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:
Jan. 07, 1997
Filed:
Dec. 06, 1994
Akira Miyashita, Tokorozawa, JP;
Takaaki Ashinuma, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is an information reproducing apparatus having a first comparator for comparing a reproduction signal from an information recording medium such as a magnetooptical disc and a first reference signal, thereby binarizing the reproduction signal, a clock signal generating circuit for generating a clock signal from the signal binarized by the first comparator, and a synchronous circuit for synchronizing the binary signal by the clock signal. A phase comparator compares the phase of the binary signal and the phase of the output of the synchronous circuit, a charge/discharge circuit such as a charge pump circuit is driven by an output of the phase comparator, and a second comparator compares an output of the charge/discharge circuit and a second reference signal. The first reference signal is controlled by an output of the second comparator synchronously with the binary signal or the output of the synchronous circuit. The second reference signal changes interlockingly with a change in frequency of the clock signal forming circuit.