Multi-standard video decoder
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United States of America Patent
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Dec 21, 2004
Grant Date -
N/A
app pub date -
Sep 2, 1999
filing date -
Sep 2, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A video decoder for decoding a composite video signal. The decoder includes an analog-to-digital converter (ADC), an input resampler, and a Y/C separator, all coupled in series. The ADC receives and digitizes the composite video signal to generate ADC samples. The input resampler receives and resamples the ADC samples with a first resampling signal to generate resampled video samples. The Y/C separator receives and separates the resampled video samples into luminance and chrominance components. The Y/C separator includes a delay element configured to receive the resampled video samples and provide a variable amount of delay. The variable amount of delay can be adjustable from line to line, and is typically based on an approximated duration of a video line. For an NTSC signal, the variable delay is select to be (m.multidot.n+m/2) samples, where m is a ratio of frequencies of the resampling signal and a color subcarrier of the composite video signal, and n is an integer selected such that (m.multidot.n+m/2) samples most approximate the duration of a video line. For a PAL signal, the variable delay is selected to be (m.multidot.n+3m/4) samples.
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