Subband acoustic echo canceller

Details Subband acoustic echo canceller Subband acoustic echo canceller

1996-10-15

1998-02-24

Zele, Krista

Telephonic communications

Echo cancellation or suppression

379345, 379410, 379411, 3647241, 36472419, H04M 900, G06F 1760

Patent

active

057217726

ABSTRACT:
In a subband acoustic echo canceller, FG/BG filters are provided in M ones of N subbands into which the received signal is divided, and adaptive filters are provided in the other remaining subbands. In the respective FG/BG filters, during the detection of a non-double-talk state their transfer logic parts output state signals GD-j, GD-k, . . . and their adaptive operation control parts each apply an adaptation condition signal ADP to the adaptive filter in each of the above-mentioned other remaining subbands when a predetermined number or more of the FG/BG filters output the state signals GD-j, GD-k, . . . The adaptive filter updates the subband estimated echo path coefficient only when it is supplied with the signal ADP.

REFERENCES:
patent: 4757527 (1988-07-01), Beniston et al.
patent: 5272695 (1993-12-01), Makino et al.
patent: 5329587 (1994-07-01), Morgan et al.
patent: 5535149 (1996-07-01), Mori et al.
patent: 5548642 (1996-08-01), Diethorn
patent: 5566167 (1996-10-01), Duttweiler
patent: 5644596 (1997-07-01), Sih

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