How to take the engineering FFT (magnitude spectrum scaled correctly) of Signal in Matlab?
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Hi All
the fft function in matlab gives a theoretical mathematical fft of the signal, and is not scaled to units and is real immaginary and not amplitude-frequency
I think in better terms, I want to plot the amplitude spectrum of the signal,, with the X axis being the frequencies of the input signal.
for example if this is my signal
using the code in the link I get
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/434208/image.png)
which its extremums do not meet the extremums of the time signal
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回答 (1 件)
Walter Roberson
2020 年 11 月 30 日
The unit for the y axis of the discrete fft is the original unit per hertz. You need to integrate it over frequency to get the original unit.
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