DC restoration utilizing the color burst signal

Details DC restoration utilizing the color burst signal DC restoration utilizing the color burst signal

1977-01-28

1978-10-24

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

041224922

ABSTRACT:
A method and apparatus is disclosed for restoring the d.c. level of a composite video signal which has a burst of chrominance subcarrier cycles occuring in the horizontal blanking period. The d.c. level of the signal is measured using integrating techniques for a period that corresponds to a whole number of cycles of the chrominance subcarrier and the measured level is used to generate an error signal for adjusting the level to the proper volume. By using a precise whole number of cycles during integration, the d.c. level can be accurately measured.

REFERENCES:
patent: 2843666 (1958-07-01), Preisig
patent: 3207998 (1965-09-01), Corney et al.
Dennison, "Color TV Signal DC Reinsertion Clamp Circuit," RCA Technical Note, No. 60, Received 12-2-57.

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