Abstract
It had been proposed by Bauer [J. Acoust. Soc. Am. 33, 1536–1539 (1961)] that two loudspeakers of different source strengths in the horizontal plane could be used to produce a virtual sound image, located at other than the actual source location. It is shown here that, due to the diffraction of sound by the head, this particular method produces simultaneous and interdependent interaural time (ITD) and level differences (ILD). The particular ITDs and ILDs produced by Bauer's method do not generally correspond to a unique spatial location and therefore produce potentially conflicting localization cues. This difficulty is aggravated by unbalancing the hearing aid gains or their phase response. It appears from the study by A. Nabelek, T. Letowski, and D. Mason [J. Speech Hear. Res. 23, 670–687 (1980)] that aided listeners position the sound image on the basis of interaural time differences. The role of interaural pressure level differences on the positioning of sound images could not be established unambiguously from these data.
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