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. 18, 2014
Filed:
Apr. 15, 2009
Yoshiki Ohta, Sakado, JP;
Yoshitomo Imanishi, Fujimi, JP;
Tomomi Hasegawa, Kawasaki, JE;
Manabu Nohara, Turugashima, JP;
Yusuke Soga, Kawasaki, JP;
Yoshiki Ohta, Sakado, JP;
Yoshitomo Imanishi, Fujimi, JP;
Tomomi Hasegawa, Kawasaki, JE;
Manabu Nohara, Turugashima, JP;
Yusuke Soga, Kawasaki, JP;
Pioneer Corporation, Kanagawa, JP;
Abstract
An active vibration noise control device having a pair of speakers, including: a basic signal generating unit generating a basic signal based on a vibration noise frequency; an adaptive notch filter generating a first control signal provided to one speaker using a first filter coefficient and generating a second control signal provided to the other speaker using a second filter coefficient to cancel the generated vibration noise; a microphone detecting cancellation error between the vibration noise and the control sounds and outputting an error signal; a reference signal generating unit generating a reference signal based on a transfer function from the speakers to the microphone; a filter coefficient updating unit updating first and second filter coefficients, minimize the error signal; and a phase difference limiting unit limiting a phase difference between control sounds generated by different speakers. Therefore, it becomes possible to appropriately ensure a uniform and wide noise-cancelled area.