Two-channel compatible HDTV system

Details Two-channel compatible HDTV system Two-channel compatible HDTV system

1988-06-01

1990-03-06

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358141, H04N 1100, H04N 1102, H04N 700

Patent

active

049070690

ABSTRACT:
A video signal is produced as a 37.8 MHz bandwidth high resolution signal. The system then derives a compatible NTSC signal from that signal and transmits the NTSC signal on one channel and an enhancement signal is transmitted on a second channel. The enhancement signal is produced by storing the 37.8 MHz signal, scanning it at a lower frame rate, and folding it so that the original information is retained within a normal channel width. In an HDTV receiver, the two channels are received and the signals are decoded separately then, using dot interlace techniques, combined to produce the HDTV signal having three times the horizontal and vertical resolution of a standard NTSC signal.

REFERENCES:
patent: 3617626 (1971-11-01), Bluth
patent: 4628344 (1986-12-01), Glenn
patent: 4694338 (1987-09-01), Tsinberg
patent: 4723157 (1988-02-01), Wendland et al.
"High-Definition Television Update", by Ronald K. Jurgen, Senior Editor, IEEE Spectrum, Apr. 1988, pp. 56-62.

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