Frequency domain of wvtool - how to replicate?

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Andy
Andy 2016-8-12
编辑： Andy 2016-8-15
I'm trying to obtain the frequency domain (in dB) data of a Kaiser window and I'm unable to duplicate what results from the "wvtool". My code is below. Why does my fft plot not show all the side lobes that are shown in the Frequency Domain of the wvtool GUI?
if true
% code
end
N=100;
w = window(@kaiser,N,1)
figure(1);subplot(1,2,1);
plot(w);
subplot(1,2,2);
plot(db(abs(fft(w))));axis([0 50 -80 40]);
wvtool(w)

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采纳的回答

Honglei Chen
Honglei Chen 2016-8-12
You need more points in there. The default is probably 512 or 1024. Try
plot(db(abs(fft(w,1024))));axis([0 50 -80 40]);
HTH
  1 个评论
Andy
Andy 2016-8-15
编辑：Andy 2016-8-15
Thank you. And just to add a detail - I need to change the "axis" properties to see all the extra lobes:
if true
% code
end
plot(db(abs(fft(w,1024))));axis([0 512 -80 40]);

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