Technique for generating semi-compatible high definition televis

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

1984-04-16

1985-08-13

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 11, 358 12, H04N 938, H04N 939, H04N 942, H04N 932

Patent

active

045353522

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 frDconverting the SC-HDTV signal back into either a HDTV or conventional TV signal.

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