switch circuit 611. Responsive to the detection signal, control circuit 602 sends a control signal to switch circuit 402 (Fig. 4) of APC 803 so that a fixed voltage divided by resis-tors 403 and 404 is applied to PA 802 as an amplification factor. Also, control CiI'CUit 602 provides a level control signal to APC 709 in adap-tor unit 7 through coaxial cable ~. Accordingly, each section of both portable unit 6 and adaptor unit 7 is supplied power from car battery 9 via power controller 603 and 702. When the transmission signals pro-vided fronl control circuit 602, or voice circuit 601, are applied to transmitter 606, these signals are amplified in PA 802 of transmitter 606 at an amplification factor responsive to the fixed voltage.
The amplified signals are coupled to duplexer ~06 via coaxial cable 8 and applied to PA 708. APC 709 compares the level control signal with a feedback signal from the output of PA 708 and provides an output signal from the comparison to PA 708 ~ an amplification fac-tor. So, ~he signals applied to PA 708 is amplified at an amplification factor responsive to the level control signal and the feedback signal.
The signals amplified by PA 708 are applied to duplexer 609 and radi-ated from antenna 66.
L3153~3 It should be obvious from the above-disc~;sed apparatus embodi-ment that numerou~s other variations and modifications of the appara-tu~s of this invention are possible, and such will readily occur to those skilled in the art. Accordingly, the scope of this invention is not to be limited to the embodiment disclosed, but is to include any such embodi-ments as may be encompassed within the scope of the claims appended hereto.
This application is related by subject matter to copending Canadian ~pplication Serial No~ 578,508 entitled RADIO TELEPHONE APPARATUS ~iled September 27, 1988.
FIELD OF TH~ INVENTION
This invention relates to the field of radio telephona apparatus for transmitting signals over a selected radio channel and, more particularly, to an improved radio telephone apparatus which includes a portabl~ unit and an adaptor unit.
BAC~G~OU~D OE THE INV~MTIO~
Mobile radio telephones are known as radio telephone apparatus and are usad in vehicles such as automobiles. In an automobile telephone, a dial signal and a speech signal are input at a handset unit disposed near the seat of the automobile. These signals are transmitted from a transceiver unit, installed for example, in the trunk of the automobile, to a base station through which a communication link with a remote land line telephone or a remote radio telephone is established. In such a conventional automobile radio telephone apparatus, the handse!t unit near the automobile seat cannot be disconnected from the transceiver unit in the trunk. Thus, a user cannot use the apparatus outside the automobile.
The above-noted problems associated with prior art radio telephones are addressed by the radio telephone apparatus described and claimed in Application Serial 30 No. 578,508 m~ntioned above. The radio telephone described therein can be used inside or outside an automobile. Fig. 1 is a perspective view of such a radio telephone apparatus. The radio telephone apparatus comprises a portable unit 101 with an antenna 35 102 and an adaptor unit 103. Portable unit 101 and adaptor unit 103 are connected to each other by a coaxial cable 104. Adaptor unit 103 is supplied with power from a car battery (not shown) through a power cable 106 and is connected to an antenna 105 which is disposed outside the automobile. In accordance with the construction of the radio telephone apparatus, both portable unit 10l and adap70r unit 103 are equipped with a radio transmit/receiver circuitry. Thus, a user may communicate with another person by using portable unit 101 also or by using portable unit 101 attached to adaptor unit 103.
Fig. 2 is a block diagram of the radio circuitry which Applicants have found may be used in the radio telephone apparatus shown in Fig. 1. In the event that only portable unit 101 is available to the user, the output of power amplifier (PA) 106 is connected via switch 111 to antenna 102 which is provided on portable unit 101. The control and speech signals generated by signal source lO7 are thus amplified by PA 106 and then transmitted via antenna 102. The amplification factor of PA 106 is determined by automatic power control circuit (APC~ 108.
APC 108 determines the amplification factor in response to a level control signal received by level control signal receiver 112 from a base station (not shown) and a feedback signal provided from the output of PA 106. APC 108 provide a control signal which establishes the ampli-fication factor of PA 106.
