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Clock pulse generator capable of being switched to process both standard and non-standard television signals

  • US 5,025,310 A
  • Filed: 03/23/1990
  • Issued: 06/18/1991
  • Est. Priority Date: 03/23/1989
  • Status: Expired due to Term
First Claim
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1. A clock pulse generator comprising:

  • a first clock pulse generating means for generating a first clock pulse signal synchronized with a color burst signal contained in a video signal;

    a second clock pulse generating means for generating a second clock pulse signal synchronized with a horizontal synchronizing signal contained in said video signal;

    a detection means for detecting whether said video signal accords with a predetermined standard or not;

    a phase control means for synchronizing the phase of said second clock pulse signal with the phase of said first clock pulse signal when said detection means makes a decision that said video signal accords with said standard;

    a selection means supplied with said first and second clock pulse signals and for selecting one of said first and second clock pulse signals in accordance with the result of the detection through said detection means; and

    said second clock pulse signal being supplied to a synchronizing signal generating means to make said synchronizing signal generating means generate a synchronizing signal based on said second clock pulse signal, the selected clock pulse signal being supplied from said selection means to a signal processing circuit to make said signal processing circuit perform signal processing upon said video signal based on said selected clock pulse signal.

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