Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-03-01
1991-07-23
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358138, H04N 704
Patent
active
050348140
ABSTRACT:
A system for converting a high definition video signal corresponding to a high definition picture, into a subsampled video signal compatible with NTSC transmission includes a circuit for performing N-phase subsampling on the high definition video signal to produce N sets of subsamples. Each of the subsamples corresponds to a different geographic position in the high definition picture. The N sets of subsamples are processed during N NTSC video frames, respectively, and the N NTSC video frames form an NTSC picture corresponding to the high definition picture. Each of the N sets of subsamples are processed to map each subsample into a geographic position within the NTSC picture, which corresponds to the geographic position in the high definition picture. By outputting the NTSC samples in a manner which preserves, in the NTSC signal, the relative frame-to-frame geometric offsets used in the sampling process, NTSC flicker on conventional NTSC receivers is minimized. Circuitry for reconstructing the high definition video signal from the subsampled signals allows an advanced or high definition receiver to receive the high definition video signal. Circuitry is also provided to increase the interlacing on standard NTSC receivers.
REFERENCES:
patent: 2892015 (1959-06-01), Jones
patent: 3617626 (1971-11-01), Bluth
patent: 4521803 (1985-06-01), Gittinger
IEEE Transactions on Broadcasting, vol. 34, No. 3, Sep. 1988, "High Definition and High Frame Rate Compatible N.T.S.C. Broadcast Television System", by G. William Meeker, pp. 313-322.
IEEE Transactions on Broadcasting, vol. BC-33, No. 4, Dec. 1987, "High Definition NTSC Broadcast Protocol", by Richard J. Iredale, pp. 161-169.
IEEE Transactions on Broadcasting, vol. BC-33, No. 4, Dec. 1987, "An HDTV Broadcasting System Utilizing a Bandwidth Compression Technique-MUSE", by Yuichi Ninomiya et al., pp. 130-160.
Dill, F. H., "High Resolution NTSC Television System", IBM Technical Disclosure, vol. 21, No. 5, 10/78.
Groody James J.
Harvey David E.
Lynch M. P.
Westinghouse Electric Corp.
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