Patent ID: 6108413
Filing Date: 2000-08-22
Classification: H04M

Abstract:
An echo cancellation method, wherein a reception signal is input to an echo generator system, an observation signal is gathered from said system, the reception signal is filtered so as to produce at least one echo prediction signal for predicting an echo of the reception signal in the observation signal, and an echo prediction signal is subtracted from the observation signal so as to produce an error signal, the method comprising the steps of:decomposing the observation signal into M spectral components relating to different frequencies of the spectrum, M denoting an integer greater than 1;obtaining M corresponding spectral components of is an echo prediction signal;calculating M quantities from the spectral components of the observation signal and of the echo prediction signal, each of said M quantities 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; andcarrying out at least one spectral shaping of an error signal as a function of said M calculated quantities.