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:
Jul. 02, 1991
Filed:
Oct. 11, 1989
Yuji Nakajima, Yokohama, JP;
Toru Kita, Yokosuka, JP;
Nissan Motor Co. Ltd., Yokohama, JP;
Abstract
A system and method for canceling a periodic noise superposed on a real signal component of an original signal. The system comprises: a synchronous adaptive noise canceling filter which sequentially produces and corrects a noise component at each predetermined phase of the original signal in synchronization with a signal having a corelationship to a period of the original signal; a subtractor which subtracts the noise signal component produced by the synchronous adaptive noise canceling filter from the original signal so as to produce the real signal component as a target signal; and a signal generator which produces and sends a signal to the synchronous adaptive noise canceling filter so that the synchronous adaptive noise canceling filter produces a real periodic noise signal component without the real signal component on the basis of the signal component derived previously from the subtractor and original signal.