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:
Jun. 20, 1989
Filed:
Dec. 24, 1987
Applicant:
Inventors:
Yoshihiro Yamamoto, Tokyo, JP;
Tsutomu Kume, Ibaraki, JP;
Nobuo Yamazaki, Tokyo, JP;
Fumiharu Hashimoto, Tokyo, JP;
Koichi Ohya, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; H03F / ;
U.S. Cl.
CPC ...
364572 ; 328167 ; 330294 ; 36457101 ; 36472402 ; 375 13 ;
Abstract
A filter adjustment apparatus adjusts the properties of a filter by changing, for example, the circuit constants of a filter connected in series with a signal processing circuit to correspond with desired optimum properties of the filter. The state of the signal processing circuit is changed to a state not affecting the filter adjustment, to thereby eliminate the influence of the signal processing circuit on the filter characteristics, to facilitate and increase precision of the filter adjustment.