Data acquisition circuit which changes a range of a reference potential
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United States of America Patent
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Sep 5, 2006
Grant Date -
Oct 2, 2003
app pub date -
Dec 17, 2002
filing date -
Mar 27, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An A/D converter updates its reference potential so that it coincides with an analog potential of a video signal. The A/D converter changes a variable voltage range of the reference potential during the same horizontal synchronizing period based upon a horizontal synchronizing signal. It is possible to correctly discriminate data superposed on the video signal even if an analog potential of the video signal considerably varies during the same horizontal synchronizing period.
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