In the event that adapter unit 103 is available to the user along with portable unit 101, the output of PA 106 is connected to the input of power amplifier (PA) 109 via switch 111. Thus, signals generated by signal source 107 are amplified by PA 106 and PA 109 and then trans-mitted via antenna 105. In this configuration, APC 108 controls PA 106 in response to the level control signal and the feedback signal. Also, an automatic power control circuit (APC) 110 in adaptor unit 103 controls PA 109 in response to a level control sigral received by level control signal receiver 114 from the base station (not shown) and a feedback signal provided from an output of PA 109.
Though the radio telephone apparatus illustrated in Fig. 2 repre-sents a substantial improvement over such apparatus known in the prior art, it remains deficient in a rumber of respects. One such defi-ciency is that it is difficult to control the power level of the final amplifi~er stage, i.e., the output level of PA 109. This is because the ~3~53~
input level to PA 109, i.e., the output level of PA 106, fluctuates in response to the control signal provided from APC 108.
SUMMARY OF_THE INVENTION
It is accordingly an object of an aspect of the present invention to provide an improved radio telephone apparatus including a portable unit and an adaptor unit in which transmission power level can be readily controlled.
It is an object of an aspect of the present invention to provide a portable unit capable of being attached to an adaptor unit wherein the output power level of the radio circuitry in the portable unit is stable.
Variou~ aspects of the invention are as follows:
A radio telephone apparatus comprising a portabla unit, an adaptor unit mounted in a vehicle and connectable to the portable unit through a cable, and a vehicle antenna provided on the vehicle, wherein.
the portable unit includes:
a signal source for generating transmission signals to be transmitted;
modulator meanC connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for providing the first amplification factor;
a portable antenna for receiving and transmitting radio fre~uency signals;
first terminal connected to the portable antenna;
13153~3 3a second terminal connected to a connector of the portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first 0 duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and switching means for selectively connecting the third terminal to either one of the first terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptor unit;
second amplifying means connected to the second duplexer means for amplifying the transmission signals from the seeond duplexer means on the basis of a se~ond 5 amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control 0 signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the vehicle antenna to the second duplexer means and applying th~ tran~mission signals amplified by the second amplifying means to the vehicle antenna; and ~31 '~3~3 3b the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and tha adaptcr unit for transmi.tting the transmission and reception signals.
A radio telephone apparatus comprising a portable unit, an adaptor unit connectable to the portable unit through a cable, and a first antenna associated with the adaptor unit, wherein:
the portable unit includesO
a signal source of generating transmission signals to be transmitted;
modulator means connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for p:roviding the first 0 amplification factor;
second antenna for receiv.ing and transmitting radio frequency signals;
first terminal connected to the second antenna;
second terminal connected to a connector of the 5 portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and ~3~3~
3c switching means for selectively connecting the third terminal to either one of tha Eirst terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptox unit;
second amplifying means connscted to the second lQ duplexer means for amplifying the transmission signals from the second duplexer means on the basis of a second amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the first antenna to the second duplexer means and applying the transmission signals amplified by the second amplifying means to the vehicle antenna; and the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and the adaptor unit for transmitting the transmission and reception signals.
By way of added explanation, in achieving these objects, as embodies and described herein, the invention ~It~
3d includes a portable radio telephone apparatus capable of heing selectively connected to an adaptor unit for transmitting a radio frequency signal a~ a certain power level responsive to a level control signal~ The apparatus includes an amplifier for amplifying the radio frequency signal by a predetermined amplification factor and an antenna for radiating the amplified radio frequency æignal. An operator actuatable switch is coupled to an output of the amplifier and is selectively coupled to the antenna and to an adaptor unit for applyiny the output signals of the amplifier to either the antenna or adaptor unit. A control device is coupled to the amplifier and the operator actuatable ~witch and is responsive to the level control signal for controlling the amplifier so that the amplification Pactor of the amplifier is fixed to a predetermined level when the operator actuatable switch is in a first state. The amplification factor of the amplifier is variable in response to the level control signal when the operator actuatable switch is in a second state.
