Noise-level adaptive residual echo suppressor

Details Noise-level adaptive residual echo suppressor Noise-level adaptive residual echo suppressor

2005-10-25

2005-10-25

D'Agosta, Stephen (Department: 2683)

Telecommunications

Interference signal transmission

C455S063100, C455S067110, C455S423000, C381S071100, C708S304000, C375S229000

Reexamination Certificate

active

06959167

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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