Digital color demodulator

Details Digital color demodulator Digital color demodulator

1987-08-26

1989-01-17

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, 358 19, H04N 964

Patent

active

047991020

ABSTRACT:
This invention provides a digital color demodulator having: a first phase locked loop circuit which generates an analog subcarrier signal phase locked to the color burst signal; a second phase locked loop circuit which generates an internal system clock signal phase locked to a horizontal period; a Y/C color separation circuit operating under the internal system clock signal; a pair of multiplying circuits, one of which multiplies a digital subcarrier signal, converted from the analog subcarrier signal, with the color signal, and the other of which multiplies the digital subcarrier signal, phase delayed by substantially 90.degree., with the color signal, thereby performing orthogonal demodulation of the signal.
The digital processing circuits of this invention are all driven by the internal system clock signal generated by the second phase locked loop circuit.

REFERENCES:
patent: 4349833 (1982-09-01), Clarke
patent: 4395729 (1983-07-01), Lewis
patent: 4625232 (1986-11-01), Nillesen
patent: 4686560 (1987-08-01), Balaban et al.
patent: 4689664 (1987-08-01), Moring et al.
patent: 4694326 (1987-09-01), Demmer
patent: 4709257 (1987-11-01), Suzuki

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