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. 15, 1998
Filed:
Oct. 10, 1996
Mitsuru Nakamura, Hitachinaka, JP;
Noriharu Sato, Tokyo, JP;
Mitsuhide Sasaki, Hitachinaka, JP;
Hiroyuki Saito, Hitachinaka, JP;
Toshiyuki Tabata, Sagamihara, JP;
Satoshi Hasegawa, Yamato, JP;
Hitachi, Ltd., Tokyo, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
An automatic sound suppression system is automatically disengaged whenever noise in an area and generated counter noise deviate in their reverse phase relationship or if the amplitude of the counter noise deviates from that of the noise. The system can also be automatically disengaged whenever divergence prediction means predicts that sounds of the noise and the counter noise diverge or whenever divergence prediction means predict that sounds of the noise and the counter noise are about to diverge. The system can also operate as a vibration reducing apparatus which is also automatically disengaged whenever divergence prediction means predicts that a vibration and a generated countervibration diverge.