Transmission system of television signal

TLDR: In this article, the authors proposed a scheme to prevent degradation in picture quality by placing a scanning line of an odd-numbered order into an odd numbered order even after the replacement of the scanning line.

Abstract: PURPOSE:To prevent degradation in picture quality by placing a scanning line of an odd-numbered order into an odd-numbered order even after the replacement and placing a scanning line of an even-numbered order into an even-numbered order even after replacement in replacing the scanning line. CONSTITUTION:An analog video signal to be scrambled is inputted to a terminal 1 in a scrambler at the broadcast station side, and after this signal passes through an LPF2, it is fed to an A/D converting circuit 3 and a master clock oscillator 4. Then the oscillator 4 produces a master clock having subcarrier frequencies fSC-3fSC based on a color burst signal of the video signal, and the clock is fed to an A/D converter 3, a synchronizing separator circuit 5 and a timing clock generating circuit 6. This converter 3 samples the input video signal by using the master clock and converts it into a digital video signal. This signal is fed to a frame memory 7, written in a ROM8, read from a ROM9 based on the scanning designation signal from a computer 10 and the scanning lines are replaced.