摘要 |
<p>PURPOSE:To reproduce a picture having excellent picture quality even when a band compression ratio is increased by adapting and controlling a vertical space frequency component of each band limit picture signal in high frequency of a horizontal space frequency area in accordance with actions of a picture in terms of animation and then by transmitting it. CONSTITUTION:Bands in the vertical direction of chrominance signals C1 and C2 are limited by vertical low-pass filters LPFs 1a and 1b, scanning lines are alternately thinned by a changeover switch SW1, and with combination of thinned lines they are made into a line sequential signal, which is supplied to a time division circuit 2 together with a luminance signal Y. The circuit 2 transmits the signal whose band in the vertical direction is not limited to a terminal i1 of a mixer 13 through frame memories 3a, 3b and 3c, adders 7a, 7b and 7c and an 1/3 divider 8. A vertical band limit signal is sent to a terminal i2 and an output of the mixer 13 is given to a switch SW4, which switches picture signals in intermediate and narrow bands to the specific order. A time base is compressed by a time base converter, and a band-compressed time base compression multiplex signal is outputted and then transmitted.</p> |