JPS56102180A - Picture signal encoding system - Google Patents

Abstract

PURPOSE:To make it possible to obtain pictures with high quality and less distortion by attaching a movement detecting circuit which detects the movement of picture signals when they are encoded. CONSTITUTION:Color subcarrier SC of an input picture signal is entered into clock generator 33 and, after A/D converting the picture signal with a clock signal whose frequency is 4 times larger than that of SC in A/D converter 34 to perform preparatory encoding, the converted picture signal is entered into prefilter 36. The output of filter 36 is sampled with the 1/2 frequency of the clock signal and the phase of the sampling signal is reversed in every period corresponding to integer times of horizontal scanning period h to transmit the sampling signal. In the receiving side, the input signal is preencoded by interpolating filter 39 to decode the picture signal. Filter 39 compares the sampling picture signal with the picture signal delayed by the integer times of the field period. When picture movement is detected by picture movement detecting circuit 43, switch 49 is connected to the b side, the high component is interpolated with the high component of the picture signal generated before the integer time of period h and the low component is interpolated with the low component of the neighboring picture signal in the same horizontal period.