CODEWITHSUNDEEP
matlabdebugging
user3384232
user3384232

Reputation: 19

How can i plot Fourier transform of a wav without using FFT

How can I plot the Fourier transformation of a wav sound without using FFT?
I take rectangle windows with size 256 on the whole signal.

Following is my code:

My code:

[wave,fs]=wavread('.\Sound clip 32.wav');

sound(wave,fs); 

t=1:1/fs:length(wave)-1/fs;

plot(t,wave);

n=length(wave)-1; 

for l=1:n,

    x(l)=0;
end

for i=1:n,
     for h=1:256,
        x(i)=x(i)+wave(h)*(exp(-(j*2*pi*i*h)/n));
     end
end

f=1:fs/n:n;

wavefft=abs(x); 

plot(f,wavefft);

but I get this error

Error:

??? Error using ==> plot
Vectors must be the same lengths.

Error in ==> alirezabahrami at 8 plot(t,wave);

How can I resolve this problem?

Upvotes: 0

Views: 292

Answers (1)

andrelucas
andrelucas

Reputation: 688

The first plot error is caused by t and wave being different lengths. You could truncate the longest of those two and then plot, but in any case, t is simply a linearly increasing vector, so you can just write

plot (wave)

and it will display the same thing, ie., your audio wave. If you write plot(t) you will just get a diagonal line.

further down you have the exact same problem, so just write:

plot(wavefft)

Upvotes: 2

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