Techwell, Inc.

Jao-Ching Lin

Feng Yang

Feng Kuo

Chien-Chung Huang

Chi-Hao Yang

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&middot;n&plus;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&middot;n&plus;m/2) samples most approximate the duration of a video line. For a PAL signal, the variable delay is selected to be (m&middot;n&plus;3m/4) samples.

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Jao-Ching Lin