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Video processing circuit with line memory control

  • US 5,289,284 A
  • Filed: 11/12/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 06/01/1990
  • Status: Expired due to Term
First Claim
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1. A video signal processing circuit, comprising:

  • a line memory for said video signal;

    means for writing and reading of video data samples into and out of said line memory, different numbers of data samples per line being stored during expansion and compression of said video signal;

    means for comparing a first value, specifying a first pixel location in the horizontal line period where reading or writing of said line memory is to begin, with a second value specifying a second pixel location within each line period;

    means for storing a third value corresponding to the number of data samples stored in said line memory; and

    ,means for counting the number of data samples which have actually been written into said line memory or read from said line memory, said counting means having an output of said comparing means as a first input and said third value as a second input.

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