Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-04-07
1990-01-30
Shepperd, John
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358180, H04N 704
Patent
active
048977225
ABSTRACT:
A widescreen enhanced definition television system compatible with an existing television standard (e.g., NTSC) has provisions for utilizing a conventional television camera. The conventional camera is modified by replacing the conventional lens with an anamorphic lens or by modifying the scanning control signals to produce a widescreen television signal corresponding images with a widescreen aspect ratio (e.g., 5:3) greater than the conventional aspect ratio (e.g., 4:3). The widescreen television signal produced by the modified camera is coupled to an encoder without restriction of horizontal bandwidth required to conform to the existing television standard. The encoder produces a television signal encoded with components for producing widescreen images with enhanced horizontal resolution when processed by a widescreen receiver but suitable for transmission within a single transmission channel of the existing television standard. When processed by a conventional receiver, due to the nature of the encoding, an image with the conventional aspect ratio but, without significant artifacts is produced.
REFERENCES:
patent: 3097262 (1963-07-01), Ehrenhaft
patent: 4385324 (1983-05-01), Shioda et al.
patent: 4394690 (1983-07-01), Kobayashi
patent: 4816899 (1989-03-01), Strolle et al.
"Encoding for Compatibility and Recoverability in the ACTV System" by M. A. Isnardi, IEEE Transactions on Broadcasting, vol. BC-33, No. 4, Dec. 1987.
"Decoding Issues in the ACTV System", by M. A. Isnardi et al., IEEE Transactions on Consumer Electronics, vol. 34, No. 1, Feb. 1988.
Emanuel Peter M.
General Electric Company
Shepperd John
Tripoli Joseph S.
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