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. 09, 1987
Filed:
Oct. 20, 1983
Shohei Yamazaki, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A clock signal reproducing circuit for a player reproducing information of a disc reproduces a clock signal from a signal reproduced from a disc via a pickup head. The clock signal reproducing circuit comprises clock signal generating circuit for generating a clock signal having a period of about 1/n (n being an integer) of the signal reproduced from the disc, a first detecting circuit which, in response to the signal reproduced from the disc via the pickup head and the clock signal delivered from the clock signal generating circuit, detects a phase error between the two signals containing a component for 1/2 period of the clock signal, a second detecting circuit which, in response to the clock signal delivered from the clock signal generating circuit, detects the component for 1/2 period of the clock signal at a timing when the first detecting circuit detects the phase error, and a combinating circuit which cancels the component for 1/2 period of the clock signal by combining output signals of the first and second detecting circuits thereby to provide only the phase error component. A phase locked loop is operated in response to this phase error component such that the clock signal and the input signal reproduced from the disc are in phase with each other.