Robust adaptive filter for echo cancellation

Details Robust adaptive filter for echo cancellation Robust adaptive filter for echo cancellation

2006-04-18

2006-04-18

Tran, Sinh (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406090, C379S406010, C379S406050, C379S406060

Reexamination Certificate

active

07031461

ABSTRACT:
An adaptive filter is programmed with an algorithm based on a normalized Least Mean Squares (nLMS) algorithm that adapts each sample time. The algorithm is modified to be more efficient in a variety of DSPs by computing multiple errors, one per sample, before updating coefficients. The update equation utilizes the multiple errors to achieve adaptation at a similar performance to known nLMS algorithms that adapt each sample time but without the instability that is observed in low echo-to-near-end-noise ratio (ENR) input conditions. Varying the relaxation step size prevents divergence. The DSP utilizes either one or more MAC units.

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