Automatic correction apparatus for video signal of digital VTR
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United States of America Patent
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-
Mar 22, 1994
Grant Date -
N/A
app pub date -
Oct 10, 1991
filing date -
Oct 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In digital VTR's, a change in levels and frequency response in the VTR analog circuits or analog transmission paths causes a problem of deterioration in the video picture quality due to quantization distortion when dubbing is repeated based on an analog video signal. In order to solve this problem, according to the present invention, a level reference signal is superposed as a predetermined digital value on an output video signal of the reproducer, then based on the reference signal, the level and the frequency response of the analog transmission path are corrected in the recorder. Thus, dubbing can be achieved by using digital VTR's without any influence of quantization distortion.
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