Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1988-04-28
1991-09-03
Envall, Jr., Roy N.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358323, 358327, H04N 989
Patent
active
050459503
ABSTRACT:
An improved jitter detecting method and an apparatus thereof, for detecting jitter generated in a reproduced video signal of a VTR or video disc wherein a frequency-modulated carrier of a video signal is recorded by synchronizing the leading edge of a sync signal with the phase of the forefront carrier of a constant frequency carrier train corresponding to a sync tip for every horizontal period at the time of frequency-modulation. From the reproduced frequency-modulated carrier, the phase-reset constant frequency carrier train is utilized as a reference burst signal, thereby to be capable of removing a time-base error by detecting a specific zero-crossing timing of the carrier burst through a bandpass filter based on the trailing edge of a frequency-modulated sync signal during reproduction.
REFERENCES:
patent: 4005473 (1977-01-01), Hjortzberg
patent: 4034397 (1977-07-01), Trost
patent: 4393418 (1983-07-01), Kimura
patent: 4422103 (1983-12-01), Kanamaru
patent: 4616270 (1986-10-01), Nishimoto
patent: 4704639 (1987-11-01), Yamanishi et al.
patent: 4916548 (1990-04-01), Morioka et al.
Ishikawa Masakazu
Iwamura Soichi
Koide Naoki
Murakami Satoshi
Envall Jr. Roy N.
Sharp Kabushiki Kaisha
Young W. R.
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