Quadrature filter augmentation of echo canceler basis functions

Details Quadrature filter augmentation of echo canceler basis functions Quadrature filter augmentation of echo canceler basis functions

H - Electricity

04

B

H04B 3/23 (2006.01)

Patent

CA 2317982

An echo canceler has its otherwise conventional tapped delay line basis functions augmented with at least one pair of basis functions realizing two quadrature responses of a complex pole. The frequency of this complex pole is selected as substantially equal to the frequency of the dominant pole of a highpass filter inserted into the echo path of the echo canceler, where the dominant pole is the pole closest to the unit circle. This echo canceler arrangement results in a substantial improvement in attainable echo-return- loss enhancement.

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