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United States of America Patent
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Nov 11, 1986
Grant Date -
N/A
app pub date -
Dec 17, 1984
filing date -
Jul 10, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system which detects the operation of a video tape recorder to obtain data related to the operation of the video tape recorder. The system is also capable of determining the dubbing condition of the video tape recorder over the recording of an ordinary broadcast. The system further determines the receiving channel of the video tape recorder or the television set by directly comparing video signals.
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