fft with frequency axis on log scale

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Baba 2011-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/20008-fft-with-frequency-axis-on-log-scale

Hello, I have a sampled signal and I'd like to take it's fft with the x axis on log scale. Also, is there anything wrong with the way I'm doing the fft? Thanks

Here's my code

fs=2000;

Hs=spectrum.periodogram; % Use default values

plot(psd(Hs,Signal,'Fs',fs))

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采纳的回答

Wayne King 2011-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/20008-fft-with-frequency-axis-on-log-scale#answer_26414

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Hi, You can just save the output of psd() and use semilogx

fs=2000; 
Hs=spectrum.periodogram; % Use default values 
psdest = psd(Hs,Signal,'Fs',fs);
semilogx(psdest.Frequencies,10*log10(psdest.Data));
grid on;