viewing spectrum of an audio signal in matlab

Hello all,

I have an audio signal (.wav) and would like to view its spectrum in matlab. Can anybody help me in this manner?

Thanks in advance.

Answer 1

[Wayne King]

Read it in with wavread()

[signal,fs] = wavread('file.wav');

If signal is Nx2 (two columns), extract one of them

signal = signal(:,1);

If you have the Signal Processing Toolbox, enter

plot(psd(spectrum.periodogram,signal,'Fs',fs,'NFFT',length(signal)));

[Bahareh]

Thanks a lot.

[lapis lapis]

hi ; thanks for this reply ; and what about sound pressur level (SPL) of the acoustic signal, do you have any idea ?? thanks in advance

[Regin Rex Pacaldo]

How can i import my mp3 sound in matlab and analyze it?.

[Priyanka Phadte]

use audioread('filename.mp3') in matlab version 2017

Answer 2

[Ali Isik]

you should first read the audio signal using wavread() function. as a result of reading, the signal will be vectorized. after that, you should use fft() function to get the fourier transform of vectorized signal. at the end plot() the fourier transform of signal. sample code

[xn fs]=wavread('signal_name.wav');
nf=1024; %number of point in DTFT
Y = fft(xn,nf);
f = fs/2*linspace(0,1,nf/2+1);
plot(f,abs(Y(1:nf/2+1)));

[Bahareh]

Thanks a lot.