System for eliminating acoustic feedback

Details System for eliminating acoustic feedback System for eliminating acoustic feedback

2000-09-09

2009-11-03

Kuntz, Curtis (Department: 2614)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S094300

Reexamination Certificate

active

07613529

ABSTRACT:
A method and system is provided for eliminating acoustical feedback in a system. The method determines a parameter for at least one notch filter, adjusting the notch filter based on the parameter, processing the digital signals through the notch filter, testing at the effect of the notch filter in the system, and removing the notch filter if the notch filter is not effective. Also disclosed is a method and system of selecting candidate frequencies which might be feedback, as opposed to other wanted sound frequencies. The selection method sampling the digital signals, converting the time domain digital signal samples by a fast Fourier transform algorithm into the frequency domain, using a ballistics approach to find prominences in the frequency spectrum, and testing the sizes of the prominences.

REFERENCES:
patent: 4079199 (1978-03-01), Patronis, Jr.
patent: 4091236 (1978-05-01), Chen
patent: 4165445 (1979-08-01), Brosow
patent: 4232192 (1980-11-01), Beex
patent: 4238746 (1980-12-01), McCool et al.
patent: 4382398 (1983-05-01), O'Neill
patent: 4449237 (1984-05-01), Stepp et al.
patent: 4493101 (1985-01-01), Muraoka et al.
patent: 4602337 (1986-07-01), Cox
patent: 4620069 (1986-10-01), Godwin et al.
patent: 4630304 (1986-12-01), Borth et al.
patent: 4649505 (1987-03-01), Zinser, Jr. et al.
patent: 4658426 (1987-04-01), Chabries et al.
patent: 4817160 (1989-03-01), De Koning et al.
patent: 5027410 (1991-06-01), Williamson et al.
patent: 5029217 (1991-07-01), Chabries et al.
patent: 5046101 (1991-09-01), Lovejoy
patent: 5245665 (1993-09-01), Lewis et al.
patent: 5442712 (1995-08-01), Kawamura et al.
patent: 5506910 (1996-04-01), Miller et al.
patent: 5677987 (1997-10-01), Seki et al.
patent: 5710823 (1998-01-01), Nagata et al.
patent: 5717772 (1998-02-01), Lane et al.
patent: 5748751 (1998-05-01), Janse et al.
patent: 5910994 (1999-06-01), Lane et al.
patent: 5912880 (1999-06-01), Bernstein
patent: 5941940 (1999-08-01), Prasad et al.
patent: 5999631 (1999-12-01), Porayath et al.
patent: 6058194 (2000-05-01), Gulli et al.
patent: 6058198 (2000-05-01), Aceti et al.
patent: 6125187 (2000-09-01), Hanajima et al.
patent: 6539096 (2003-03-01), Sigwanz et al.
patent: 6690805 (2004-02-01), Tsuji et al.
patent: 2004/0120535 (2004-06-01), Woods
patent: 198 14 180 (1999-10-01), None
patent: 1 298 643 (2003-04-01), None
patent: WO 01/97212 (2001-12-01), None

Affiliated with

Also associated with

Rating

System for eliminating acoustic feedback does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for eliminating acoustic feedback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for eliminating acoustic feedback will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4082681