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. 14, 1993
Filed:
Jan. 08, 1991
Applicant:
Inventor:
Kazunori Yamate, Ibaraki, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04F / ; G10H / ;
U.S. Cl.
CPC ...
368156 ; 84603 ; 331 51 ; 331 60 ; 341144 ;
Abstract
A clock producing apparatus for a D/A converter switches the clocks in accordance with the inputted sampling frequencies. A deterioration in the S/N caused by unnecessary spectra which are caused by the inputting of different sampling frequencies is prevented. The selecting operation is effected by the selecting circuit so as to obtain the selected input sampling frequencies, and at the same time, the clock signals are prevented from being inputted to the frequency dividing circuits corresponding to the input sampling frequencies which are not selected. Therefore, unnecessary spectra are prevented from being generated.