How can I identify the amplitude peaks from an FFT?

Question

Gabriel Magalhães 2021-11-23

评论： Gabriel Magalhães 2021-11-24

The code that I did shows the audio with FFT, now I'm trying to make a function that counts the number of significant frequencies of the chart:

I still don't have much experience with MATLAB, so I need some help to identify these peaks with a code

Answer 1

Chris 2021-11-23

编辑：Chris 2021-11-23

You can use findpeaks, probably with some additional parameters. For instance, if the plotted signal is P:

Z = findpeaks(P,'MinPeakHeight',5);
numPeaks = numel(Z);

See the findpeaks documentation if you need to supply additional criteria as to what counts as a peak.

If you call the function without assigning it to an output, the function will create a plot like you've posted.

findpeaks(P,'MinPeakHeight',5)

Thank you!