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Time base converter which automatically adapts to varying video input rates

  • US 5,404,170 A
  • Filed: 04/15/1993
  • Issued: 04/04/1995
  • Est. Priority Date: 06/25/1992
  • Status: Expired due to Term
First Claim
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1. A time base changer for a video converter for converting between a sequence of input video images at an input video rate and a sequence of output video images at an output video rate, said time base changer comprising:

  • N video stores, where N is an integer greater than one, each for storing a video image;

    means for enabling said video stores cyclically in turn and at said input video rate for storing successive input video images in successive said video stores;

    multiplexer means connected to said video stores for outputting said video images stored therein;

    control means successively providing multiplexer control signals at said output video rate to said multiplexer means for selecting adjacent pairs of the video stores such that a sequence of pairs of the video images are output from said video stores via said multiplexer means at said output video rate;

    wherein said input video rate is a selectable one of a plurality of rates and wherein said enabling means comprises a counter clocked at said selected input video rate.

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