Circuit for reducing drop-out errors in a video signal derived f

Details Circuit for reducing drop-out errors in a video signal derived f Circuit for reducing drop-out errors in a video signal derived f

1979-05-23

1981-10-06

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358127, 360 36, 360 38, H04N 576, H04N 5795

Patent

active

042938694

ABSTRACT:
A device for producing a switching pulse used to compensate for dropout in a video signal received from a recording apparatus and for compensation of time error in the video signal, comprising, a manipulated variable producing device within the recording apparatus, a transit time section having an input connected to the recording apparatus for receiving the video signal produced thereby and the manipulated variable and a dropout recognition device having an input connected to the recording apparatus for receiving the video signal and an output connected to the input of the transit time section. The dropout recognition device produces a flag signal which corresponds to a dropout which may occur in the video signal. The output of the dropout recognition means containing the flag signal is connected to a first switching device which, in turn, is connected to the input of the transit time section for forming a marking pulse which has the duration of the flag signal in the video signal. A second switching device is connected at the output of the transit time section for sensing the marking pulse and producing the switching pulse which is time-corrected and used for impressing an equivalent voltage in the video signal to replace the dropout therein.

REFERENCES:
patent: 3947873 (1976-03-01), Buchan
patent: 4054903 (1977-10-01), Ninomiya
patent: 4063284 (1977-12-01), Tatami
patent: 4081826 (1978-03-01), Ninomiya

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