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Automatic switching circuit for a dual mode television receiver

  • US 4,460,918 A
  • Filed: 07/14/1982
  • Issued: 07/17/1984
  • Est. Priority Date: 07/14/1982
  • Status: Expired due to Term
First Claim
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1. In a television signal receiving apparatus having red, green and blue video output stages, a first input for receiving a composite video signal and a second input for receiving an RGB signal including a sync component and red, green and blue video components, an electronic signal switching circuit comprising:

  • means coupling the red, green and blue video components of the RGB signal from the second input to said red, green and blue video output stages respectively;

    chroma-luma processing means for deriving red, green and blue video components from the composite video signal received at the first input;

    means for coupling said derived red, green and blue video components to said red, green and blue video output stages respectively; and

    composite video blanking means operable in response to the presence of the sync component of the RGB siganl at the second input for blanking said derived red, green and blue video components.

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