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From: Dsrt Egle on 10 May 2010 12:17
Hi guys,

Sorry I have to post this again as I have no clue on the problem and
really need your help.

I have a digital filter block in Simulink built with basic elements
(delay, gain, sum), and it is a fixed-point model (fixed-point format
for each I/O and coefficient is specified). I am trying to estimate
its frequency response, while it seems the spectrum analyzer block
cannot output a nice bode plot. I want an estimated bode plot
comparable to the one by theoretical analysis in fdatool.

I know the "frestimate" in the control toolbox gives very good
frequency response estimation for floating-point system. Is there any
way I can obtain the similar estimation bode plot for the fixed-point
system as "frestimate" for floating-point?

Thanks a lot for your help.
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