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$$$$ DSPR     NOTICE  CHAT      11/09/12    21:15:56     7124           
                                             DATE     11/09/12
                                             
  Operateur DSPR                            Voir aussi :
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    EVOL1 = DSPR  N1 EVOL2 ('FMIN' FLOT1) ('FMAX' FLOT2) (COUL1) ;


    Description :
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    The DSPR operator constructs the curve of spectral power density
 of a signal.

    Contents :
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  N1    : for Fast FOURIER transform, a number of points equal to
          2**N1 (ENTIER type) is used.
          (If the processed signal is longer, it is truncated; if 
          it is shorter, it is completed by a few 0.)

  EVOL2 : object containing the signal to be studied (EVOLUTION type);
          the step of the abscissae must be constant, the values of the
          signal being the ordinates. The object must contain a single
          curve.

 'FMIN' : key word followed by :
  FLOT1 : minimum frequency displayed (FLOTTANT type)
          it will be positive (0 by default)

 'FMAX' : key word followed by :
  FLOT2 : maximum frequency displayed (FLOTTANT type)
          it will be smaller than 1/(2*DT), DT being the time step
          of the input signal
          (default value = maximum value calculated)

  COUL1 : chosen color (white by default) (MOT type)

  EVOL1 : object containing the spectrum (EVOLUTION type)