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Perform FFTW of a song

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Cesar Lobo
Cesar Lobo 2020-11-29
回答： Mathieu NOE 2020-11-30
Hi there. I was wondering if someone here could help me write a code to performe a fft of a song. i im trying to write a code to perfrorm the fft because i want to use the tranfromation to make a motor vibrate according to the frequency output. i have tried a few codes i found but none of them work.
so basically the code consists of having an imported song file and then the fft of the same.
I can plot the amplitude vs time graph, but i dont know how to plot the amplitude vs frequency graph.... I know i have to to the fft, but from there im confused.
clc
[y, fs] = audioread('C:\Users\cesar\Dropbox\My PC (LAPTOP-JN8DA0O5)\Downloads\cb.mp3');
%-----------------------------------------------
tD = (1 : length(y)) / fs;
tDouble1 = tD / 60;
tvar = datetime(0,0,0) + minutes(tD);
%---------------------------------------------
t = 0:0.001:tD;
N = size(t,1);
X = fftshift(fft(y));
dF = fs/N;
r=abs(X)/N;
f = -fs/2:dF:fs/2-dF;
figure(1)
plot(tvar, y(:, 1))
figure(2)
plot(r,f);
xlabel('Frequency (Hz)');
ylabel('Amplitude');
title('Magnitude');

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采纳的回答

Mathieu NOE
Mathieu NOE 2020-11-30
hello
I have exactly what you need ! you lucky man !
enjoy it

更多回答（1 个）

Bjorn Gustavsson
Bjorn Gustavsson 2020-11-30
Instead of using the fft, that calculates one fourier-transform of the entire time-series, have a look at the spectrogram function that will allow you to calculate the spectral components over shorter periods of time, it uses windowed short-time-fourier-transforms. That way you might have an easier time to match the frequencies to the melody (beat?) of your song.
HTH

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