Fast converging affine projection based echo canceller for...

Details Fast converging affine projection based echo canceller for... Fast converging affine projection based echo canceller for...

2005-06-21

2005-06-21

Kuntz, Curtis (Department: 2643)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406010, C379S406060

Reexamination Certificate

active

06909782

ABSTRACT:
A first adaptive filter having a first filter length estimates a channel weight vector of an echo channel using an affine projection (AP) update. The echo channel receives a send input sequence and a receive input sequence. The echo channel has a plurality of sparse multi-path channels. A delay estimator determines a plurality of delays in the echo channel using the estimated channel weight vector. A second adaptive filter estimates a plurality of short weight vectors using the AP update and the plurality of delays. The short weight vectors correspond to the sparse multi-path channels. Each of the short weight vectors has a short filter length.

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