Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-05-15
1980-10-28
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 504
Patent
active
042310644
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.
REFERENCES:
patent: 3688037 (1972-08-01), Ipri
patent: 3691297 (1972-09-01), Merrell
patent: 3814855 (1974-06-01), Kokado
patent: 3899635 (1975-08-01), Steckler
patent: 3906155 (1975-09-01), van Straaten
patent: 4063288 (1977-12-01), Eckenbrecht
Martin John C.
Victor Company of Japan Ltd.
LandOfFree
Vertical synchronization circuit for a cathode-ray tube does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vertical synchronization circuit for a cathode-ray tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertical synchronization circuit for a cathode-ray tube will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-271568