SAMPLING RATE CONVERSION SYSTEM USING DIGITAL DIFFERENTIAL ANALYZER

摘要

PROBLEM TO BE SOLVED: To attain resampling in a single FIR filter without individually requiring an interpolator and a selective extractor by providing the single FIR filter with a combined function for interpolation, filtering and selective extraction. SOLUTION: A luminance filter 19 and a color filter 20 are charged with parts corresponding to selective extraction operation peculiar to interpolation, FIR filtering and resampling. Namely the filter 19 is driven by a Y signal and the filter 20 is driven by both of Cb and Cr signals. Each of the Cb, Cr signals has a half of the execution sampling rate of the Y signal. The filter 20 executing clock operation at the same speed as the filter 20 alternately processes Cb and Cr sampling streams by a time division method. Respective FIR coefficients to be used by the filters 19, 20 are stored in an FIR coefficient storage device 18.