Apparatus using comparator to detect drop-out of recorded video

Details Apparatus using comparator to detect drop-out of recorded video Apparatus using comparator to detect drop-out of recorded video

1991-10-29

1993-06-29

Chin, Tommy

Facsimile and static presentation processing

Facsimile

Recording apparatus

358314, 360 381, H04N 594

Patent

active

052239462

ABSTRACT:
A drop-out detecting apparatus comprises an amplitude detecting circuit supplied with a high frequency video signal reproduced from a record medium, a first smoothing circuit supplied with a detected output of the amplitude detecting circuit and having a short time constant so that it produces an output having a drop-out, a second smoothing circuit supplied with the detected output of the amplitude detecting circuit and having a long time constant so that it produces an output having no drop-out, a detecting circuit for level-comparing a smoothed output of the second smoothing circuit and a first reference level to produce an output of large or small level, and a comparing circuit for level-comparing a smoothed output of the first smoothing circuit and a second reference level provided by attenuating the detected output of the detecting circuit by a predetermined attenuating ratio, wherein the comparing circuit derives a drop-out detecting signal.

REFERENCES:
patent: 4032966 (1977-06-01), Kenney et al.
patent: 4245262 (1981-01-01), Ohtsu
patent: 4438467 (1984-03-01), Schaller et al.
patent: 4847709 (1989-07-01), Uehara et al.
patent: 4893192 (1989-01-01), Takemura
patent: 4977461 (1990-12-01), Ichimura
patent: 5032915 (1991-07-01), Ichimura
patent: 5050002 (1991-09-01), Suzuki et al.

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