Patent ID: 8233529

Claim:
A video decoder, comprising: an analog-to-digital converter, operating with a sampling rate 2*R, for digitizing an analog video signal to obtain a plurality of samples; a main processing path collecting a plurality of odd samples to provide a first decoded video output and synchronization information, wherein the first decoded video output comprises a first luminance signal and a chrominance signal; a sample rate converter converting a plurality of even samples at a half sampling rate R into a plurality of first converted samples at a first predetermined frequency; a filter filtering the plurality of converter samples to obtain a second luminance signal, having a luminance component but no chrominance component; a buffer for storing the second luminance signal, wherein the second luminance signal is read from the buffer as a buffered output in response to the synchronization information, and the second luminance signal is synchronized with the first luminance signal; an output sample rate converter converting the buffered output into a plurality of second converted samples at a second predetermined frequency, wherein the second predetermined frequency is substantially the same as a frequency of the first luminance signal; and a parallel-to-serial converter receiving the first decoded video output and the plurality of second converted samples to drive a second decoded video output, wherein an output rate of the second decoded video output is equal to an output rate of the first decoded video output combined with the plurality of second converted samples; wherein the main processing path further comprises: a 3-dimensional filter for separating luminance information and chrominance information; and a motion detector for determining whether a frame is a still frame or a motion frame, wherein the video decoder further comprises a multiplexer that selectively outputs the first decoded video output or the second decoded video output as decoded video data, when the motion detector determines a current frame is a still image, the multiplexer selects the second decoded video output as the decoded video data.