Technique for generating semi-compatible high definition...

Details Technique for generating semi-compatible high definition... Technique for generating semi-compatible high definition...

H - Electricity

04

N

350/36

H04N 7/01 (2006.01) H04N 7/10 (2006.01) H04N 11/24 (2006.01)

Patent

CA 1238711

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

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