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:
Aug. 08, 2000
Filed:
Dec. 18, 1998
Jeroen H Stessen, Eindhoven, NL;
Age J Van Dalfsen, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A time-discrete phase-locked loop includes a discrete time oscillator (DTO) which supplies a periodical oscillator signal (OS) representing oscillator values (OV) at corresponding clock instants (TC) of a clock signal (CLK). A position-determining circuit (P) generates a time-discrete synchronization instant (SI) representing a position of an analog synchronizing pulse (SP) of a video signal with sub-clock period accuracy. A phase detector (PD) determines a phase error (PE) between the discrete time oscillator signal (OS) and the synchronization instant (SI) by using the synchronization instant (SI), a value (OV1) of the discrete time oscillator signal (OS) at a clock instant (TC1) related to the synchronization instant (SI), and the slope of the oscillator signal (OS). A period of the oscillator signal (OS) depends on the phase error (PE). By using the slope of the oscillator signal (OS), the phase error (PE) is independent of this slope.