ECHO CANCELLATION METHOD AND ECHO CANCELLER IMPLEMENTING SUCH A PROCESS

摘要

A reception signal (x(n)) is input to an echo generator system (1). An observation signal (z(n)) is gathered from the system. The reception signal is filtered to produce an echo prediction signal (y(n)). The echo prediction signal is subtracted from the observation signal to produce an error signal (e(n)). The observation signal (z(n)) is decomposed into M spectral components relating to different frequencies of the spectrum. M corresponding spectral components of the echo prediction signal (y(n)) are obtained. M quantities, each having a value with progressive variation representative of a degree of similitude between, respectively, one of the M spectral components of the observation signal and the corresponding spectral component of the echo prediction signal, are calculated. At least one spectral shaping of the error signal (e(n)) is carried out as a function of these M calculated quantities so as to adapt the filtering and/or to deliver the output signal from the echo canceller.