Self-adaptive trans-hybrid balance filter

Details Self-adaptive trans-hybrid balance filter Self-adaptive trans-hybrid balance filter

1996-02-23

1998-10-27

Moise, Emmanuel L.

Boots, shoes, and leggings

364724011, 379402, 379403, 379404, G06F 1710, H04M 100, H04M 900, H04M 908

Patent

active

058285890

ABSTRACT:
An adaptive balance filter includes a transmission path, a reception path, and an adaptive filter having a signal output, a coefficient output for outputting filter coefficients, an error signal input, and a signal input coupled to the transmission path. There is a main filter which has a signal output, a signal input coupled to the transmission path, and a coefficient input terminal. There is also a first subtractor which has one input coupled to the reception path, another input coupled to the signal output of the main filter, and an output forming a further course of the reception path. A second subtractor has one input coupled to the reception path, another input coupled to the signal output of the adaptive filter, and an output coupled to the error signal input of the adaptive filter. A transfer device is connected between the adaptive filter and the main filter and has a control input for loading the filter coefficients of the adaptive filter into the main filter upon command of a corresponding copy signal. A transfer control device having first, second and third inputs is provided. The transfer control device ascertains echo attenuations of the adaptive filter and the main filter from the first, second and third inputs, comparing two echo attenuations with one another, and sending a corresponding copy signal to the transfer device in the event that the echo attenuation of the adaptive filter is higher than the echo attenuation of the main filter.

REFERENCES:
patent: 5138568 (1992-08-01), Gazsi et al.
patent: 5146470 (1992-09-01), Fujii et al.
patent: 5233550 (1993-08-01), Gazsi
patent: 5278780 (1994-01-01), Eguchi
patent: 5315621 (1994-05-01), Lucioni et al.
patent: 5586180 (1996-12-01), Degenhardt et al.
Publ. "CMOS Subsriber Line Audio Processing Circuit Including Adaptive Balance", (Poole et al.), 1988.
Publication Widrow/Stearns, 1985, pp. 99-295, "Adaptive Signal Processing".

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