Full-duplex communication device and method of acoustic echo...

Details Full-duplex communication device and method of acoustic echo... Full-duplex communication device and method of acoustic echo...

2007-07-27

2010-10-12

Sing, Simon (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C370S290000

Reexamination Certificate

active

07813498

ABSTRACT:
The invention provides a full-duplex communication device. In one embodiment, the full-duplex communication device comprises a first adaptive filter, a second adaptive filter, a channel decoupling module, and a frequency processing module. The first adaptive filter having a first tap length filters out echoes of a far-end talker from a first near-end signal carrying voices of a near-end talker according to a far-end signal carrying voices of the far-end talker to obtain a second near-end signal. The second adaptive filter having a second tap length less than the first tap length filters out echoes of the far-end talker from the first near-end signal according to the far-end signal to obtain a third near-end signal. The channel decoupling module processes the second near-end signal to generate a fourth near-end signal and subtracts the second near-end signal from the third near-end signal to obtain a fifth near-end signal. Finally, the frequency processing module cancels echoes of the far-end talker from the fourth near-end signal in frequency domain according to the fifth near-end signal to obtain a six near-end signal.

REFERENCES:
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patent: 6700977 (2004-03-01), Sugiyama
patent: 7177416 (2007-02-01), Zhang et al.
patent: 2007/0280472 (2007-12-01), Stokes III et al.
patent: 2009/0003586 (2009-01-01), Lai et al.
patent: WO 2006040734 (2006-04-01), None
patent: WO 2007077536 (2007-07-01), None

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