METHOD FOR TRANSMITTING AND RECEIVING SIGNAL OF HIGH-RESOLUTION COLOR TELEVISION Russian patent published in 1994 - IPC

FIELD: high-resolution color television. SUBSTANCE: optical signal is converted to video signal of brightness and color during transmission. Resulted signals are sampled. Brightness and color signals are separated into signals of odd and even lines. Signals corresponding to difference between adjacent lines are calculated. Sampled signal is converted by compression of brightness and color-difference signals. Signals of brightness, color and line-difference are added. Signals of brightness and color are expanded. Number of lines in frame is doubled. In addition following procedures are performed during transmission. Signal is filtered, sampled signal is converted from 1250/50/1:1 code to 1250/25/2:2 code, duration of lines is doubled, sampled signal is converted from 625/25/1:1 code to 625/12,5/2:1 code, signal is clipped, converted to analog, resulted signals are switched, modulated in square-law. Signals are added and transmitted in code having separated color and brightness signals with standard encoding 625/12,5/2:1, bandwidth is 16 MHz. Following procedures are performed during receiving signal, signal is separated, inter-laced signals are converted to non-interlaced, spectrum is recovered by generation of color signal with encoding 625/25/1:1, its bandwidth is 7,5 MHz, spectrum is recovered, expanded in time and source encoding 1250/50/1: 1 of brightness and color signals is restored. Transmitting part of device has source of TV picture, encoder of video signal, transmitter. Receiving part of device has receiver, decoder, SECAM decoder, receiver of high-resolution TV, SECAM receiver. EFFECT: improved quality of transmission and receiving of color TV picture. 5 dwg