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  Compute the carrier to noise ratio.
  The inputs are the probability of false alarms, probability of detection and 
  number of pulses.

  Run a demo by typing CNRComp. See also FPD.
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   Form:
   cNR = CNRComp( pFA, pD, n )
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   ------
   Inputs
   ------
   pFA           (1,1)  Probability of false alarm
   pD            (1,1)  Probability of detection
   n             (1,:)  Number of pulses

   -------
   Outputs
   -------
   cNR           (1,:)   Carrier to noise ratio

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