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Color television chroma keying signal generator

  • US 4,051,520 A
  • Filed: 08/09/1976
  • Issued: 09/27/1977
  • Est. Priority Date: 08/20/1975
  • Status: Expired due to Term
First Claim
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1. A colour television chroma keying signal generator comprising a matrix circuit means for supplying to an output a colour signal combination of colour signals supplied to inputs thereof, two signal combination and multiplication circuits coupled to the matrix circuit output, each having an adjustable multiplication factor and output means for providing colour difference signals, a signal adder circuit means coupled to said output means for forming a composite colour difference signal, and a chromaticity signal operated threshold circuit means coupled to the adder circuit for supplying a chroma keying signal to an output of the generator.

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