H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/15
H04B 1/44 (2006.01) H04B 1/46 (2006.01) H04B 1/58 (2006.01) H04B 3/20 (2006.01)
Patent
CA 1054680
ABSTRACT OF THE DISCLOSURE A transceiver comprising a transcript circuit for receiv- ing a transmit audio frequency signal from a voice input trans- ducer and including a delay line for delaying the transmit audio frequency signal, a modulator for converting the delayed trans- mit 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 in- cluding a demodulator for converting the received radio frequency signal to a received audio frequency signal, and a second switch- able 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.
247770
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