Method and apparatus for improving the quality of a transmitted video signal
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United States of America Patent
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N/A
Issued Date -
Mar 5, 2009
app pub date -
Aug 29, 2007
filing date -
Aug 29, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A feedback circuit for restoration of DC reference levels in video signals is presented. In one or more embodiments, a DC sample pulse is generated representing the back porch of an incoming video signal. A sample and hold circuit, which is controlled by the DC sample pulse, obtains the correct offset voltage in the output signal during this back porch period. The offset voltage feeds back through an integrating node in front of the circuit causing an amplifier to compensate for the signal offset thereby restoring the video signal to its proper DC voltage level with respect to ground.
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