Video signal transmission method, superimposed information extraction method, video signal output device, video signal recording device, and video signal recording medium
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United States of America Patent
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Mar 12, 2002
Grant Date -
N/A
app pub date -
Dec 3, 1997
filing date -
Dec 10, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A output device generates a PN code string every second chip interval with reference to the video sync signal, and spectrally spreads additional information using this PN code string. The spectrally spread additional information is superimposed on the video signal every second chip interval and output. Upon receiving the video signal, in the recording device for recording the video signal on a recording medium, the video signal components cancel each other between the video signal component in the chip interval on which the additional information is superimposed and the video signal component in the chip interval on which the additional information is not superimposed because of the correlation of the video signal in the horizontal direction, and only the additional information is extracted.
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