Telephone receiver circuit with dynamic sidetone signal...

Details Telephone receiver circuit with dynamic sidetone signal... Telephone receiver circuit with dynamic sidetone signal...

2005-02-01

2005-02-01

Isen, Forester W. (Department: 2644)

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

C379S392000, C379S392010, C379S418000

Reexamination Certificate

active

06850617

ABSTRACT:
A telephone receiver circuit with sidetone signal generation controlled by voice activity detection in accordance with the present invention uses the voice activity detector (VAD) to detect the presence of voice activity within the microphone signal and dynamically adjust the sidetone signal generation to compensate for noisy environments by eliminating or reducing the sidetone signal in the absence of voice activity. Hence, a sidetone signal is generated in the presence of voice activity, when feedback is required, while the sidetone signal is not generated in the absence of voice activity, since audio feedback for the user is not required then.

REFERENCES:
patent: 5893034 (1999-04-01), Hikuma et al.
patent: 5946391 (1999-08-01), Dragwidge et al.
patent: 6041118 (2000-03-01), Michel et al.

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