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:
Apr. 03, 2001
Filed:
Feb. 15, 2000
Applicant:
Inventors:
Kensaku Abe, Saitama, JP;
Yoshihiro Sugimoto, Tokyo, JP;
Nobuo Kobayashi, Tokyo, JP;
Kazuhisa Kito, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03C 3/06 ; H03C 3/09 ; H04H 5/00 ;
U.S. Cl.
CPC ...
H03C 3/06 ; H03C 3/09 ; H04H 5/00 ;
Abstract
The signal source of the reference frequency of a PLL,is composed of a VCO,A VCO,is provided. A first audio signal (L+R) is supplied to the VCO,so as to control its oscillation frequency f,. A second audio signal (L−R) is supplied to the VCO,so that an FM signal S,is formed whose occupied frequency band is outside the band of the first audio signal (L+R). This FM signal S,is supplied to an adder,hereby added to a phase comparison output that is supplied to a VCO,from a low-pass filter, and then supplied to the VCO