The upmix technique to 22.2 multichannel sound from 9 channel, 5 channel, and 3 channel IRs (impulse responses) were studied. The two upmix techniques were used. One is the IRs made from the original IRs converted to phase randomized signals with the same time envelope to original signal and the other is the IRs obtained by simply adding signals of adjacent channels. The experimental stimuli were obtained from these impulse responses convolved to the sound of a xylophone and a female voice recorded in an anechoic room. From the results, there is a tendency of different impression between these two methods, and it is suggested that the phase randomized method may be effective with the case using from less channels.
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