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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카테고리

도움말 센터File Exchange에서 Fourier Analysis and Filtering에 대해 자세히 알아보기

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질문:

2014년 5월 23일

편집:

2014년 5월 23일

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