The problems and deficiencies of other radio telephone apparatus discussed above are solved by the principles of the present invelltion. In this invention, responsive to an actuation of the operator actuatable switch, an amplification ~actor to be provided to the ampli~ier in the portable unit is fixed at a predetermined valueO Accordingly, the output power level of the ~mplifier becomes stable without fluctuating in response to a level control signal or a feedback signal. Therefore, in the event that the portable unit is connected to the 13:~5343 adaptor uni~. the ou~put power level of the adaptor unit can be accu-rately controlled in response to the level control signal.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a p~ive view of a ra~io te1e.~orle disc1Osed in ~ng Canadian Application Serial No. 57~,50~;
Figure 2 is a block diagram of the radio circuitry used in the radio telephone apparatus shown in Fig. l;
Figure 3 is a schematic block diagram of a radio transmission circuit used in a radio telephone apparatus in accordance with an embodiment of the present invention;
Figure ~ is a schematic diagram of automatic power control cir-cuit 305 shown in Fig. 3;
Figure 5 is a structural diagram of switching circuit 303 shown in Fig. 3;
Figure 6 is a block diagram of a mobile telephone in accordance with another embodiment of the present invention;
Figures 7(a) and (b) are structural diagrams of switch circuit 611 shown in Fig. 6;
Figure ~ is a block diagram of transmitter 606 shown in Fig. 6.
DETAILED DESCRIPTION OF THE PRE]FERRED ElIIE~OO~MENT
~ preferred embodiment of the present invention will be describe~ with reference to the accompanying drawings.
~ igure 3 is a block diagram of a radio transmission circuit used in a radio telephone apparatus according to one embodiment of the present invention. In Fig. 3, an antenna 301 is capable of being extended to increase its length for use or collapsed for storage when not in use. Such an antenna may be selected from among those known in the art as telescoping antennas. When antenna 301 is extended, the output of a power amplifier (PA~ 302 is connected tc antenna 301 by a switching circuit 303. Control and speech signals to be transmitted are provided from signal source circuit 304 in the form of radio frequency (RF) signals and are radiated from an~enna 301 after being amplified by PA 302. A portion of the output signal from PA 302 is coupled to an automatic power control circuit (APC) 305 as a feed back signal. ~lso, switching circuit 303 sends a detection signal (an on state signal) 13~3~3 indicative of the extension of antenna 301 to APC 305 via a control circuit 306. Responsive to the cletection signal, APC 3Q5 controls PA
30~ so that the amplification factor of PA 302 is variable In response to a level control signal. PA 302 changes it's amplification factor in response to the level of the control signal provided from APC 305. The level control signal is transmitted from a base station and is received by a radio reception circuit 314 and is provided to APC 305 via control circuit 306.
Fig. 4 is a schematic diagram of APC 305. The level control sig-nal is compared to the feedback signal by a comparator circuit 401.
When an~enna 301 is extended, switching circuit 402 switches to the B
position so that the output of comparator circuit 401 is applied to PA
302 as the control signal.
Thus, by extending antenna 301, portable unit 30û is able to transmit an RF signal without the adaptor unit which has a magnitude responsive to the level control signal. It should be noted that the swi~ching opera~ion in switching circuit 303 IFig. 3) and switching ci~
cuit 402 (Fig. 4) depends on the extension of antenna 301 provided at portable unit 300, not on the connection between portable unit 300 and adaptor unit 307. Therefore, it is no~ nece~sary in this inven~ion to detect a connection between portable unit 300 and adaptor unit 307.
Thus, circuitry for detecting the connected relationship is not needed.
Referring to Fig. 3 again, when antenna 301 is collapsed, th output of PA 3û2 is coupled to an output terminal 308. Output terminal 308 is coupled to an input terminal 309 which is connected to power amplifier (PA~ 310 of adaptor unit 30~ through coa~ial cable 311.
Accordingly, the output signals from PA 302 are applied to the input of PA 310. The applied signals are radiated from antenna 312 after being amplified by PA 31n. A portion of the outpu~ signal from PA 310 is supplied to an automatic power control circuit (APC3 313 as a feedback signal. Also, switching circuit 303 sends a detection signal (an o~f state signal) indicative of the collapsed state of antenna 301 to APC 305 via control eircuit 306. Responsive to the detection signal, A~C 305 con-trols PA 302 so that the amplification factor of PA 302 is fixed to a predetermined level.
13~ ~3~3 Referring to Fig. 4 again, resporlsive to the detecting signal (an off state signal), switching circuit 402 changes to the a position so that a predetermined voltage level, which is provided trom a power supply voltage Vs divided by resistors 403 and 404, is applied to PA 302. The amplification factor of PA 302 is thus fixed to a predetermined level.
