T = readtable('aa.csv');
a=table2array(T);
x=a(:,1);
y=a(:,2);
Fs=44100;
L=0.01052;
Y=fft(y);
P2=abs(Y/L);
f = Fs*(x);
plot(f,P2,'b') 
xlabel('f (Hz)')
ylabel('|P1(f)|')