Clock generator for a digital color television signal receiver

Details Clock generator for a digital color television signal receiver Clock generator for a digital color television signal receiver

1981-08-31

1983-08-30

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

044020058

ABSTRACT:
An arrangement is provided for developing timed clock signals for a digital baseband television signal processing system. An AFPC loop circuit is responsive to the color burst signal component of a received analog video signal for producing a continuous wave signal which is aligned in frequency and phase with the color burst signal. The continuous wave signal is applied to a tint control circuit, which is responsive to a control signal, for variably shifting the phase of the continuous wave signal. The phase-shifted continuous wave signal is then applied to a phase-locked loop circuit, which produces a sampling signal for an analog-to-digital converter at a frequency which is a multiple of the color subcarrier frequency and with a phase which will result in a reproduced image of a desired tint or hue. In one embodiment of the present invention, the continuous wave signal is phase-shifted by a series of logic gates having a plurality of output taps. A multiplexer selects a signal of a desired phase shift from one of the output taps, which signal is then applied to the phase-locked loop circuit for generation of the sampling signal.

REFERENCES:
patent: 3946432 (1976-03-01), Goldberg et al.
patent: 4020500 (1977-04-01), Harwood
patent: 4051519 (1977-09-01), Harwood
patent: 4122487 (1978-10-01), Beaulier
patent: 4270139 (1981-05-01), Flamm et al.
patent: 4270177 (1981-05-01), Endoh et al.
Color Television Fundamentals-Milton S. Kiver, Second Edition, McGraw-Hill Book Co., 1964, p. 298.
Article "Digital VLSI Breeds Next-Generation TV Receivers" by T. Fischer, Pub. Aug. 11, 1981 Electronics, pp. 97-103.
Devereux et al., Proc. IEE, vol. 125, No. 6, pp. 591-598, Jun. 1978.

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