|Publication number||USRE38763 E1|
|Application number||US 09/577,031|
|Publication date||Jul 26, 2005|
|Filing date||May 23, 2000|
|Priority date||Jun 6, 1995|
|Also published as||US5757284|
|Publication number||09577031, 577031, US RE38763 E1, US RE38763E1, US-E1-RE38763, USRE38763 E1, USRE38763E1|
|Inventors||Christopher Trizzino, Thomas S. Florian, Karen M. Kickel, Susan Trizzino|
|Original Assignee||Trianco, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (18), Non-Patent Citations (3), Referenced by (3), Classifications (8), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates generally to an emergency vehicle warning system and method and, more particularly, to an emergency vehicle warning system and method utilizing a radio frequency communication link.
Emergency vehicles, such as police patrol cars, ambulances and fire engines, when in an emergency state, travel at a high rate of speed and usually, do so through crowded streets and roadways. The law requires that other motor vehicles immediately give the right-of-way to the emergency vehicle. The driver of the motor vehicle, then, must be aware of the approach of the emergency vehicle within a suitable time to safely allow this right-of-way. In order to alert drivers of motor vehicles the approach of an emergency vehicle in an emergency status, the emergency vehicle relies on sight and sound; eg. flashing lights, sirens and horns.
These methods for alerting drivers to the approach of an emergency vehicle are becoming less effective. Advancements in automobile sound proofing and dampening have diminished the amount of external sound intruding into the passenger compartment of an automobile. Combining those advancements with the increased use of cellular car phones and more powerful car stereo systems employing tape decks and CD's, as well as radios, results in a driver being less aware of a siren or horn of an emergency vehicle. Although automobile design advancements have not impaired the driver's vision, the driver must be looking in the emergency vehicle's general direction to be able to see its flashing lights to become aware that it is an emergency state. This would not necessarily occur in the case of a emergency vehicle located behind, and traveling in the same direction of, a motor vehicle. This is also the case of an emergency vehicle approaching an intersection where the cross traffic approaching that intersection can neither hear not see the emergency vehicle. Without an effective way of communicating the approach of an emergency vehicle in an emergency state there is a heightened risk of collisions and therefore, the safety of the emergency vehicle and its occupants along with other motor vehicles and their occupants is jeopardized.
Previous efforts involving emergency vehicles focused on traffic signal preemption or vehicle location. U.S. Pat. No. 4,914,434 issued to Rodney K. Morgan and Bradley K. Cross on Apr. 3, 1990 teaches a system for transmitting a series of UHF spaced apart messages. The emergency vehicle transmits the signal to preempt the normal operation of traffic signals. This patent was an improvement over prior patents teaching traffic signal preemption devices utilizing radio and optical transmitters. U.S. Pat. No. 3,984,807 issued to Adrian B. Haemmig on Oct. 5, 1976 teaches a system for locating emergency vehicles utilizing a plurality of wayside stations each having a radio transmitter with a unique geographical coding. As the emergency vehicle passes such a station a signal is transmitted to a home base or headquarters advising of the whereabouts of the emergency vehicle.
Patents teaching vehicle collision avoidance systems or devices are based on ultrasonic transmitters (U.S. Pat. No. 5,339,075 issued to Terrill Abst on Aug. 16, 1994 and U.S. Pat. No. 5,235,316 issued to Gregory K. Qualizza on Aug. 10, 1993), permanent magnets embedded in a highway (U.S. Pat. No. 5,369,591 issued to Charles Broxmeyer on Nov. 29, 1994) and road surface friction detectors (U.S. Pat. No. 5,286,099 issued to Yasuhiko Fujita, Toshiaki Arai and Makoto Sato on Feb. 15, 1994. U.S. Pat. No. 5,281,947 issued to Clarence W. Durley and Jerry A. Robinson on Jan. 25, 1994 teaches a vehicle safety sensor and warning system employing Microwave Doppler Radar Shift Technology to detect personnel within a predetermined proximity.
These patents, while generally teaching a system for locating a vehicle or avoiding a collision between vehicles and accidents involving people, do not address or resolve the problem of adequately advising a driver of a motor vehicle of the approach of an emergency vehicle when it is an emergency state to allow the driver to give it the right-of-way and, thereby, assuring its safe and expedient passage while, at the same time, assuring the safety of other motor vehicles in or crossing the emergency vehicle's path.
Accordingly, a need exists for a system to advise the driver of a motor vehicle of the approach of an emergency vehicle in an emergency state in addition to the traditional methods of sight and sound.
The present invention provides a system to satisfy the aforementioned need.
Accordingly, the present invention is directed to a system for alerting a driver of a motor vehicle of the approach of an emergency vehicle in an emergency status, comprising an emergency vehicle with transmitting means therein which produces and transmits a radio frequency signal with a certain range and has a unique audio encoded data signature modulated thereon when the emergency vehicle is in an emergency status. The system also comprises a motor vehicle within the range of the radio frequency signal having receiving means which receives the radio frequency signal, demodulates and decodes it and produces a voltage output when the unique audio encoded data signature is present. The system also comprises alarm producing means which produces an alarm in response to the voltage output warning the driver of said motor vehicle of the approach of said emergency vehicle.
