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:
Sep. 04, 2012
Filed:
Nov. 06, 2008
Hiraku Okumura, Hamamatsu, JP;
Hiraku Okumura, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
In an audio processing apparatus, a signal processor controls a volume of a sound signal provided to a sound emitting device. An adaptive filter determines an adaptive signal so as to minimize a magnitude of an error signal. A subtractor generates the error signal represented by a difference between the adaptive signal and an observation signal generated by a sound receiving device. A magnitude ratio calculator calculates a magnitude ratio of the observation signal relative to the error signal or a magnitude ratio of the adaptive signal relative to the error signal for each frame that is sequentially segmented from the error signal along a time axis. A controller variably controls a gain of the volume of the sound signal according to the magnitude of the error signal and the magnitude ratio.