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Method and apparatus for standardizing nonstandard video signals

  • US 4,500,908 A
  • Filed: 06/18/1982
  • Issued: 02/19/1985
  • Est. Priority Date: 06/18/1982
  • Status: Expired due to Fees
First Claim
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1. A method of correcting color video signals represented in digital form having a horizontal scan frequency which is an even harmonic of the color subcarrier to an N.T.S.C. interlaced color video signal having N.T.S.C. luminance and chrominance components and being compatible with and superimposable on other N.T.S.C. color video signals comprising the steps of:

  • (a) writing the digitized signals into at least one line memory at selected memory locations;

    (b) means for resetting the source of the video signals to be corrected once during each N.T.S.C. vertical field to synchronize said source to the N.T.S.C. vertical frame rate;

    (c) reading out the digitized video signals from selected memory locations in said line memories at a clock rate synchronized with an N.T.S.C. source;

    (d) extracting luminance and chrominance information from the read out signals including the step of shifting the signal sampling window every other horizontal line for either the chrominance or luminance information;

    (e) combining the information extracted in step (d) to obtain corrected, analog color video signals.

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