Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-11-17
1988-12-27
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 12, 358141, H04N 1118, H04N 712
Patent
active
047944471
ABSTRACT:
A high definition television signal having 525 lines per frame, a sequential scan, and 59.94 frames per second is encoded into a time multiplex signal for transmission. The encoder drops alternate line, but creates line difference signals which allow reconstruction of the dropped lines at the receiver. The line difference signals are time compressed, while the luminance signals of the alternate, transmitted lines are time expanded. The encoder can accept programs from any one of a plurality of program originators, as long as the frame and line rates are multiples of one another. The time multiplex signal carries luminance and chrominance components in each line, but update signals such as high frequency luminance, high frequency chrominance and the line difference signals in a predetermined pattern in sequential frames. At the receiver, the time multiplex signal is decoded into the original high definition signal and is further encoded directly into two channels, the first being compatible with NTSC, the second being an augmentation channel. The two channels can latter be recombined, for example at a cable receiver, to create the high definition signal, while the first channel signal can be directly received on an NTSC receiver.
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Briody Thomas A.
North American Philips Corporation
Rich Marianne R.
Shepperd John W.
Tamoshunas Algy
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