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$$$$ SPO      NOTICE  CHAT      11/09/12    21:18:10     7124           
                                             DATE     11/09/12
                                             
  Operateur SPO                            Voir aussi :
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    EVOL2 = SPO  EVOL1 'AMOR' LREEL1 ('FREQ' LREEL2) ('TEMP' LREEL3) ...

            ... ('COUL' COUL1)  MOT1 ;


    Description :
    ____________

    This operator enables the user to calculate one or several
 oscillator spectra depending on the given number of dampings
 (one or several).

    Contents :
    __________

    EVOL1    : object containing the excitation signal 
               (EVOLUTION type)

   'AMOR'    : key word followed by :
    LREEL1   : damping value(s) corresponding to the oscillator(s) 
               (LISTREEL type)

   'FREQ'    : key word followed by :
    LREEL2   : object containing the list of frequencies where     
               the user wishes to calculate the maximum displacements
               By default, the list defined as follows is considered :

               i.e;    T  signal duration
                       DT signal mean time step 
                       XSI one value from the list of dampings

               The list of frequencies ranging from 1/T to 1/2*DT is
               considered :

               From 1/T to 1/XSI*T, it is considered that the 
               frequencies have a constant step equal to 1/T.

               From 1/T to 1/2*DT, the step DF varies so that
               DF/F=XSI.
               DF=F(i+1)-F(i) (difference between 2 successive 
               frequencies, F(i) being the value of the ith frequency).

   'TEMP'    : key word followed by :
    LREEL3   : object containing the list of times where the
               user wishes to calculate the displacements (oscillator
               response) (LISTREEL type)
               By default, the list of times of the EVOLUTION object
               containing the excitation completed by zeros on half
               a period is used

   'COUL'    : key word followed by :
    COUL1    : requested color for the curves (MOT type)

    MOT1     : MOT for specifying the type of output:
              'DEPL' : spectrum in displacement
              'VITE' : spectrum in pseudo-velocity
              'ACCE' : spectrum in pseudo-acceleration
              'ACCA' : spectrum in absolute acceleration

    EVOL2    : generated object (EVOLUTION type)