How to use the Matlab command FFT to convert voice time domian to frequency domain?

[jakjoud]

fft matlab example

Really I don't understand this just make sure you did write the code rightly and please can you upload the wave file?

 

[fzhang]

matlab fft remove dc component

I used to used single tone to verify my matlab scripts. hope it help.

 

[intelnside]

matlab fft(archivo.wav)

this is my wav...

 

[jakjoud]

matlab negative part

Ok try this code I think it does work. I tried it with your wav file and this what it gives

[x fs]=wavread('D:\voice\stop8');
Fs=fs/2;
dt=1/Fs;%% time interval
t=(1:length(x))*dt; %%time vector

X=fft(x);
df=1/(length(x)*dt); %% frequency interval
f=(1:length(X))*df;%% frequency vector

%%
%%% time domain plot, time in seconds
figure
plot(t,x)
xlabel('Time (s)');
ylabel('Amplitude');
grid on

f1=f(1:length(X)/2+1);
Y=X(1:length(X)/2+1);

%% frequency domain plot, freq in hertz
figure
semilogy(f1,abs(Y));
title('stop')
xlabel('frequency(hz)');
ylabel('amplitude');
grid on

%%
figure
semilogy(f1,20*log10(abs(Y(1:length(Y)))+eps));
title('stop')
xlabel('frequency(hz)');
ylabel('amplitude(db)');
legend('fft');
grid on;

 

[intelnside]

fft voice

u already try my wav file?

Added after 7 minutes:

i saw the website, they got his frequency..

Added after 5 minutes:

thank jakjoud, u helping me alot...
can u plot the freq same like this?

Added after 3 minutes:

jakjoud, i think your correct, anyway thank you very much...