TECHNIQUE FOR GENERATING SEMI-COMPATIBLE HIGH DEFINITION TELEVISION SIGNALS FOR TRANSMISSION OVER TWO CABLE TV CHANNELS

摘要

A TECHNIQUE FOR GENERATING SEMI-COMPATIBLE HIGH DEFINITION TELEVISION SIGNALS FOR TRANSMISSION OVER TWO CABLE TV CHANNELS The present invention relates to a technique for generating a Semi-Compatible High Definition Television (SC-HDTV) signal which can be sent over two present-day Cable Television (CATV) channels. In accordance with the present invention, a HDTV signal is formed comprising a line scan rate which is a multiple of the line scan rate of a current conventional TV signal. The SC-HDTV signal is formed therefrom by transmitting a first HDTV line as is and a second HDTV line as a field differential signal transmitted via QAM on the IF or RF carrier of the first line signal at a line scan rate of a current conventional TV signal. Arrangements are also disclosed for converting the SC-HDTV signal back into either a HDTV or conventional TV signal.