Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1977-09-07
1979-04-03
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340505, 325 55, 325308, G08B 108
Patent
active
041480210
ABSTRACT:
An alarm system utilizes a bidirectional wired TV system constructed to transmit a TV signal received by a community antenna to a central station and a plurality of subscribers' stations through a bidirectionally transmissible line. Each of the subscribers' stations is provided with an automatic and/or manual alarm signal generator for generating a low frequency alarm signal representing any of emergency conditions and the subscriber's number, a carrier wave generator, and a modulator for modulating a high frequency carrier wave signal generated by the carrier wave generator with the alarm signal from the alarm signal generator. The central station is provided with a demodulator for receiving and demodulating the modulated alarm signal transmitted from any subscriber's station through the bidirectionally transmissible line, an alarm signal identifying device energized by the demodulated alarm signal from the demodulator, a carrier wave generator, and a remodulator for remodulating a different high frequency carrier wave signal generated by the carrier wave generator with the demodulated alarm signal from the demodulator. Any of the subscribers' stations are each further provided with a redemodulator for receiving and redemodulating the remodulated alarm signal transmitted from the central station through the bidirectionally transmissible line, and an alarm signal identifying device energized by the redemodulated alarm signal from the redemodulator.
REFERENCES:
patent: 3840812 (1974-10-01), Takeuchi et al.
patent: 3996578 (1976-12-01), Takeuchi et al.
patent: 4075628 (1978-02-01), Masuda et al.
Hochiki Corporation
Waring Alvin H.
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