clear all, close all

a = audioread('sea-whale-seagull.mp3');

pa = audioplayer(a,11025);
play(pa)

%pause 

b = fft(a,[],1);

figure(1)
subplot(2,1,1)
plot(a(:,1))
subplot(2,1,2)
plot(a(:,2))

figure(2)
subplot(2,1,1)
plot(abs(fftshift(b(:,1))))
subplot(2,1,2)
plot(abs(fftshift(b(:,2))))

c = b;
c(120000:2868597,:) = zeros(2868597-120000+1,2);

figure(3)
subplot(2,1,1)
plot(abs(fftshift(c(:,1))))
subplot(2,1,2)
plot(abs(fftshift(c(:,2))))

d = ifft(c,[],1);

pd = audioplayer(d,11025);
play(pd)