Echo canceller with dynamically positioned adaptive filter taps

Details Echo canceller with dynamically positioned adaptive filter taps Echo canceller with dynamically positioned adaptive filter taps

H - Electricity

04

B

340/72

H04B 3/23 (2006.01)

Patent

CA 1273075

ABSTRACT An echo canceller according to the present invention includes means for storing an impulse response in a memory, the impulse response being indicative of the characteristics of a transmission line. It also includes means for detecting ranges of samples within the impulse response having relatively large distribution of echo energy, these ranges of samples of relatively large distribution of echo energy being indicative of echoes on the transmission line. An echo canceller includes a digital filter having a plurality of weighted taps, each of the weighted taps having an associated tap weight value. A tap allocation circuit establishes the tap weight values in response to said detecting means so that only taps within the regions of relatively large distributions of echo energy are turned on. The ranges of echo energy are detected coarsely by detecting ranges of samples having relatively high estimated average echo power. The echo is more finely located by computing the center of gravity and radius of gyration of the echo energy within the coarsely located ranges of samples.

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