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How to plot bode plot from FFT data

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SACHIN DEVASSY
SACHIN DEVASSY 2013-9-30
评论： Arkadiy Turevskiy 2013-10-1
Hi, I would like to get bode plot from FFT data. How do I convert the data obtained(complex values) so that it can be used by the 'bode' function in matlab.
Thanking you.

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回答（1 个）

Arkadiy Turevskiy
Arkadiy Turevskiy 2013-9-30
You need to create an frd object.
here is example code from doc page.
% generate a frequency vector and response data
freq = logspace(1,2);
resp = .05*(freq).*exp(i*2*freq);
% Create a FRD model
sys = frd(resp,freq);
Now simply do
bode(sys)
  2 个评论
SACHIN DEVASSY
SACHIN DEVASSY 2013-10-1
Thanks Arkadiy for the reply. However, I am unable to understand how to make frd data from fft data. I got lets say ,following data points after doing fft [2+2j,1-3j,4, 5+4j]. How do i convert this into frd. Thanking you.
Arkadiy Turevskiy
Arkadiy Turevskiy 2013-10-1
resp=[2+2j,1-3j,4, 5+4j];
freq= % enter the frequency values at which the corresponding fft
% values are obtained
sys=frd*resp,freq);

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