Method and apparatus for horizontally scaling computer video data for display on a television
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United States of America Patent
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Aug 27, 2002
Grant Date -
N/A
app pub date -
Jan 28, 1999
filing date -
Jan 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for converting pixel data from a computer video format to a television-compatible composite video waveform. A color space converter converts RGB or YCrCb pixel data into YUV pixel data. The YUV pixel data is supplied to an encoder which encodes the data into a composite video waveform. A clock generator generates an encoder clock frequency based on the horizontal resolution of the incoming computer pixel data. The encoder clock frequency is sufficient to allow encoding of all incoming pixels in the active video portion of the waveform without physically scaling or altering the pixel data. Sync and burst processors in the encoder encode sync pulses and burst waveforms at proper timing intervals despite the variable encoder clock frequency by accessing sync pulse and burst waveform values and timing parameters appropriate to ranges of clock frequencies that are stored in a ROM.
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