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:
Aug. 09, 1994
Filed:
Apr. 20, 1993
Applicant:
Inventors:
Assignee:
Poineer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
381103 ; 381102 ;
Abstract
A frequency control system in an audio system has a low frequency band pass filter for deriving a low frequency component from an audio signal obtained from the audio system, and a high frequency band pass filter for deriving a high frequency component. A comparator is provided for comparing the level of the high frequency component with the level of the low frequency component, thereby producing a deviation of the high frequency component from a l/f fluctuation. The audio signal is corrected with a correcting value to the l/f fluctuation dependent on the deviation.