Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-09-30
1984-08-14
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
044660154
ABSTRACT:
An automatic color burst magnitude 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 signal produces color signal digital words I and Q which are each sampled and latched during the color subcarrier burst. The averages of the sampled I and Q digital words are applied as respective portions of the address of a read only memory (ROM). The ROM provides error words indicating whether the chroma burst amplitude is too large or too small. A control device responds to the error word to scale the color subcarrier digital words, and therefore scale the chroma burst amplitude to a predetermined magnitude.
REFERENCES:
patent: 4250458 (1981-02-01), Richmond et al.
patent: 4270177 (1981-05-01), Endoh et al.
patent: 4281408 (1981-07-01), Bonnerot
patent: 4419688 (1983-12-01), Miskin et al.
ITT Intermetall, "A New Dimension-VLSI Digital TV System", Sep. 1981.
Perlman Stuart S.
Wargo Robert A.
Berard, Jr. C. A.
Murray Richard
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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