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Illuminant discriminator

  • US 4,827,119 A
  • Filed: 01/28/1988
  • Issued: 05/02/1989
  • Est. Priority Date: 01/28/1988
  • Status: Expired due to Fees
First Claim
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1. An illuminant discriminator comprising:

  • an analog means for converting an impinging illuminant into an analog signal;

    a digital means coupled to said analog means for converting said analog signal into a digital signal; and

    computing means coupled to said digital means for performing a Fourier series analysis on said digital signal to determine the amplitude values of at least one harmonic of said analog signal, said computing means also performing a comparison of the determined amplitude values against the amplitude values of known illuminant sources to identify the type of impinging illuminant.

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