Methods and apparatus for echo suppression

Details Methods and apparatus for echo suppression Methods and apparatus for echo suppression

1997-06-24

2000-01-04

Isen, Forester W.

Telephonic communications

Echo cancellation or suppression

379399, 704219, 704233, H04B 320, H04B 7015, G10L 900

Patent

active

060118466

ABSTRACT:
In methods and apparatus for suppressing echo of a far end signal encoded using LPC-based compression in a near end signal encoded using LPC-based compression, parameters of each frame of the near end encoded signal are processed without synthesizing a speech signal from the near end encoded signal to determine whether sufficient echo to merit echo suppression is present in the frame. Upon determining that insufficient echo to merit echo suppression is present in the frame, the parameters of the frame are passed unmodified. Upon determining that sufficient echo to merit echo suppression is present in said frame, the parameters of the frame are modified without synthesizing a speech signal to suppress echo in the frame. The methods and apparatus are particularly suitable in codec bypass applications.

REFERENCES:
patent: 3991287 (1976-11-01), May, Jr. et al.
patent: 5646991 (1997-07-01), Sih
patent: 5687229 (1997-11-01), Sih
patent: 5893056 (1999-04-01), Saikaly et al.

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