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:
Sep. 17, 1991
Filed:
Jun. 12, 1990
Applicant:
Inventor:
Hitoshi Fuda, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
370 321 ; 379406 ; 379410 ; 379411 ;
Abstract
A method for training an echo canceller of a voice conference system, to cancel an echo by subtracting an estimated echo signal from an actual echo signal, includes the steps of: generating, at a time of a first training session, an initial echo signal and an initial training signal through feeding of a training signal to a loudspeaker and to the echo canceller; obtaining a response characteristic of the echo canceller to the echo signals; storing the initial echo signal and the initial training signal; and training the echo canceller, during subsequent training sessions, by using the stored initial echo signal and the stored training signal.