457374.fig.0017a
(a)
457374.fig.0017b
(b)
Figure 17: Comb filtering effect with the delay of 1 ms. The red curve represent the spectrum of pink noise and the black curve represents the spectrum of pink noise which is added to the delayed version of itself. (a) illustrates the comb filtering effect, when the added signals have the same energy, whereas (b) illustrates the effect when the passive attenuation of the ARA headset is considered.