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Parabolic-wave shaping circuit for focus-correction

  • US 5,760,549 A
  • Filed: 04/21/1997
  • Issued: 06/02/1998
  • Est. Priority Date: 03/07/1995
  • Status: Expired due to Term
First Claim
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1. A focus correcting circuit for a cathode-ray tube (CRT) display having vertical and horizontal scanning periods, comprising:

  • a first amplifier for outputting a first parabolic wave with a vertical scanning period;

    a second amplifier for outputting a second parabolic wave with a horizontal scanning period;

    a parabolic-wave outputting circuit for outputting a combined signal of said first and second parabolic waves as output waves; and

    a parabolic wave shaping circuit for shaping said output wave including said first and second parabolic waves having vertical and horizontal scanning periods, said parabolic wave shaping circuit further comprising;

    a holding circuit for receiving a blanking pulse used to clip a portion of said output wave corresponding to a flyback period in said CRT.

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