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:
Nov. 13, 2007
Filed:
Feb. 27, 2004
Ryoji Abe, Yokohama, JP;
Ryoji Abe, Yokohama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An acoustic feedback suppression apparatus according to the present invention comprises a notch filter () for filtering out acoustic feedback components, a plurality of first sample fast Fourier transformation means (to) for performing frequency analysis of every 512 data samples, a plurality of peak frequency detecting means (to) for detecting peak frequencies of respective channels, adding means () for adding signals on the respective channels, second sample fast Fourier transformation means () for performing frequency analysis of every 4096 data samples of the added signal, peak frequency detecting means () for detecting a peak frequency of the output signal outputted from the 4096 fast Fourier transformation means (), and coefficient specifying means () for specifying filter coefficients of the notch filter ().