Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-09-22
1983-06-21
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 31, 358 37, H04N 950
Patent
active
043896650
ABSTRACT:
A composite video signal is separated into luminance signal component and carrier chrominance signal component by means of a signal separation circuit using a comb filter. The carrier chrominance signal component is multiplexed in frequency-interleaved relation with the luminance signal component, and formed by quadrature modulation of a color subcarrier with a wideband I signal and a narrowband Q signal. A line correlation detector for detecting the correlation between video signals on adjacent horizontal scanning lines is connected with both outputs of the signal separation circuit. The detector detects the absence of line correlation when color subcarrier frequency appears simultaneously at both outputs of the signal separation circuit. The I signal is demodulated in wideband when the line correlation exists and in narrowband when no line correlation exists.
REFERENCES:
patent: 3405230 (1968-10-01), Parker
patent: 3405231 (1968-10-01), Hilbert et al.
patent: 4074321 (1978-02-01), Miller
patent: 4307414 (1981-12-01), Lee
patent: 4313131 (1982-01-01), Lee
Nagao Nobuya
Sakai Teturou
Richardson Robert L.
Tokyo Shibaura Denki Kabushiki Kaisha
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