The level is set at a predetermined level so that PA 310 in adaptor unit 7 is appropriately driven.
The level control signal provided from control circuit 306 also is applied to ~PC 313. In APC 313, the level control signal is compared with the feed back signal from the output OI PA 310 by a comparator circuit 314. An output of comparator circuit 314 is applied to PA 310.
Thus, by collapsing antenna 301, an RF signal is amplified at a predetermined amplification level in portable unit 300. The amplified RF si~,nal is coupled to adaptor unit 30~ and further amplified by an amplification factor responsive to the level control signal in adaptor unit 307.
Fig. 5 is a structural diagram of switching circuit 303 showrl in Fig. 3. A hole 501 is provided in portable unit 300 to accommodate antenna 301. At a side wall of hole 501, two switch elements 502 and 503 are provided so as to be pushed aside when antenna 301 is accom-modated in hole 501. One end of swit~h element 502 is connected to the output of PA 302. A line 504 is connected from antenna 301 on one end of switch element 502 when antenna 301 is extended. When antenna 301 is accommodated in hole 501, switch element 502is pushed aside and then the other end of switch element 502 is connectsd to the input of PA 310. Switch element S03 is used for generating the detec-tion signal indicative of the state of antenna 301.
If antenna 301 is extended, the detection signal is maintained at a high logic level since signal line 505 is pulled to a high voltage level by power supply voltage Vs since it is not in contact with switch ele-ment 503. I~ antenna 301 is accomrnodated in hole 501, the detection signai is maintained at a low level since signal line 505 contacts one end of switch element 503 and the other end o~ switch element 503 is connected to ground.
~3:L~3~3 Another embodiment of the present invantion relating to a mobile telephone includes a portable unit and an adaptor unit will be described. Fig. 6 is a block diagram showing the arrangement of the mobile telephone according to this embodiment.
~ portable unit 5 comprises an antenna 66, a duplexer 609, a receiver 607, a transmitter 606, a synthesizer 608, a voice circuit 601, a controi circuit 602, a power controller 603, a battery 64, a speaker 62, a microphone 63, switch circuits 605, 610, and 611, a connection terminal 6~ and a cable connector 604.
An adaptor unit ? comprises a booster unit 700, a voice circuit 701, a power controller 702, a control circuit 703, an antenna 9, a loud-speaker 74, a microphone 75, a power switch ~6, a connection terminal 73, a cable connector ?04, and a battery connector 710. Booster unit 700 comprises duplexers 705 and 706, a reception amplifier ?07, a transmission power ampli~ier 708, and an automatic power control cir-cuit (APC) 709. A car battery 9 is connected to battery connector 710.
Portable unit 6 is connected to adaptor unit 7 via a coaxial cable 8 connected to cable connectors 604 and ?04. A~so~ portable unit 6 is directly connected to adaptor unit 7 through connection terminals 6l and 73.
Fig. ~(a) and Fig. 7(b) are structural diagrams of switch circuit 611 in portable unit 6. Referring to Fi~. 7~a), a strip line iS provided at an inside surface 612a of switch 612. A terminal 611a is connected to duplexer 609. A terminal 611b is connected to antenna 6b. A terminal 611c is connected to adaptor unit 7 through coaxial cable 8. If switch 612 is moved to the high position in Fig. 7(a), terminal 611a is con-nected to terminal 611b ~hrough the strip line. Accordingly, duplexer 609 is coupled to antenna 66. If switch 612is moved to the low position in Fig. 7(a~, terminal 611a is connected to terminal 611c through the strip line. Accordingly? duplexer 609 is coupled to duplexer 706 in adaptor unit i? through coaxial cable 8. The transmission line between antenna 66 and duplexer 609, or between duplexer ?06 and duplexer 609, is formed of a strip line ahd a metalic line for transmitting RF
signals.
~1 3~3~3 Likewise, referring to Fig. 7(b), a lead line is provided at an inside surface 612a of switch 612. A terminal 611d is connected to power controller 603. A terminal 611e is connected from battery 64.
