Speech control circuit

Details Speech control circuit Speech control circuit

1984-03-07

1985-09-17

Dwyer, James L.

179100L, H04M 160

Patent

active

045422630

ABSTRACT:
A speech control circuit comprises, associated with a transmission channel, a transmission variable gain amplifier (VGA.sub.T) coupled with the output of a microphone, a transmission signal detecting circuit (SDC.sub.T) coupled with the output of the amplifier (VGA.sub.T) for detecting signal from the microphone when the level of an amplified signal exceeds a threshold level which is switched to two levels, a first transmission time constant circuit (FTC.sub.T) for prolonging the rear edge of an output signal of the circuit (SDC.sub.T) by a first time constant .tau..sub.1, and a second transmission time constant circuit (STC.sub.T) for prolonging the rear edge of the output signal of the circuit (SDC.sub.T) by a second time constant .tau..sub.2. The speech control circuit further comprises similar elements associated with the reception channel. The transmission channel and the reception channel are coupled with a line. The first transmission time constant circuit (FTC.sub.T) controls the transmission switching circuit (SC.sub.T) inserted into a transmission channel and a reception variable gain amplifier (VGA.sub.R). The second transmission time constant circuit (STC.sub.T) controls a reception signal detecting circuit (SDC.sub.R). The first time constant .tau..sub.1 is longer than the second time constant .tau..sub.2.

REFERENCES:
patent: 3660603 (1972-05-01), Andersen
patent: 4025728 (1977-05-01), Jacobson
patent: 4052562 (1977-10-01), Andersen
patent: 4068092 (1978-01-01), Ikoma et al.

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