High speed analog color key detection technique and system
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United States of America Patent
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Jan 2, 2001
Grant Date -
N/A
app pub date -
Apr 25, 1997
filing date -
Apr 25, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A high speed analog color key detection system is disclosed for video/graphics mixing that employs a high speed analog strobe comparator to compare the analog version of a pre-defined color key value to the stream of pixel values in an incoming analog graphics signal. When the comparator indicates a match, the display signal is switched from the analog graphics signal to an incoming analog video signal, enabling the analog video signal to be displayed within a graphics window. Comparisons are triggered by active transitions of a strobe signal with a frequency that is an integer k multiple of the frequency at which the pixel values are generated by a graphics card. Oversampling strobe signals (where the integer k is greater than one) enable comparisons to be performed on small segments of fat pixel values. The strobe signal is generated using a phase locked loop that is synchronized with a horizontal synchronization signal provided by the graphics card. The PLL also regenerates the pixel clock using the horizontal synchronization signal.
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