Digital adaptive filter and acoustic echo canceller using...

Details Digital adaptive filter and acoustic echo canceller using... Digital adaptive filter and acoustic echo canceller using...

2005-01-11

2005-01-11

Nguyen, Duc (Department: 2643)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S395010, C379S388010, C379S388020, C379S406010, C379S406080

Reexamination Certificate

active

06842516

ABSTRACT:
To achieve an improved convergence behaviour for, e.g., echo cancellation there is provided a digital adaptive filter which includes a filter coefficient update means to successively update filter coefficients in accordance with an input signal, an estimated power of the input signal, and an error signal between the input signal filtered in the digital adaptive filter and the input signal propagated along an external path being modelled by the digital adaptive filter. Here, an input signal power estimation means is adapted to perform recursive smoothing for an increasing input power and a decreasing input power in an asymmetric fashion with different smoothing factors. In case the estimation is carried out in the frequency domain the step size for the update of filter coefficients may be calculated for each frequency band individually.

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patent: 6434110 (2002-08-01), Hemkumar

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