A terminal 611f is connected from adaptor unit 7 through coaxial cable 8. If switch 612 is moved to the high position in Fig. ~(b), terminal 611d is connected to terminal 611e through the lead line. Accordingly, power controller 603 is connected to battery 64. If switch 612 is moved to the low position in Fig. ?(b), terminal 611d is connected to terminal 611f through the lead line. Accordingly, power controller 603 is con-nected to power controller ~02 in adaptor unit 7 through coaxial cable 8. Also, ~erminal 611g is provided at the end of swi~ch 612. Terminal 611g is connected from control circuit 602 as an input for the detection signal. Sinca power controller 603 is supplied power from battery ?4, or power controller ~02 in adaptor unit 7, the voltage level of the lead line of switch 612 is in an on state. Therefore, if switch 612 is moved tu the high position in Fig. ?(b), the voltags of switch 612 is applied to terminal 611g and the input to control circuit 602 becomes on state.
Conversely, if switches 612 is moved to the low position, the input to control circuit 602 beeomes an off state.
Fig. 8 is a block diagram of transmitter 606 shown in Fig. 6.
Control signals from control circuit 602, or speech signals from voicse circuit 601, are applied to a modulator 801. Modulator 801 modulate~
the applied signals on the basis of a modulation frequency signal pro-vided from synthesizer 608. The moclulated signals are applied to power amplifier (PA) 802. PA 8û2 amplifies the applied signals at an ampLification factor provided from an automatic power control circuit (APC) 803. APC 803 has the same arrangement of APC 305 shown in Fig. ~. APC 803 provides an amplification factor to PA 802 in response to a feedback signal, a level control signal, and the de~eetion signal from switch circuit 611. The amplified signals are applied to duplexer 609.
When switch 612 is moved to the high position in Fig. ?(a) and Fig. 7(b)9 power controller 603 is supplied power from battery 64 and duplexer 609 is coupled to antenna 66. ~lso, control circuit 602 receives the detection signal (an on state signal) from switch 611.
13~3~3 g Responsive to the detection signal, con~rol circuit 602 sends a controlsignal to switch circuit 402 (Fig. 4) of APC 803 so that the output of comparator 401 (Fig. 4) is applied to PA 80~ as an amplification factor.
Accordingly, each section of por~able unit 6 is supplied power from battery 64 via power controller 603. When the transmission signals provided from control circuit 602, or voice circuit 601, are applied to transmitter 606, these signals are amplified by PA 802 of transmitter 606 at an amplification factor responsive to the level control signal and the feedback signal. The amplified signals are applied to duplexer 609 and radiated from antenna 66.
When switch 612 remains in the low position in Fig. 7(a) and Fig. ~(b), if power switch 76 OI adaptor unit 7 is closed, power control-ler 603 is supplied power from the car battery via power controller 702 through coaxial cable 8. Duplexer 609 is coupled to duplexer 706 through coaxial cable 8. Also, control circuit 602 receives the detec-tion signal (an off state signal) from switch circuit 611. Responsive to the detection signal, control circuit 602 sends a control signal to switch circuit 402 (Fig. 4) of APC 803 so that a fixed voltage divided by resis-tors 403 and 404 is applied to PA 802 as an amplification factor. Also, control CiI'CUit 602 provides a level control signal to APC 709 in adap-tor unit 7 through coaxial cable ~. Accordingly, each section of both portable unit 6 and adaptor unit 7 is supplied power from car battery 9 via power controller 603 and 702. When the transmission signals pro-vided fronl control circuit 602, or voice circuit 601, are applied to transmitter 606, these signals are amplified in PA 802 of transmitter 606 at an amplification factor responsive to the fixed voltage.
The amplified signals are coupled to duplexer ~06 via coaxial cable 8 and applied to PA 708. APC 709 compares the level control signal with a feedback signal from the output of PA 708 and provides an output signal from the comparison to PA 708 ~ an amplification fac-tor. So, ~he signals applied to PA 708 is amplified at an amplification factor responsive to the level control signal and the feedback signal.
The signals amplified by PA 708 are applied to duplexer 609 and radi-ated from antenna 66.
L3153~3 It should be obvious from the above-disc~;sed apparatus embodi-ment that numerou~s other variations and modifications of the appara-tu~s of this invention are possible, and such will readily occur to those skilled in the art. Accordingly, the scope of this invention is not to be limited to the embodiment disclosed, but is to include any such embodi-ments as may be encompassed within the scope of the claims appended hereto.
