4. example

In the example below we define a spectral density function (in terms of interspectrum it is a 1 x 1 matrix) with a constant value:

INTEREXC = DEFI_INTE_SPEC (

DIMENSION =1, INFO =2, CONSTANT =_F ( NUME_ORDRE_I =1, NUME_ORDRE_J =1, FREQ_MIN =0. , FREQ_MAX =100. , PAS =1. , PROL_GAUCHE =” CONSTANT “, PROL_DROITE =” CONSTANT “, INTERPOL =” LIN “, VALE_C =( “RI”,1.,0. ), ), );

To define the interspectrum of white noise filtered by an oscillator represented by the KANAI - TAJIMI filter:

DIMENSION =1, INFO =2, KANAI_TAJIMI =_F ( NUME_ORDRE_I =1, NUME_ORDRE_J =1, FREQ_MOY =15. , AMOR =0.05, VALE_R =1. , INTERPOL =” LIN “, PROL_GAUCHE =” CONSTANT “, PROL_DROITE =” CONSTANT “, FREQ_MIN =0. , FREQ_MAX =30. , PAS =5. , ), );

The 3 parameters of the filter were given:

1. depreciation = 0.05,

2. frequency = 15. Hz,

3. level = 1.