One Problem with fft command TRIANGLE PLOT?

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JOJO
JOJO on 23 May 2014
Edited: JOJO on 23 May 2014
I have taken the fft of a sound file, but it does not show the sinusoidal signal it show some triangles,I put the image of the plot above, what should I do to make it sinusoidal, anyone can help?

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