Image size reduction circuit for reducing ordinary-sized image into smaller area

摘要

An image squeezing circuit produces an output image carrying signal (S2) for reproducing an small-sized image 1/m times larger than an ordinary-sized image (where m is an integer not less than two), and an input image carrying signal (S1) is separated for producing an analog chrominance subcarrier signal (D1), an analog luminance signal (Y1) and a color subcarrier signal (F1), wherein the analog luminance signal is sampled with a sampling signal (F5) n/m times larger in frequency than the color subcarrier signal (where n is an integer not less than three) for producing a decimated digital luminance signal(Y3) but the analog chromi­nance subcarrier signal is sampled with another sampling signal (F4) n times larger in frequency than the color subcarrier signal in every m pulse intervals of the color subcarrier signal for producing a decimated digital chrominance signal (D3), the deci­mated digital luminance signal and the decimated digital chromi­nance signal being supplied to respective digital-to-analog converting circuits (215 and 315) in response to a high frequency pulse signal (F2) n times larger in frequency than the color subcarrier signal for producing the output image carrying signal.