Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-09-02
1989-09-12
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, 358141, 358 12, 358138, H04N 712
Patent
active
048665193
ABSTRACT:
A method of enabling an increase in the vertical definition of a transmitted television signal while preserving its bandwidth including the steps of decimating alternate lines of the television signal and reinterpolating untransmitted alternate lines upon reception. The decimation is accomplished by diagonally filtering the television signal in two dimensions to form a figure of five sample structure. Every other line is then added to the line adjacent to it so that half the lines are available for transmission, each line comprising folded-in high frequency information about missing line samples. Prior to transmission, bnadwidth is converted by filtering the signal to be transmitted at a skew-symmetric low pass filter. Apparatus for encoding and decoding the television signal each includes a two dimensional diagonal filter and line switching and control circuitry. The storage of a full field of a sample data is not required for processing in accordance with the present method. Consequently the present apparatus comprises only line store means associated with the line switching and control circuitry of encoding apparatus.
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M. J. J. C. Annegarn, J. P. Arragon, G. de Haan, J. H. C. van Heuven and R. N. Jackson "HD-MAC: A step Forward in the Evolution of Television Technology", Aug. 8, 1987, pp. 197-212.
Heinz Sauerburger "Breit-und Schmalbandige Komatible Einkanalige HDTV -Ubertragugn" Jan.-Feb. 1987, pp. 23-32 (English Translation Enclosed).
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"Direct Television Broadcasts by Satellite Desirability of a New Transmission Standard", K. Lucas and M. D. Windram, IBA Report 116/81, 09/81.
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Lucas Keith
van Rassel William F.
Groody James J.
Kostak Victor R.
Scientific - Atlanta, Inc.
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