Composite video color signal generation from digital color signa

Details Composite video color signal generation from digital color signa Composite video color signal generation from digital color signa

1981-08-12

1984-04-10

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340749, 358 10, 358 81, G09G 128

Patent

active

044424280

ABSTRACT:
A 3.58 MHz subcarrier signal and a 14.318 MHz clock signal are applied to three flipflops (50, 52 and 54) in such a manner that there appears on the output terminals (Q and Q) of the latches individual phase-shifted subcarriers having relative phases of 0.degree., 180.degree., 90.degree., 270.degree., 135.degree. and 315.degree. , respectively, representing the colors yellow, blue, red, cyan, magenta and green, respectively. Computer-generated digital color signals (+BLUE, +GREEN, +RED) are applied to the switching inputs (A, B, C) of a multiplexer (56) in order selectively to switch to the output of the multiplexer individual ones of the phase-shifted subcarriers in accordance with the code represented by the digital color signals. The individual subcarriers are combined in a summing circuit (62, 64) with television synchronizing and blanking pulses to produce a composite video color signal which is directly compatible with a conventional composite monitor and, after R.F. modulation, with a conventional television receiver. Brighter versions of the colors are obtained by increasing the direct current level (+INTENSITY) at the summing circuit.

REFERENCES:
patent: 3510865 (1970-05-01), Callahan et al.
patent: 3944999 (1976-03-01), Moore
patent: 4093960 (1978-06-01), Estes
patent: 4139838 (1979-02-01), Inose et al.
patent: 4155095 (1979-05-01), Kirschner
patent: 4217604 (1980-08-01), Wozniak
patent: 4342029 (1982-07-01), Hofmanis et al.

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