Telephone set with background noise suppression function

Details Telephone set with background noise suppression function Telephone set with background noise suppression function

1994-12-20

1998-05-05

Hofsass, Jeffery

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379389, 379406, 379410, 381 71, 381 94, H04M 100, G10K 1116

Patent

active

057487251

ABSTRACT:
A telephone set is provided with a first microphone at the position close to a speaker and a signal including remaining noise is outputted from the first microphone. Background noise is outputted from a second microphone. A noise elimination circuit estimates background noise reaching the ear of a receiver based on the background noise signal, the signal including the remaining noise, and a received voice signal from a transmitter. Also, the noise elimination circuit subtracts the estimated background noise from the received voice signal to supply the resultant signal to the speaker.

REFERENCES:
patent: 5121426 (1992-06-01), Baumhauer, Jr. et al.
patent: 5251263 (1993-10-01), Andrea et al.
patent: 5323458 (1994-06-01), Park et al.
patent: 5381473 (1995-01-01), Andrea et al.
patent: 5521263 (1996-05-01), Andrea et al.

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