Create the noise vectors (same size as sound array) as follows:

Sinusoidal frequency f1 = 4000 and amplitude A1 = 0.2

Sinusoidal frequency f2 = 5000 and amplitude A1 = 0.25

Now, add the noise vectors to the sound array. Play it. Observe the new spectrum and play the modified array. Finally, convolve the modified array using following vector.

H = [0.0065 0.0103 0.0210 0.0382 0.0599 0.0829 0.1032 0.1171 0.1221 0.1171 0.1032 0.0829 0.0599 0.0382 0.0210 0.0103 0.0065]

Store the output into new array. Observe the output spectrum and play it.