The Importance of Phase in the Presence of Sound Source Direction
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As such robot audition, problem of estimating the direction of the sound image from the physical sound signal has high necessity. In order to develop an estimation system of the direction of sound image corresponding to the multiple sound sources, it is necessary to know the behavior of the precedence effect in comprehensive sound source arrangement. So, we investigated the influence of the sound source arrangement on the precedence effect experimentally. The minimum angle between the directions of two sound sources is 30 degrees. Experimental method is a three Alternative Forced Choice Task. The three choices are in the direction of two sound sources and its intermediate. In the case of a bilaterally symmetrical arrangement of sound sources, our experimental results were in good agreement with the findings obtained in previous studies. However, our experimental results show that deviation of the localized direction of sound image is dependent on the sound image arrangement. Particularly, in the case of left-right asymmetrical and front-back symmetrical arrangement, shift of a sound image direction with respect to time difference had a characteristic trend.
Precedence effect
Directional sound
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Sound propagation
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One solution to reproduce sound from various directions is the projection of sound sources on reflective boundaries. In this case the perceived direction of the auditory event changes from the direction of the real source to the direction of the projected source. Therefore, highly focused sound sources are necessary. However, the focusing capabilities of such sources are physically limited. Thus, the total amount of sound at the listening position is formed by the projected sound and by sound which is directly radiated from the real source. Both of these sound proportions influence the perception of the listener. The present study investigates in which way the direct sound contributes to the auditory event in different scenarios with projected sound sources. It will be shown, that an increasing direct sound level leads to a separation of the auditory events in to parts which are located in different directions. However, this separation does not necessarily affect the effect of sound source projection.
Precedence effect
Directional sound
Source Separation
Position (finance)
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Secondary source
Sound transmission class
Point source
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