Automatic color control for a digital television receiver

Details Automatic color control for a digital television receiver Automatic color control for a digital television receiver

1982-10-29

1984-11-13

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 35, 358 40, H04N 9535

Patent

active

044829167

ABSTRACT:
An automatic color control (ACC) for a digital television receiver is compatible with and is unaffected by variation of the phase of the color subcarrier signal introduced in demodulating the color subcarrier to effect control of tint. ACC is effectuated by digital gain control for scaling the digital words representing the sampled magnitudes of the color subcarrier burst signal. Quadrature demodulation of the color subcarrier produces color signal digital words I and Q which are each sampled and latched during the color subcarrier burst. The sampled digital words are each squared and are then summed together. The summed digital word is compared to a chroma reference digital word and the difference digital word is employed to scale the color subcarrier digital words.

REFERENCES:
patent: 3732358 (1973-05-01), Harwood
patent: 3962723 (1976-06-01), Srivastava
T. Fischer, "Fernsehen Wire Digital", Elektronik, 1981, pp. 27-35.

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