SYSTEM AND METHOD FOR AVOIDING FALSE CONVERGENCE CAUSED BY PRESENCE OF TONES IN TIME-DOMAIN ECHO CANCELLATION PROCESS

PROBLEM TO BE SOLVED: To provide a system and method for avoiding a false convergence caused by a presence of tones in a time-domain echo cancellation process. SOLUTION: The system avoids the false convergence in an echo canceller, having an adaptation step size controlled to allow a set of filter t...

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Bibliographic Details
Main Author GILBERT C SIH
Format Patent
LanguageEnglish
Published 21.04.2005
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
SELECTING
TELEPHONIC COMMUNICATION
TRANSMISSION
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Summary:PROBLEM TO BE SOLVED: To provide a system and method for avoiding a false convergence caused by a presence of tones in a time-domain echo cancellation process. SOLUTION: The system avoids the false convergence in an echo canceller, having an adaptation step size controlled to allow a set of filter tap values to converge and having an adaptive filter to estimate a channel response over a whole operation frequency range. The system comprises a means for determining a spectral content of the set of filter tap values and a means for controlling the adaptation step size of the adaptive filter in response to the spectral content of the set of filter tap values. A means for controlling the adaptation step size comprises a means for reducing the adaptation step size if the spectral content indicates a condition which may cause the false convergence and a means for increasing the adaptation step size subsequent to reduce the adaptation step size. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20040346637