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A radio telephone apparatus comprising a portable unit, an adaptor unit mounted in a vehicle and connectable to the portable unit through a cable, and a vehicle antenna provided on the vehicle, wherein:
the portable unit includes:
a signal source for generating transmission signals to be transmitted;
modulator means connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for providing the first amplification factor;
a portable antenna for receiving and transmitting radio frequency signals;
first terminal connected to the portable antenna;
second terminal connected to a connector of the portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and switching means for selectively connecting the third terminal to either one of the first terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptor unit;
second amplifying means connected to the second duplexer means for amplifying the transmission signals from the second duplexer means on the basis of a second amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the vehicle antenna to the second duplexer means and applying the transmission signals amplified by the second amplifying means to the vehicle antenna; and the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and the adaptor unit for transmitting the transmission and reception signals.
the portable unit includes:
a signal source for generating transmission signals to be transmitted;
modulator means connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for providing the first amplification factor;
a portable antenna for receiving and transmitting radio frequency signals;
first terminal connected to the portable antenna;
second terminal connected to a connector of the portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and switching means for selectively connecting the third terminal to either one of the first terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptor unit;
second amplifying means connected to the second duplexer means for amplifying the transmission signals from the second duplexer means on the basis of a second amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the vehicle antenna to the second duplexer means and applying the transmission signals amplified by the second amplifying means to the vehicle antenna; and the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and the adaptor unit for transmitting the transmission and reception signals.
2. The radio telephone apparatus of Claim 1 wherein the first control means provides the first amplification factor in response to the output signal level of the first amplifying means and a level control signal when the switching means connects the third terminal to the first terminal.
3. The radio telephone apparatus of Claim 1 wherein the first control means provides the first amplification factor which is fixed to a predetermined value when the switching means connects the third terminal to the second terminal.
4. The radio telephone apparatus of Claim 1 wherein the switching means connects the third terminal to the second terminal when the connector of the portable unit is connected with the connector of the adaptor unit through the cable.
5. The radio telephone apparatus of Claim 1 wherein the switching means connects the third terminal to the first terminal when the connector of the portable unit is not connected with the connector of the adaptor unit.
60 The radio telephone apparatus of Claim 1 wherein the portable unit comprises a first battery and the portable unit is supplied power with the first battery when the connector of the portable unit is not connected with the connector of the adaptor unit and wherein the portable unit and the adaptor unit are supplied power with a second battery mounted in the vehicle when the connector of the portable unit is connected with the connector of the adaptor unit through a power supplied line in the cable.
7. The radio telephone apparatus of Claim 6 wherein the first battery is a rechargeable battery and the first battery is charged by the second battery when the connector of the portable unit is connected with the connector of the adaptor unit through the power supply line.
8. A radio telephone apparatus comprising a portable unit, an adaptor unit connectable to the portable unit through a cable, and a first antenna associated with the adaptor unit, wherein:
the portable unit includes:
a signal source of generating transmission signals to be transmitted;
modulator means connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for providing the first amplification factor;
second antenna for receiving and transmitting radio frequency signals;
first terminal connected to the second antenna;
second terminal connected to a connector of the portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and switching means for selectively connecting the third terminal to either one of the first terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptor unit;
second amplifying means connected to the second duplexer means for amplifying the transmission signals from the second duplexer means on the basis of a second amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the first antenna to the second duplexer means and applying the transmission signals amplified by the second amplifying means to the vehicle antenna; and the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and the adaptor unit for transmitting the transmission and reception signals.
