A digital comb filter for decoding composite video signals into a luminance and a chrominance component. A Fast Fourier Transform (FFT) circuit or a band split filter circuit is used to determine important characteristics of an input video signal without demodulating the video signal. The circuits produce...http://www.google.com.tw/patents/US6462790?utm_source=gb-gplus-share專利 US6462790 - Digital comb filter for decoding composite video signals
