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:
Mar. 31, 1992
Filed:
Nov. 21, 1989
Junji Torii, Hamamatsu, JP;
Akira Usui, Hamamatsu, JP;
Lenichi Takeuchi, Hamamatsu, JP;
Masamitsu Yamamura, Hamamatsu, JP;
Yusuke Yamamoto, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A digital filter performs a predetermined arithmetic operation on input digital data inputted thereto in time-series manner by the predetermined first sampling period to thereby generate output digital data corresponding to a second sampling frequency which is N (where N denotes an integral number) times larger than the predetermined first sampling frequency. This digital filter provides a synchronizing signal generating circuit and an operation control circuit. The synchronizing signal generating circuit detects the predetermined first sampling period of the input digital data to thereby generate a synchronizing signal having the second sampling frequency. The operation control circuit is activated by its internal clock which is asynchronous with the input digital data. This operation control circuit starts to perform its operation processes when the synchronizing signal is supplied thereto, thereafter it terminates the operation processes when a predetermined step number is completed.