Apparatus and method for maintaining synchronization of multiple delayed signals

  • US 6,392,707 B1
  • Filed: 07/28/2000
  • Issued: 05/21/2002
  • Est. Priority Date: 07/26/1993
  • Status: Expired due to Fees
First Claim
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1. An electronic apparatus for imparting a substantially fixed delay to an input video signal and at least one secondary signal, said input video signal and said secondary signal having a timing relationship, said apparatus including in combination:

  • a) an input processing circuit responsive to said input video signal and operative to couple at least pixels corresponding to the active video portion of said input video signal to the input of a video memory;

    b) said video memory operative to temporarily store said pixels;

    c) a timing circuit responsive to a reference signal to provide a timing signal, said reference signal being synchronous with said input video signal with respect to the frequencies thereof;

    d) an output circuit responsive to said timing signal and said stored pixels of b) to output a delayed video signal which is a version of said input video signal having said substantially fixed delay;

    e) a secondary signal input processing circuit responsive to said secondary signal and operative to couple said secondary signal to the input of a secondary memory;

    f) said secondary memory operative to temporarily store at least part of said secondary signal;

    g) a secondary output circuit responsive to said stored secondary signal of f) to output a delayed secondary signal which is a version of said secondary signal having said substantially fixed delay.

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