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, 1978
Filed:
Sep. 22, 1976
Applicant:
Inventors:
Assignee:
Victor Company of Japan, Ltd., Yokohama, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; H03D / ;
U.S. Cl.
CPC ...
1791 / ; 179 / ; 1791 / ; 329122 ;
Abstract
A multichannel record disc reproducing system comprises at least two phase-locked loops. Each loop includes a phase comparator and a voltage-controlled oscillator for respectively demodulating an angle-modulated signal which is separated from a signal picked up from a multichannel record disc. The picked up signal includes a direct-wave signal and an angle-modulated signal which were multiplexed and recorded. An addition circuit adds the demodulated output signals of the phase-locked loops. The respective phase-locked loops have different lock ranges in order to exclude noise and other distortion.