[scilab-Users] z^(-1/2) half cycle delay in discrete time

[ray joseph]

Sample twice as fast and that sample will be there.

 

  _____  

From: David PICARD [mailto:d.picard at opgc.univ-bpclermont.fr] 
Sent: Tuesday, May 10, 2011 2:42 AM
To: users at lists.scilab.org
Subject: Re: [scilab-Users] z^(-1/2) half cycle delay in discrete time

 

z^-1 is the  value of the system 1 sampling period in the past. But as
sampling is discrete, does it make sense to reference a value that is
between 2 samples, but that does not exist in your model, since, by
definition, it is not sampled ?


Le 09/05/2011 19:27, Dean Parsons a écrit : 

Hello,

 

I want to add a half cycle delay to a discrete time transfer function by
multiplying the transfer function by z^(-0.5). It seems Scilab doesn't allow
non-integer exponents with the discrete time variable z:

 

-->z=poly(0,"z");
 
-->a = z^(-0.5);
             !--error 30 
Invalid exponent.

Is there a work around for this? Is there another way to create the discrete
time delay z^(-1/2)?

 

Thank you for your help with this.

 

Dean Parsons

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