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about audio fft shape

Asked by EUNBAE LEE on 18 May 2019
Ideal shape is...
푸리에 예시.png
but my graph and code are ...
내가 한거.png
[data,Fs]=audioread('1st pipe sound.m4a');
N=length(data);
ts=1/Fs;
t=0:ts:N*ts-ts;
F=0:Fs/N:Fs-Fs/N;
FFT_data=fft(data);
subplot(1,2,1)
plot(t,data);
xlabel('time[sec]')
ylabel('Amplitude')
title('1st pipe sound')
subplot(1,2,2)
plot(F,abs(FFT_data)/N);
xlabel('Frequency')
ylabel('Amplitude')
title('1st sound fft result')

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