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:
Oct. 28, 1980
Filed:
May. 15, 1979
Tomoaki Uchida, Iwai, JP;
Victor Company of Japan Ltd., Yokohama, JP;
Abstract
A vertical synchronization circuit for a cathode-ray tube comprises an oscillator for generating, in response to the horizontal synchronizing signal of an input video signal, clock pulses at twice the horizontal scanning frequency; a counter for counting the clock pulses and producing a first pulse when the pulse count reaches 525; a waveform shaping circuit receiving the vertical synchronizing signal of the input video signal and the clock pulses for producing a second pulse; a circuit for shaping the first pulse to produce a phase-comparing pulse; a phase comparator for comparing the phases of the phase-comparing pulse and the second pulse; a switching circuit controlled by the phase comparator for supplying the second pulse to the counter as a reset pulse when the phase comparator does not detect continuous coincidence during a specific vertical scanning period and for supplying the first pulse to the counter as a reset pulse when the phase detector detects continuous coincidence during the vertical scanning periods; and a circuit for shaping pulses produced by the counter in synchronism with the received vertical synchronizing signal.