Dual tone selector with answerback signalling

Details Dual tone selector with answerback signalling Dual tone selector with answerback signalling

1976-07-26

1977-12-20

Cooper, William C.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340171R, H04M 1100

Patent

active

040643670

ABSTRACT:
A function control code sequence of signals, each comprising a pair of audio frequency tones, is transmitted from a control location to a remote station selector. Each input signal is applied to a tone decoder element which separates the two tones through a filter, amplifier, detector network to produce a pair of logic signals representing the tones received. The sequential pairs of logic signals are applied to a code selector which converts the 2 of 7 format into a 1 of 12 digital code sequence equivalent to the original function control code selected at the control location. This digital sequence is applied through a programmable cross bar connector matrix to a sequence detector responsive only to a predetermined input sequence. The matrix is programmed to produce this predetermined sequence and actuate the sequence detector only when an assigned function code is received. When the sequence detector is actuated, its output is applied through another matrix to a pulse generator which produces an output pulse to actuate the desired function control. Each output pulse is also applied to the tone decoder to enable an analog switch which completes a feedback path for one of the input bandpass filter, compression amplifier networks. When the feedback path is complete, the filter, amplifier network oscillates at a preselected audio frequency to transmit an answerback signal to the control location to indicate that the transmitted function has been registered.

REFERENCES:
patent: 3631395 (1971-12-01), Zucker
patent: 3654396 (1972-04-01), Biezeveld
patent: 3849764 (1974-11-01), Wang
patent: 3859462 (1975-01-01), Saxon

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