チャンネル間位相差の聴感効果 (<特集>聴覚)

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To investigate the subjective effect of the inter-channel phase difference at the time of hearing synthesized sources, eight loudspeakers were arranged in an anechoic chamber as shown in Fig. 1. Using only the speakers at BL, FL, FR, BR, one adjacent pair, for example FL-BL, were equally excited, but only the phase difference was viried to be 22. 5゜, 45゜, 90゜ and 180゜. The subjects were asked to report the effect upon the bearing-angle width (so-called optic angle) of sound image, their subjective distance from the sound image and angle of elevation of the sound image from a horizontal plane, assuming location at the midpoint of the loudspeakers (L for the FL-BL pair, for example). They were also asked to evaluate the quality of aural sensation, ranging from no change in the quality of the sound image, through small change in the quality, change in the quality causing some feeling of oppression (oppressive effect), up to the judgment of extremely oppressive sensation. Fig. 6 shows the rating of the oppresive sensation for actual sources in various direction. It serves as a standard for the comparison of the oppressive sensation rated when the phase difference exists for the various loudspeaker pairs as shown in Fig. 7. Fig. 8 shows the standard response (actual sound source) regarding sound image width (optic angle), and this should be compared with Fig. 9 showing the effect of the phase difference for the synthesized sources. Data in Fig. 9 are median values for the judgment of width, while the height of ordinates shows the statistical deviation in the judgment of width expressed as interquartile range. The subjective judgment of distance to the sound image was also obtained. The standard response to the actual sound sources is shown in Fig. 10, while the data for the synthesized source with two loudspeakers are shown in Fig. 11. The angle of elevation of the sound image from the horizontal plane results in as shown in Fig. 12. As conclusion, it became clear that the allowable limit of the phase difference is 45゜ in every cases, and that the subjective effects are maximum in front-quadrant and minimum in side-quadrants.
社団法人日本音響学会の論文
1974-03-01

チャンネル間位相差の聴感効果 (<特集>聴覚)

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