Echo canceller having improved noise immunity

Details Echo canceller having improved noise immunity Echo canceller having improved noise immunity

2006-05-02

2006-05-02

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406030, C379S406080

Reexamination Certificate

active

07039182

ABSTRACT:
Methods and systems pertaining to preventing the corruption of filter coefficients due to near end speech in an echo canceller that uses an adaptive filter to create a local replica of an echo signal are provided. In accordance with a preferred method, a far end signal is received and the presence of near end speech is indicated. A filter coefficient vector is updated, and copies of the filter coefficient vector are periodically stored. A stored copy of the filter coefficient vector is recovered for use in the echo canceller. Further, an improved echo canceller that prevents the corruption of filter coefficients due to near end speech, having a near end speech indicator, a first buffer, a filter, and a second buffer connected to the filter, is provided. The first buffer receives a far end signal. The filter is responsive to the first buffer and the near end speech indicator. The filter includes a filter coefficient vector generator, wherein the generator generates, updates, and provides copies of filter coefficient vectors. The second buffer is connected to the filter and stores the copies of the filter coefficient vectors for restoration to the filter.

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