Adaptive filter update gain normalization

Details Adaptive filter update gain normalization Adaptive filter update gain normalization

H - Electricity

03

H

349/25, 333/53,

H03H 21/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1220823

- 19 - ADAPTIVE FILTER UPDATE GAIN NORMALIZATION Abstract Update gain normalization is employed in adaptive filters to control weighting of the filter impulse response updates in order to converge properly to a desired impulse response. Singing, i.e., oscillating, of the filter is overcome by adjusting the update gain when an incoming signal power estimate used to normalize the gain exceeds a prescribed threshold value. In one example, the normalized gain is adjusted to be a fixed value for power estimate values which exceed the threshold. In accordance with another aspect of the invention, a single normalized gain value is used to adjust the update gain in two adaptive filters employed as echo cancelers in a bidirectional voice frequency repeater.

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