Transceiver having improved voice actuated carrier and echo supp

Details Transceiver having improved voice actuated carrier and echo supp Transceiver having improved voice actuated carrier and echo supp

1975-03-13

1976-03-02

Safourek, Benedict V.

1791706, H04B 144

Patent

active

039421163

ABSTRACT:
A transceiver comprising a transmit circuit for receiving a transmit audio frequency signal from a voice input transducer and including a delay line for delaying the transmit audio frequency signal, a modulator for converting the delayed transmit audio frequency signal to a transmitable radio frequency signal and a first switchable attenuator responsive to a control signal and operative to selectively couple the radio frequency signal to an output terminal for transmission; a receive circuit for receiving a responsive radio frequency transmission and including a demodulator for converting the received radio frequency signal to a received audio frequency signal, and a second switchable attenuator responsive to the control signal and operative to selectively couple the received audio frequency signal to a voice output transducer; and a control circuit including a transmit detector for detecting the transmit audio frequency signal level, a receive detector for detecting the received audio frequency signal level, and a comparator for comparing the outputs of the transmit detector and receive detector and developing the control signal.

REFERENCES:
patent: 1691076 (1928-11-01), Mathes
patent: 2820108 (1958-01-01), Kass
patent: 3145269 (1964-08-01), Gardner et al.
patent: 3283074 (1966-11-01), Csicsatka
patent: 3351720 (1967-11-01), Brady
patent: 3397401 (1968-08-01), Winterbottom
patent: 3560669 (1971-02-01), Foulkes et al.

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