Echo canceller

Details Echo canceller Echo canceller

2005-05-31

2005-05-31

Nguyen, Duc (Department: 2643)

Telephonic communications

Echo cancellation or suppression

C379S406050, C379S406080, C379S406090, C379S406070, C379S406160

Reexamination Certificate

active

06901141

ABSTRACT:
An adaptive digital filter (10) is adapted to generate a pseudo echo Se which is produced by imitating a noise, using part of receiving signals Si and to output it. An echo produced through an echo path (15) is mixed, as an echo noise, with a sending signal So and this sending signal is attenuated by a level attenuator (6). The level attenuator (6), in order to match the amplitude level of the echo noise of the sending signal So to that of the pseudo echo, attenuates the sending signal So and feeds it to a subtracter (7). The subtracter (7) eliminates echo noises by subtracting the pseudo echo Se from the sending signal So. Even if the echo path is in the state of amplified system, the complete elimination of the echo can be achieved accordingly.

REFERENCES:
patent: 6212273 (2001-04-01), Hemkumar et al.
patent: 6236725 (2001-05-01), Takada et al.
patent: 362269451 (1987-11-01), None
patent: 407264279 (1995-10-01), None
patent: 08-279777 (1996-10-01), None
patent: 408279777 (1996-10-01), None

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