Speech circuit controlling sidetone signal by background noise l

Details Speech circuit controlling sidetone signal by background noise l Speech circuit controlling sidetone signal by background noise l

1995-06-21

1997-06-17

Zele, Krista M.

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379388, 379390, 379391, 381 57, H04M 158

Patent

active

056404506

ABSTRACT:
A speech circuit is disclosed which solves the serious problem of the degradation of the articulation of received speech voice in conventional circuits and permits pleasant communications at places where the background noise level is high. The circuit has a construction in which an input signal from a microphone is attenuated in correspondence to the background noise level to form a sidetone signal and a received speech signal from a speech channel is amplified in correspondence to the background noise level to form a new received speech signal.

REFERENCES:
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patent: 5297198 (1994-03-01), Butani et al.
patent: 5386465 (1995-01-01), Addeo et al.
patent: 5526419 (1996-06-01), Allen et al.

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