Problem to use spectrogram on audio file

9 次查看（过去 30 天）
Felipe Toledo Muñoz
评论： Rik 2021-1-4
I need to create a 3D graph with the spectrogram in time, frequency and fourier coefficient of an audio ".wav". I managed to plot time and frequency separately but I still can't implement them in the spectrogram.
This is what I have.
clc
close all;
clear all;
[y,fs]=audioread('test.wav');
% Time
t = linspace (0,length(y)/fs,length(y));
figure;
plot(t,y);
title('Time domain')
xlabel('Time')
ylabel('Amplitud')
% Frequency
L=length(y);
Y = fft(y);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
f = fs*(0:(L/2))/L;
figure;
plot(f,P1)
title('audio FFT');
xlabel('Frequency (Hz)');
ylabel('Amplitud');

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回答（1 个）

Star Strider
Star Strider 2021-1-3
You need to actually call the spectrgram or pspectrum functions!
I do not see that you have called either one in your code. Note that you need to have the Signal Processing Toolbox licensed and installed to use these functions.

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