Amplifier circuit for increasing transmit and receive levels in

Details Amplifier circuit for increasing transmit and receive levels in Amplifier circuit for increasing transmit and receive levels in

1975-06-30

1976-06-15

Claffy, Kathleen H.

179 81A, 179 1HF, H04M 160, H04M 158

Patent

active

039638766

ABSTRACT:
A telephone amplifier circuit comprising a transmit amplifier and a receive amplifier provides gain in both the transmit and the receive directions. Loss is voice-switched into the receive amplifier in response to the sum of the transmit and receive speech levels to provide sidetone and gain control.

REFERENCES:
patent: 3602648 (1971-08-01), Holtz
patent: 3751602 (1973-08-01), Breeden
patent: 3823273 (1974-07-01), Beeman
patent: 3889059 (1975-06-01), Thompson
patent: 3899643 (1975-08-01), Tabalba

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