Emergency traffic control system with security transmission coding
First Claim
1. An emergency system for remotely controlling the light latches associated with traffic signal lights comprising:
- a. a remotely located transmitter means including;
i. first and second RF oscillators,ii. means for transmitting the signals generated by said oscillators,iii. means for generating a binary code,iv. logic means for gating the output of said first or second oscillator to said transmitting means according to said code thereby to transmit a binary coded RF signal;
b. means for receiving the binary coded RF signals including;
i. first means for comparing said coded signal and producing an output indicative of a match,ii. means responsive to the output from said first comparison means for enabling a first signal light latch.
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Abstract
An emergency traffic control system is disclosed for use with emergency vehicles to control traffic signal lights. A coded transmitter employing frequency shift keying is provided in the emergency vehicle and upon actuation, transmits a coded signal to a traffic signal light which is provided with a receiver. Upon reception of a verified signal, the receiver causes the signal light to indicate a steady red in all directions. The emergency system further includes a test circuit for positively determining whether the traffic signal is under control of the emergency vehicle to prevent an accident if two emergency vehicles are simultaneously trying to control the same traffic signal light.
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Citations
6 Claims
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1. An emergency system for remotely controlling the light latches associated with traffic signal lights comprising:
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a. a remotely located transmitter means including; i. first and second RF oscillators, ii. means for transmitting the signals generated by said oscillators, iii. means for generating a binary code, iv. logic means for gating the output of said first or second oscillator to said transmitting means according to said code thereby to transmit a binary coded RF signal; b. means for receiving the binary coded RF signals including; i. first means for comparing said coded signal and producing an output indicative of a match, ii. means responsive to the output from said first comparison means for enabling a first signal light latch. - View Dependent Claims (2)
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3. An emergency system for remotely controlling the light latches associated with traffic signal lights comprising:
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a. a remotely located transmitter means including; i. first and second RF oscillators, ii. means for transmitting the signals generated by said oscillators, iii. means for generating a binary code, iv. logic means for gating the output of said first or second oscillator to said transmitting means according to said code thereby to transmit a binary coded RF signal; b. means for receiving said coded RF signal including; i. means for reproducing said binary code from said RF signal, ii. first means for comparing the reproduced binary code against a preset operation code and producing an output indicating a match, iii. means for counting the number of times a coded RF signal is received during a preselected interval, iv. means responsive to the output from said first comparison means for enabling a first signal light latch if said counting means has a count of one and for enabling an additional light latch if a count of two. - View Dependent Claims (4, 5, 6)
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Specification