How to shift the pwelch plot

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Xiaojia
Xiaojia 2011-11-21
Hi,
I am using the pwelch function to plot signal power spectrum density. Similar to the function "fftshift", I want the first half of the spectrum swapped with second half to put the zero-frequency value in the middle. But I dont know how to do it on the pwelch. Can any one give me some suggestions?
Thanks.

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回答（2 个）

bym
bym 2011-11-21
pwelch calculates a one sided spectrum by default, therefore, no shifting is required. You can use the option 'twosided' to get the two sided PSD
Wayne King
Wayne King 2011-11-21
If you really want DC to be in the middle, you can do this.
Fs = 1e3;
t = 0:1/Fs:1-1/Fs;
x = cos(2*pi*100*t)+randn(size(t));
plot(psd(spectrum.welch,x,'Fs',Fs,'CenterDC',true));

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