How can I specify the FFT length for the spectrum objects in the Signal Processing Toolbox 6.2 (R14)?

aadisingh - 2021-03-13T13:26:20+00:00

Question: How can I specify the FFT length for the spectrum objects in the Signal Processing Toolbox 6.2 (R14)?

I am using the spectrum.welch objects, and the documentation is not clear on how to specify the FFT length. There is some mention for using "User-Defined" and the dspopts object, but there are not any examples.  

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Expert Answer

Kshitij Singh answered . 2025-11-20

% Sample test data to perform the Welch method on:

t=0:0.001:2*pi;

x=sin(t);

% Initialize the Spectrum and Options objects

Hs=spectrum.welch;

Hopts=dspopts.spectrum;

% Change the options to use user-defined FFT length and Sampling Frequency

set(Hs,'FFTLength','UserDefined');

set(Hopts,'NFFT',512);

set(Hopts,'Fs',1000);

% Display the results

psd(Hs,x,Hopts)

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