[Scilab-users] Bode of discret time transfer function.

[Serge Steer]

Le 25/02/2017 à 19:17, Pablo Fonovich a écrit :
>
> Hi:
>
> This is the first time i work with discrete time transfers functions 
> and Scilab.
>
> I want to use bode() for plotting the magnitud and phase response of 
> the system, however, i don't understand how to set the frequencies to 
> normalized values (-pi, pi).
>
> This is what i'm doing:
>
>
> s=poly(0,'s')
> H=(s^(-2400))/(1-0.5*s^(-2400))
> S=syslin('d',H)
> bode(S)
>
>
> i get a warning that frequencies beyond nyquist rate are ignored and 
> the resulting plot is attached.
>
>
> In the help, it says that bode parameter could include fmin and fmax 
> in herz, but isn't a discrete system response limited to normalized 
> frequencies? And to transform the normalized frecuency to herz the 
> sample rate must be used, but i don't know how to pass it to the 
> system or something.
>
S=syslin(dt,H) defines a dynamical system sampled. dt beeing the 
sampling period in second.
If you want the frequency uniis be in rd/s add "rad" as last input argument
>
> Any hints would be appreciated.
>
> Thanks
>
>
>
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