Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-03-17
1988-01-19
Psitos, Aristotelis M.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358138, 358 12, 358330, H04N 9491
Patent
active
047207515
ABSTRACT:
The present invention provides a transmission method denoted as the "color shift" method. Therein the composite color video signal, which is formed by a sequence of analog line signals, is sampled, as a result of which each analog line signal is converted into a time-discrete line signal formed by a plurality of line signal samples occurring at a rate f.sub.s, each sample being formed from the sum of a luminance and a chrominance signal sample. Thereafter, these time-discrete line signals are submitted to a scrambling operation in which, in accordance with a predetermined pattern, a number of line signal samples is, each time, selected from the line signal samples of a group of time-discrete line signals for assembling time-discrete auxiliary line signals. This selection is effected such that of all those line signal samples which together represent a given time-discrete auxiliary line signal, the associated chrominance signal samples all have the same polarities. As a result thereof the chrominance signal is converted without bandwidth limitation to a lower frequency band, while it continues to be located within the frequency band occupied by the luminance signal. This new composite color video signal can now, after having been converted into an analog signal, be transposed in its totality to a suitable transmission band by means of frequency modulation.
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Briody Thomas A.
Oisher Jack
Psitos Aristotelis M.
Streeter William J.
U.S. Philips Corporation
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