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:
Dec. 11, 1984
Filed:
Jul. 12, 1982
Antonius H Nillesen, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A synchronizing circuit arrangement for a television receiver having an oscillator which generates a clock signal the frequency of which is substantially higher than the line frequency and having a frequency dividing circuit which derives signals of the line frequency from the clock frequency by means of division. During a predetermined number of line periods a phase comparison stage determines the average value of the phase deviation between the received line synchronizing signal and a reference signal of the line frequency and applies the value obtained to a preset stage for adjusting in a subsequent time interval, for example one line period during the field blanking interval, the divisor by which the frequency dividing circuit divides the clock frequency. The clock frequency may be a multiple of the chrominance subcarrier frequency, in which case the oscillator is continuously readjusted by the phase comparison stage when the color killer circuit is operative, while the divisor is not changed.