Change Power Spectrum to frequency spectrum in Signal Analyzer

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MARCO CESARI 2021-11-17

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回答： Yukthi S 2024-2-15

I'm using Signal Analyzer to compute frequency spectrum, but the app gives me power spectrum in dB, can anyone help to change from power spectrum (dB) in normalized frequency spectrum?

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Answer 1

Yukthi S 2024-2-15

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Hi Marco Cesari

I got that you were trying to compute Frequency spectrum, but the Signal Analyzer app was giving an output of Power Spectrum in dB.

By ‘Frequency spectrum’, I am assuming that you meant plotting a signal’s amplitude or phase in frequency domain. For that purpose,you can use “fft” function available in MATLAB.

y=fft(x)

The Signal Analyzer app is used to just visualise the spectrum in different domains. It is used to explore, analyse and compare signals or regions of interest. You can have a look at the description of Signal Analyzer app here for more insights:

https://in.mathworks.com/help/releases/R2021b/signal/ref/signalanalyzer-app.html?searchHighlight=signal%20analyzer&s_tid=doc_srchtitle#:~:text=all%20in%20page-,Description,-The%20Signal%20Analyzer

You can refer to the below documentation for more information on “fft” function:https://in.mathworks.com/help/releases/R2021b/matlab/ref/fft.html?searchHighlight=fft&s_tid=doc_srchtitle#:~:text=Product%20Updates-,fft,-Fast%20Fourier%20transform