Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-10-10
1994-03-22
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358340, 348691, H04N 516
Patent
active
052969290
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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Groody James J.
Matsushita Electric - Industrial Co., Ltd.
Murrell Jeffrey S.
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