the portable unit includes:
a signal source of generating transmission signals to be transmitted;
modulator means connected to the signal source for modulating the transmission signals generated by the signal source;
first amplifying means connected to the modulator means for amplifying the transmission signals modulated by the modulator means on the basis of a first amplification factor;
first control means for providing the first amplification factor;
second antenna for receiving and transmitting radio frequency signals;
first terminal connected to the second antenna;
second terminal connected to a connector of the portable unit;
third terminal;
first duplexer means connected to the third terminal and the first amplifying means for applying the transmission signals amplified by the first amplifying means to the third terminal and for receiving reception signals from the third terminal and providing the reception signals to a reception terminal of the first duplexer means;
receiver means connected to the reception terminal of the first duplexer means for receiving the reception signals from the first duplexer means; and switching means for selectively connecting the third terminal to either one of the first terminal or the second terminal;
the adaptor unit includes:
second duplexer means connected to a connector of the adaptor unit for receiving transmission signals from the connector of the adaptor unit and for applying reception signals to the connector of the adaptor unit;
second amplifying means connected to the second duplexer means for amplifying the transmission signals from the second duplexer means on the basis of a second amplification factor;
second control means coupled to the output of the second amplifying means for providing the second amplification factor in response to the output signal level of the second amplifying means and a level control signal; and third duplexer means connected to the second duplexer, the vehicle antenna, and the output of the second amplifying means for applying the reception signals from the first antenna to the second duplexer means and applying the transmission signals amplified by the second amplifying means to the vehicle antenna; and the cable includes:
a unique signal line coupled to the connectors of both of the portable unit and the adaptor unit for transmitting the transmission and reception signals.
9. The radio telephone apparatus of Claim 8 wherein the first control means provides the first amplification factor in response to the output signal level of the first amplifying means and a level control signal when the switching means connects the third terminal to the first terminal.
10. The radio telephone apparatus of Claim 8 wherein the first control means provides the first amplification factor which is fixed to a predetermined value when the switching means connects the third terminal to the second terminal.
11. The radio telephone apparatus of Claim 8 wherein the switching means connects the third terminal to the second terminal when the connector of the portable unit is connected with the connector of the adaptor unit through the cable.
12. The radio telephone apparatus of Claim 8 wherein the switching means connects the third terminal to the first terminal when the connector of the portable unit is not connected with the connector of the adaptor unit.
13. The radio telephone apparatus of Claim 8 wherein the portable unit comprises a first battery and the portable unit is supplied power with the first battery when the connector of the portable unit is not connected with the connector of the adaptor unit and wherein the portable unit and the adaptor unit are supplied power with a second battery, which output voltage is higher than that of the first battery, when the connector of the portable unit is connected with the connector of the adaptor unit through a power supplied line in the cable.
14. The radio telephone apparatus of Claim 13 wherein the first battery is a rechargeable battery and the first battery is charged by the second battery when the connector of the portable unit is connected with the connector of the adaptor unit through the power supply line.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPP63-46062 | 1988-02-29 | ||
| JP63046062A JPH01220919A (en) | 1988-02-29 | 1988-02-29 | Radio telephone set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1315343C true CA1315343C (en) | 1993-03-30 |
Family
ID=12736524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000592356A Expired - Fee Related CA1315343C (en) | 1988-02-29 | 1989-02-28 | Radio telephone apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US5048117A (en) |
| EP (1) | EP0331435B1 (en) |
| JP (1) | JPH01220919A (en) |
| KR (1) | KR890013912A (en) |
| CA (1) | CA1315343C (en) |
| DE (1) | DE68928563T2 (en) |
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| JPS6486739A (en) * | 1987-09-29 | 1989-03-31 | Toshiba Corp | Car telephone equipment |
-
1988
- 1988-02-29 JP JP63046062A patent/JPH01220919A/en active Pending
-
1989
- 1989-02-28 DE DE68928563T patent/DE68928563T2/en not_active Expired - Fee Related
- 1989-02-28 KR KR1019890002393A patent/KR890013912A/en not_active IP Right Cessation
- 1989-02-28 EP EP89301984A patent/EP0331435B1/en not_active Expired - Lifetime
- 1989-02-28 US US07/316,913 patent/US5048117A/en not_active Expired - Lifetime
- 1989-02-28 CA CA000592356A patent/CA1315343C/en not_active Expired - Fee Related
-
1991
- 1991-05-20 US US07/702,306 patent/US5095541A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5048117A (en) | 1991-09-10 |
| DE68928563T2 (en) | 1998-06-04 |
| KR890013912A (en) | 1989-09-26 |
| EP0331435A3 (en) | 1991-07-31 |
| EP0331435B1 (en) | 1998-01-28 |
| JPH01220919A (en) | 1989-09-04 |
| US5095541A (en) | 1992-03-10 |
| DE68928563D1 (en) | 1998-03-05 |
| EP0331435A2 (en) | 1989-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |