Color television signal transmission system and improved- definition receiver for use in the system

摘要

A color television signal transmission system in which, at the transmitter end the frequency bandwidths of the brightness and chrominance signals are extended by two to three times as compared with the NTSC system to improve horizontal resolution and color reproducibility. At the receiver end, the received composite signal is subjected to both interframe separation and picture adaptive separation to provide two brightness signals and two chrominance signals. A combined brightness signal is formed by adding the two brightness signals after they have been multiplied by weights which are determined on the basis of picture movement, and a combined chrominance signal is formed in the same way. The combined brightness and chrominance signals are converted into red, green and blue color signals, and then the vertical resolution is improved by movement adaptive line interpolation. The transmission system has vertical resolution and horizontal resolution superior to the NTSC, IDTV, and EDTV systems, and furthermore can be realized by simpler and cheaper equipment than the HDTV system.