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Method and apparatus for video standard conversion

  • US 4,504,852 A
  • Filed: 09/10/1982
  • Issued: 03/12/1985
  • Est. Priority Date: 09/10/1982
  • Status: Expired due to Fees
First Claim
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1. A method for converting an input video signal having a first scan line rate to an output video signal having a second scan line rate, said method comprising the steps of:

  • generating a plurality of carrier frequencies, each carrier-frequency being associated with at least one scan line segment of said input video signal;

    modulating each of said carrier frequencies with video information corresponding to said least one scan line segment of said input video signal;

    holding substantially constant the modulation of each said carrier frequency between successive scan lines of said input video signal;

    sampling at least some of said carrier frequencies in a sequence so as to derive a video output signal modulated with a sequence of carrier frequency modulation samples, said video output signal derived for each sampling sequence representing one decoded scan line;

    repeating said sampling sequence at a rate related to the desired scan line rate of the output video signal.

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