The effect of the sound source characteristics for the impression of multichannel sound systems were examined through two experiments tested whether the difference in the number of channels can be signi?cantly perceived. The results of experiment 1, concluded that the number of channel combinations with a low percentage of correct answers was the largest in a xylophone single tone, and the smallest in a cello phrase. In experiment 2, we focused on the harmonic structure of the sound source, and experimented using saw-waves with a different number of overtones and a pink-noise. As a result, it was found that the temporal change of re?ection sound energy on the lateral and above, and time variation of IACC, affect the channel number discrimination.
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