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:
Jun. 01, 2004
Filed:
Oct. 05, 1999
Applicant:
Inventors:
Alberto D. Berstein, Cupertino, CA (US);
Abraham Wei, Saratoga, CA (US);
Tom Wei, San Jose, CA (US);
Assignee:
Zhone Technologies, Inc., Oakland, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 9/08 ; H04B 3/23 ;
U.S. Cl.
CPC ...
H04M 9/08 ; H04B 3/23 ;
Abstract
A system and method of Acoustic Echo Cancellation includes a digital filter used to estimate the echo path is split into 2 filters: one fixed infinite impulse response (IIR) filter and one adaptive finite impulse response (FIR) filter. The fixed filter models the composite frequency response of the loudspeaker, its cabinet enclosure and the direct coupling path between the loudspeaker and the microphone(s). The adaptive filter models the time varying characteristics of the indirect coupling path between the loudspeaker and microphone.