Hands-free communication unit having residual acoustic echo supp

Details Hands-free communication unit having residual acoustic echo supp Hands-free communication unit having residual acoustic echo supp

1996-04-19

1999-04-13

Bost, Dwayne

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379389, 379390, 379406, 379410, 381 57, 381 94, H04M 100

Patent

active

058945130

ABSTRACT:
An acoustic echo suppression circuit is provided in a hands-free communication unit. The suppression circuit includes a variable loss circuit which is responsive to noise detection circuits. If the acoustic echo canceler fails to remove all environmental noise, the detection circuits enable the variable loss circuit to suppress the residual noise.

REFERENCES:
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 4543665 (1985-09-01), Sotelo et al.
patent: 4894820 (1990-01-01), Miyamoto et al.
patent: 4912758 (1990-03-01), Arbel
patent: 4959857 (1990-09-01), Erving et al.
patent: 5099472 (1992-03-01), Townsend et al.
patent: 5131032 (1992-07-01), Esaki et al.

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