Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-02-03
1989-06-06
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 16, H04N 1112, H04N 1114
Patent
active
048376116
ABSTRACT:
A method and apparatus for encoding and detecting a wide band quadrature modulated color television signal which is NTSC format compatible is disclosed. The encoding steps include: generating an amplitude modulated radio frequency carrier; generating a first sideband of the carrier comprising limited bandwidth luminance information and a quadrature modulated chroma subcarrier; adaptively preemphasizing low level signal transitions occurring in extended bandwidth luminance information, and generating a second sideband of the carrier comprising the adaptively preemphasized extended bandwidth luminance information without addition or presence of the chroma subcarrier. The detection steps are: separating the second sideband of the carrier from the first sideband of the carrier and detecting the second sideband in order to recover the extended bandwidth luminance information; demodulating the quadrature modulated chroma subcarrier within the separated first sideband in order to recover chrominance information, deemphasizing the low level signal transitions in the detected extended bandwidth luminance information to put out restored extended bandwidth luminance information; and putting out the chrominance information and the restored extended bandwidth luminance information for further processing and display with a television picture display device.
REFERENCES:
patent: 4262304 (1981-04-01), Faroudja
patent: 4521803 (1985-06-01), Gittinger
patent: 4641179 (1987-02-01), LoCicero et al.
Herold, A Compatible High-Resolution TV System for Cable Casting, Proceedings of the IEEE, Jul. 1970, pp. 1013-1015.
Compatible High Definition Television Broadcast Systems, T. S. Rzeszewski, M. Pazarci, and J. L. LoCicero.
Harrison David B.
Shepperd John W.
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