Adaptive filter including a far end energy discriminator

Details Adaptive filter including a far end energy discriminator Adaptive filter including a far end energy discriminator

H - Electricity

04

L

333/51, 379/64,

H04L 1/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1169135

- 20 - ADAPTIVE FILTER INCLUDING A FAR END ENERGY DISCRIMINATOR Abstract of the Disclosure An energy discriminator is employed in conjunction with an adaptive filter to control updating of the filter transfer function characteristic. Specifically, the discriminator is employed to distinguish whether any significant received far end energy is only partial band or whole band. If the received energy is partial band the adaptive filter is inhibited from updating the transfer function characteristic during intervals that such energy is being received. On the other hand, if the received energy is determined not to be partial band and, hence, is whole band, the filter is enabled to update the transfer function characteristic during intervals that such energy is being received. In a specific example, the discriminator is employed in an adaptive echo canceler to inhibit updating an echo path estimate being generated by an adaptive transversal filter when partial band energy is being received and enabling updating of the echo path estimate when whole band energy is being received.

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