Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-09-19
1990-07-24
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 16, H04N 1114
Patent
active
049438476
ABSTRACT:
Extended horizontal definition is provided in a television system in which the wideband and narrowband chrominance components of a video signal are modulated for transmission by a subcarrier. The modulated wideband I chrominance component is filtered over a bandwidth that is antisymmetrical about the subcarrier frequency with an extended upper sideband to thereby entend the bandwidth that is available for transmission of the I chrominance component. The modulated I chrominance component is antisymmetrically filtered to enhance the relative amplitude in the extended portion of the upper sideband for transmission, and in a television receiver the modulated I chrominance component of a received video signal is filtered to have a relatively flat-response over the antisymmetrical bandwidth about the subcarrier frequency. Alternatively, the antisymmetrical filtering of the modulated I chrominance component to enhance the relative amplitude in the extended portion of the upper sideband may take place in the receiver. The I chrominance component is filtered prior to modulation over a bandwidth defined by 2.4 MHz above the subcarrier frequency and 1.5 MHz below the subcarrier frequency. The narrowband Q chrominance component is filtered prior to modulation over a bandwidth defined by 1.5 MHz above and below the subcarrier frequency.
REFERENCES:
patent: 2793348 (1957-05-01), Hunter
patent: 2795643 (1957-06-01), Lockhart
patent: 2898397 (1959-08-01), Richman
patent: 4318120 (1982-03-01), Acampora
patent: 4521803 (1985-06-01), Gittinger
patent: 4543598 (1985-09-01), Oliphant
patent: 4589011 (1986-05-01), Rzeszewski
Charles J. Hirsch, Color Television, IEEE Spectrum, Feb. 1968, pp. 62-74, "Quadrature Crosstalk p65".
Cable/Home Communication Corp.
Callan Edward W.
M/A-COM Government Systems Inc.
Shepperd John W.
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