Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-03-23
1990-07-24
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 12, 358 22, 358147, H04N 704, H04N 1106
Patent
active
049438565
ABSTRACT:
A method and apparatus for introducing a pan and scan feature to a multiple-signal high definition television (HDTV) system, so that a compatible signal received by a standard TV receiver may be a panned version of a wide aspect ratio HDTV signal, and so that high quality recombination of the compatible and augmenting signals by an HDTV receiver is possible. A pan and scan data word representing the relative movement of the compatible portion of the HDTV signal is inserted during the vertical blanking period of each frame of the HDTV signal, for causing panning synchronization between an HDTV transmitter and an HDTV receiver. The pan and scan data word corresponds to the beginning read address of a fixed coefficient memory containing video attenuation coefficients, which determine the degree of signal attenuation, to be applied at each pixel location along an HDTV scan line. The coefficient memory is addressed in a wrap-around manner, so that if the starting address in the read cycle is other than zero, the reading continues until the highest address in the memory is reached, and then address zero et seq. are read on up to the address before the starting address. By changing the points of passage, attenuation and suppression along scan lines, panning occurs.
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IEEE Transactions on Consumer Electronics, "Decomposition and Recombination of a Wide Aspect Ratio Image for ENTSC Two-Channel Television" by Alan P. Cavallerano, Aug. 1987.
"Edge Stitching of a Wide-Aspect Ratio HDTV Image" by LoCicero et al; IEEE; 1986, pp. 436-440.
Bakhmutsky Michael
Basile Carlo
Cavallerano Alan P.
Tsinberg Mikhail
Marion Michael E.
North American Philips Corporation
Parker Michael D.
Shepperd John W.
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