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$$$$ SIGNSYNT NOTICE  CHAT      11/09/12    21:18:05     7124           
                                             DATE     11/09/12

  Procedure SIGNSYNT                       Voir aussi :
    ------------------   
    EV01 =  SIGNSYNT  MOT1  TAB1


    Description :
    _____________

    The SIGNSYNT procedure creates synthetic signals by the
 recombination of random phase sinusoids. There are two possible
 options :
                     FABR   ET  BLAN

    Contents :
    __________

    MOT1  :  key word (MOT type) characterizing the requested
             output
    TAB1  :  TABLE type object
    EVO1  :  created signal(s)

  1-OPTION   creation of synthetic signals from a spectrum of
             reference

   MOT1 = FABR

   TAB1 'MOTIT'            (MOT type)      text not exceeding 16 
                                           characters

   TAB1 'SEISME' 'SPECTRE' (EVOL type)     spectrum of reference
   TAB1 'SEISME' 'AMORT'   (FLOTTANT type) damping
   TAB1 'SEISME' 'TYPSP'   (MOT type)      spectrum type 
                                           'ACCE' 'VITE' or 'DEPL'

   TAB1 'SIGNAL'   'ENVE'     (MOT type)   optional : envelope
                                           type = 'PLATLIN'
                                           by default constant
                                           envelope   
   TAB1 'SIGNAL'   'NP'     (ENTIER type)   such as the number of points
                                            of the signal : 2 ** NP
   TAB1 'SIGNAL'   'DUREE'  (FLOTTANT type)  signal duration
   TAB1 'SIGNAL'   'TDEBUT' (FLOTTANT type)  beginning of the plateau
   TAB1 'SIGNAL'   'TFIN'   (FLOTTANT type)  end of the plateau

Signal
   ^
   |     --------
   |   /          \
   |  /            \
   | /              \
   |----|--------|---|-----> time
        tbegin- tend T
         ning

   TAB1 'NBITER'           (ENTIER type)   number of requested 
                                           iterations
   TAB1 'NBSIGN'           (ENTIER type)   number of signals
   TAB1 'NALEAT'           (ENTIER type)   parameter for phase
                                           initialization
   TAB1 'FRCOUP'           (FLOTTANT type) cut frequency
   TAB1 'OPTSORT'          (MOT type)      option for intermediate
                                           outputs :
                                           SPECTRE : at each iteration
                                               the obtained spectra 
                                               will be output
                                           SIGNAUX  : at each iteration
                                               the spectra and signals
                                               will be output

       ++ OUTPUT RESULT

   EV01              (TABLE type)          contains the generated
                                           signal(s)
                                           (standard deviation unit)

 2-OPTION  white-noise signal by the combination of random phase
           sinusoids

   MOT1 =  BLANC

   TAB1 'MOTIT'            (MOT type)      text not exceeding 16 
                                           characters
   TAB1 'NP'               (ENTIER type)   number of points =  2 ** NP
   TAB1 'DELTAF'           (FLOTTANT type) step in frequency
   TAB1 'NALEAT'           (ENTIER type)   parameter for phase
                                           initialization

       ++ OUTPUT RESULT

   EV01              (EVOLUTION type)      contains the generated 
                                           signal
                                           (standard deviation unit)

       NOTES
       ---------
    The method for generating signals uses the TFR.
    2 ** NP points must be used.

    The spectrum of reference must cover the interval :
     fmin <  1 / T with T  signal duration
     fmax > 1 / (2 * DT)  with DT = T / (2 ** NP)