Speakerphone with fast idle mode

Details Speakerphone with fast idle mode Speakerphone with fast idle mode

1986-09-02

1988-02-09

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

H04M 162, H04M 910

Patent

active

047245409

ABSTRACT:
A speakerphone circuit having fast sensitive switching between the receive mode and the transmit mode is disclosed which includes circuitry for providing four point sensing at the input and output of both the transmit and receive attenuators located in the transmit and receive signal paths thereof for controlling the gains of the attenuators in a complementary manner. A logic control circuit comprising a controller circuit provides an attenuator algorithm that first detects that voice signals are present in both signal paths then quickly causes the attenuators to be set to equal gains during a fast idle mode to then allow the stronger of the two signals to set the operating mode of the speakerphone.

REFERENCES:
patent: 4513177 (1985-04-01), Nishino
patent: 4555596 (1985-11-01), Blomley

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