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:
Jul. 19, 1988
Filed:
Jun. 25, 1987
Applicant:
Inventor:
Masumi Ogawa, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
329140 ; 329124 ; 329142 ; 455187 ; 455191 ;
Abstract
A discriminator for a plurality of sound intermediate frequencies which are different from each other includes a plurality of selectively operable resonance circuits each of which is formed of a winding of a respective fixed inductance value and a capacitor of a fixed capacitance value, and any deviation of the tuned frequency of a selected resonance circuit is corrected by a variable reactance element which is common to all of the resonance circuits, to thereby remove the necessity of individual adjustments, simplify the circuit configuration, and decrease the cost thereof.