Type of Document	Master's Thesis
Author	Stanley, Raymond Mason
URN	etd-11022006-103809
Title	Toward adapting spatial audio displays for use with bone conduction: The cancellation of bone-conducted and air-conducted sound waves.
Degree	Master of Science
Department	Psychology
Advisory Committee	Advisor Name Title Walker, Bruce Committee Chair Corso, Gregory Committee Member Davis, Elizabeth Committee Member
Keywords	interaural attenuation bone-conduction hearing bone-conduction headsets air-to-bone shifts psychophysics sound cancellation bone conduction spatial audio
Date of Defense	2006-08-18
Availability	unrestricted
Abstract Virtual three-dimensional (3D) auditory displays utilize signal-processing techniques to alter sounds presented through headphones so that they seem to originate from specific spatial locations around the listener. In some circumstances bone-conduction headsets (bonephones) can provide an alternative sound presentation mechanism. However, existing 3D audio rendering algorithms need to be adjusted to use bonephones rather than headphones. This study provided anchor points for a function of shift values that could be used to adapt virtual 3D auditory displays for use with bonephones. The shift values were established by having participants adjust phase and amplitude of two waves in order to cancel out the signal and thus produce silence. These adjustments occurred in a listening environment consisting of air-conducted and bone-conducted tones, as well as air- conducted masking. Performance in the calibration condition suggested that participants understood the task, and could do this task with reasonable accuracy. In the bone-to-air listening conditions, the data produced a clear set of anchor points for an amplitude shift function. The data did not reveal, however, anchor points for a phase shift function – the data for phase were highly variable and inconsistent. Application of shifts, as well as future research to establish full functions and better understand phase are discussed, in addition to validation and follow-up studies.
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