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:
Jul. 27, 2010
Filed:
Mar. 27, 2006
Wan-chieh Pai, San Jose, CA (US);
Ming Zhang, Cupertino, CA (US);
Wan-Chieh Pai, San Jose, CA (US);
Ming Zhang, Cupertino, CA (US);
Fortemedia, Inc., Cupertino, CA (US);
Abstract
Techniques for performing acoustic echo cancellation are described. An ADC oversamples an analog signal from a microphone and provides a near-end signal having a wider bandwidth than the bandwidth of a communication channel. A subband filter receives and filters the near-end signal, provides an in-band signal having spectral components in a frequency band of interest, and provides an out-of-band signal having spectral components in at least one other frequency band. An adaptive filter receives a reference signal and the in-band signal, derives an echo estimate signal with the reference signal, cancels a portion of the echo in the in-band signal with the echo estimate signal, and provides an intermediate signal. A double-talk detector detects for double talk based on the out-of-band signal and the intermediate signal, e.g., by determining a power ratio based on the powers of the out-of-band and intermediate signals and detecting for double talk based on the power ratio.