The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2000
Filed:
Jan. 15, 1998
Francedilla.ois Capman, Versailles, FR;
Jerome Boudy, Fontenay le Fleury, FR;
Matra Communication, , FR;
Abstract
A reception signal is input to an echo generator system. An observation signal is gathered from the system. The reception signal is filtered to produce an echo prediction signal. The echo prediction signal is subtracted from the observation signal to produce an error signal. The observation signal is decomposed into M spectral components relating to different frequencies of the spectrum. M corresponding spectral components of the echo prediction signal 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 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.