Apparatus and method for echo cancellation

Details Apparatus and method for echo cancellation Apparatus and method for echo cancellation

2007-02-20

2007-02-20

Harold, Jefferey F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406110, C379S406010, C379S406060

Reexamination Certificate

active

11027515

ABSTRACT:
An apparatus and method for echo cancellation that detects and tracks the active regions of the echo channel impulse response rather than the entire echo channel impulse response and uses this sparse model to cancel the echo component of the received signal. Two sets of filter coefficients are used, one to remove and track the active regions and one to detect the active regions.

REFERENCES:
patent: 5343522 (1994-08-01), Yatrou et al.
patent: 5777910 (1998-07-01), Lu
patent: 6240180 (2001-05-01), Younce et al.

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