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. 21, 1988
Filed:
Jun. 05, 1986
Jorg Wolber, Pinneberg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit arrangement for a video recorder comprises a modulator (5) for modulating a chrominance signal from a first onto a second carrier wave by means of a third carrier wave. In order to generate the third carrier wave a first mixer (39) is coupled to a reference oscillator (18) and to a first voltage-controlled oscillator (23). A control signal from a phase-comparator circuit (15), which compares the frequency and phase of the burst signal with these of the first oscillator signal, and a control signal from a phase-comparator circuit (30) of a phase-locked loop in which a second voltage-controlled oscillator (27) is synchronized with the line synchronizing pulses, are applied to the first voltage-controlled oscillator (23). The two voltage-controlled oscillators are substantially identical and have a fixed frequency ratio with each other.