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. 29, 1999
Filed:
Oct. 06, 1997
Shoji Shiomoto, Tokyo, JP;
Hirofumi Yuchi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A PCR is detected from a bit stream by a PCR extracting circuit. When the time reference value is detected, an STC counter counts a clock oscillated by a VCO and compares the value of the STC counter and the value of the PCR. The phase difference is fed back to the VCO through a digital filter. In the control start stage, the gain of the digital filter is designated to a large value. Thus, the phase difference is quickly converged to the allowable difference range. In the lock stage, the gain is designated to a small value. Thus, the control operation is stably performed. In the nearly unlock stage, the gain is designated to a middle value. Thus, the phase difference is quickly pulled to the allowable difference range.