One Problem with fft command TRIANGLE PLOT?

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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Question posée :

le 23 Mai 2014

Modifié(e) :

le 23 Mai 2014

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