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. 21, 2011
Filed:
Nov. 05, 2007
Shawn X. Gao, Cerritos, CA (US);
Sigfrid D. Soli, Sierra Madre, CA (US);
Hsiang-feg Chi, Los Angeles, CA (US);
Shawn X. Gao, Cerritos, CA (US);
Sigfrid D. Soli, Sierra Madre, CA (US);
Hsiang-Feg Chi, Los Angeles, CA (US);
House Research Institute, Los Angeles, CA (US);
Abstract
An improved method for adaptively cancelling acoustic feedback in hearing aids and other audio amplification devices. Feedback cancellation is limited to a frequency band that encompasses all unstable frequencies. By limiting the bandwidth of the feedback cancellation signal, the distortion due to the adaptive filter is minimized and limited only to the unstable feedback regions. A relatively simple signal processing algorithm is used to produce highly effective results with minimal signal distortion.