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:
Feb. 11, 2003
Filed:
Sep. 29, 1999
Kiyoshi Yajima, Saitama-ken, JP;
Satoshi Kumada, Saitama-ken, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
There is provided an audio system which suppresses standing waves. An audio signal source ( ) outputs audio signals (S ) and (S ) which are then supplied to reproducing loudspeakers ( ) and ( ),installed in a room ( ), where the reproduced sounds are outputted. Furthermore, the audio signals (S ) and (S ) are added at an adder ( ) to obtain signal (S2) which is in turn filtered by a compensating filter and then inverted by means of an inverting circuit ( ). This generates a compensation signal (Sc) with a phase opposite to that of the standing wave. The compensation signal (Sc) is supplied to a compensating loudspeaker ( ) installed in the room ( ), whereby sound for canceling out the standing wave is outputted. The compensating filter has its frequency characteristics set in accordance with the cross-correlation function between a transfer function from the reproducing loudspeakers, ( ) and ( ), to a listening location and a transfer function from the compensating loudspeaker ( ) to the listening location.