Noise-level adaptive residual echo suppressor
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United States of America Patent
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Oct 25, 2005
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N/A
app pub date -
Aug 10, 2001
filing date -
Aug 11, 2000
priority date (Note) -
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Abstract
An improved echo control system has an adaptive controlled echo canceling filter arrangement in which a background filter updates the filter coefficients of an echo shaping filter responsive to a normalized least mean square (NLMS) algorithm. An adaptive control module determines a weighted reference signal for the background filter in which the weight is proportional to a far signal reference and an estimate of the norm of an echo canceller error vector, and inversely proportional to en estimate of a residue of the echo canceller. And a non-linear normalized convergence term is used in the NLMS algorithm.
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