Echo cancellor

Details Echo cancellor Echo cancellor

2005-01-04

2005-01-04

Nguyen, Duc (Department: 2643)

Telephonic communications

Echo cancellation or suppression

C379S406040, C379S406080, C379S406050

Reexamination Certificate

active

06839426

ABSTRACT:
An echo cancellor having a main tap coefficient holding section to renew a tap coefficient used to establish a pseudo transmission characteristic of an echo path and a sub tap coefficient holding section to make a copy of a tap coefficient held by the main tap coefficient holding section and to hold it. The copying is made each time an echo suppressing rate is increased. Accordingly, a tap coefficient having a high echo suppressing rate is held by the sub tap coefficient holding section. In this state, if an ambient noise such as an alarm of whistle of a vehicle is mixed, renewal operation of the main tap coefficient holding section is halted and a tap coefficient held by the sub tap coefficient holding section is used. Even in the case of a divergence of the main tap coefficient, normal operation can be maintained by the tap coefficient held by the sub tap coefficient holding section accordingly.

REFERENCES:
patent: 5007044 (1991-04-01), Miyoshi et al.
patent: 5828589 (1998-10-01), Degenhardt
patent: 6212273 (2001-04-01), Hemkumar et al.

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