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:
May. 09, 1995
Filed:
Feb. 12, 1993
Applicant:
Inventor:
Hideki Yumoto, Streamwood, IL (US);
Assignee:
Matsushita Electric Corporation of America, Secaucus, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
381-1 ; 381 28 ; 381 63 ; 381 24 ;
Abstract
A circuit for directly differentiating stereo and mono signals regardless of whether a pilot carrier signal is present. The circuit generally includes a detection circuit coupled to a control circuit. The detection circuit subtracts the left and right audio signals, and the control circuit compares the resulting difference to a reference signal. When the reference signal exceeds the difference between the left and right signals, the control circuit judges that the inputs are mono. The circuit is advantageously used to automatically disable a repercussion function of a stereo system when a mono signal is received.