In another aspect, the invention is directed to a method for alerting a driver of a motor vehicle of the approach of an emergency vehicle in an emergency status, comprising the steps of: providing an emergency vehicle equipped with transmitting means therein, transmitting from the emergency vehicle a radio frequency signal with a certain range and having a unique audio encoded data signature modulated thereon when the emergency vehicle is in an emergency status, providing a motor vehicle within the range of the radio frequency signal and having receiving means and alarm producing means therein, receiving the radio frequency signal by the receiving means in the motor vehicle, demodulating the radio frequency signal, decoding the radio frequency signal, producing a voltage output when the unique audio encoded data signature is detected, and producing an alarm in response to the voltage output warning the driver of the motor vehicle of the approach of said emergency vehicle.
Further features of the present invention will become apparent to those skilled in the art to which the present invention relates from reading the following specification with reference to the accompanying drawings in which:
Referring now to the drawings and, more particularly,
Referring now to
Referring now to
First intermediate frequency synthesizing means 54 generates a first mixing signal 82. An oscillator buffer 56 amplifies the first mixing signal 82 and provides impedance matching with a first mixing means 58. The first mixing means 58 mixes the conditioned radio frequency signal 80 with the first mixing signal 82 resulting in a first intermediate frequency signal 84. Intermediate frequency preamplifier 60 increases the gain of the first intermediate frequency signal 84 and provides a high impedance output. The intermediate frequency crystal filter 62 filters the first intermediate frequency signal 84 to eliminate all but one of the four frequencies produced at the output of the first mixing means 58. A intermediate frequency amplifier 64 increases the gain of the first intermediate frequency signal 84 to a usable level of approximately +5 dbm to overcome any losses that may have occurred in the intermediate frequency crystal filter 62. The intermediate frequency amplifier 64 also provides impedance matching.
Second intermediate frequency synthesizing means 66 has a crystal controlled oscillator which generates a second mixing signal 86. The second intermediate frequency synthesizing means 66 operates similarly to the first intermediate frequency synthesizing means 54 but at a lower frequency. Second mixing means 70 mixes the second mixing signal 86 with first intermediate frequency signal 84 and results in a second intermediate frequency signal 90, advantageously, at a frequency of 455 KHz. A bipolar filter circuit 68 filters the second intermediate frequency signal 90. The second mixing means 70 operates similarly to the first mixing means 58 but at a considerably lower frequency based on the frequency of the second intermediate frequency synthesizing means 66. The bipolar filter circuit 68 contains a crystal filter which filters the second intermediate frequency signal 90 to eliminate all but one of the four frequencies produced at the output of the second mixing means 70 but is broad enough to pass a modulated radio frequency of 455 KHz. This allows for the modulation changes and possible slight frequency drifts that are encountered. The second mixing means 70 has a limiter circuit 92 that provides gain uniformity and amplification and a discriminator circuit 94 that removes the modulated data information from the second intermediate frequency signal 90 and converts it into demodulated data audio output 96. The demodulated data audio output 96 is an exact audio replica (with the exception of audio level) of the coded data audio output 48 of the transmitting means 16.
A demodulated data audio amplifier 72 amplifies the demodulated data audio output 96 and includes an impedance matching circuit which provides a proper match between the second mixing means 70 and a demodulated data audio decoder 74. The demodulated data audio decoder 74 decodes the demodulated audio output 96 and, if it detects the unique signature originally encoded by the data encoding means 28 of the transmitting means 16, produces a voltage output 98.
Alarm producing means 26 has a demodulated data switch 76 which responds to the voltage output 98 and activates alarm 78 alerting the driver of the motor vehicle 14 of the approach of an emergency vehicle 12 in an emergency state. The alarm 78 can be incorporated into the motor vehicle's radio which would turn down, or turn off, the radio when the voltage output 98 is produced.
Now that the invention has been described, variations and modifications will become apparent to those skilled in the art. It is intended that such variations and modifications be encompassed within the scope of the appended claims.
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|1||*||RADAR Report dated Sep. 1995.|
|2||*||Safety Warning System Newsletter dated Feb. 1995.|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7110731 *||Dec 11, 2003||Sep 19, 2006||Alert Technologies International||Dual-mode transmitter|
|US20040166819 *||Dec 11, 2003||Aug 26, 2004||Derome George E.||Dual-mode transmitter|
|US20060176190 *||Jul 7, 2005||Aug 10, 2006||Madison Brian C||Emergency vehicle alert system|
|U.S. Classification||340/902, 340/904, 340/903, 340/6.1|
|International Classification||G08G1/0965, G08G1/00|
|Nov 18, 2005||FPAY||Fee payment|
Year of fee payment: 8
|Dec 28, 2009||REMI||Maintenance fee reminder mailed|
|May 21, 2010||LAPS||Lapse for failure to pay maintenance fees|