How to find a music signal Fourier transform

% ask for a music signal spectrum

[Y,fs]=audioread (' gem.wav '); % read in a music signal

Plot (Y); % display of music original music waveform

Sound (Y,FS)% play music (at the original frequency) change FS can change the playback frequency

Y1=y (:, 1); % dual channel becomes single lane

Size (Y1)

Figure

Subplot (2,1,1);

Plot (Y); % Display Original signal waveform

N=length (Y1);

F1=fft (Y1); % Fourier transform

W=2/N*[0:N/2-1];

Subplot (2,1,2);

Plot (W,abs (F1 (1:N/2))); % Display waveform

Clear

[X,fs]=audioread (' gem.wav '); % FS Sample Frequency

% T = 1/fs; % Sample Time

L = length (x); % signal length

% T = (0:l-1) *t; % Time Vector

Nfft = 2^nextpow2 (L); % calculated Nextpow2 (l) =18 2^18=262144 slightly greater than L

X = FFT (X,NFFT)/L;

f = fs/2*linspace (0,1,NFFT/2); %linspace (0,1,m) means dividing between 0 and 1 evenly into m parts.

Plot (F,2*abs (X (1:NFFT/2)))

Title (' Y (t) single-sided amplitude spectrum ')

Xlabel (' Frequency (Hz) ')

Ylabel (' | Y (f) | ')

Technical White, write a program about MATLAB about the Fourier transform, to show a novice like me to learn a year of signal and system or do not know what is the use of Fourier transform, what is the point? I hope this program is helpful to others.

This article is from the "9188727" blog, please be sure to keep this source http://9198727.blog.51cto.com/9188727/1588103

How to find a music signal Fourier transform