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Visualization, measurement, and inte...

Cheng, Corey I.

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Visualization, measurement, and interpolation of head -related transfer functions (HRTF's) with applications in electro -acoustic music.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Visualization, measurement, and interpolation of head -related transfer functions (HRTF's) with applications in electro -acoustic music./
Author:	Cheng, Corey I.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2001,
Description:	205 p.
Notes:	Source: Dissertations Abstracts International, Volume: 63-11, Section: B.
Contained By:	Dissertations Abstracts International63-11B.
Subject:	Audiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3035271
ISBN:	9780493481807

Visualization, measurement, and interpolation of head -related transfer functions (HRTF's) with applications in electro -acoustic music.
Cheng, Corey I.

Visualization, measurement, and interpolation of head -related transfer functions (HRTF's) with applications in electro -acoustic music. - Ann Arbor : ProQuest Dissertations & Theses, 2001 - 205 p.

Source: Dissertations Abstracts International, Volume: 63-11, Section: B.

Thesis (Ph.D.)--University of Michigan, 2001.

This item must not be sold to any third party vendors.

Head-Related Transfer Functions (HRTF's) describe the directionally dependent acoustic filtering properties of the head, torso, and external ear. HRTF's are typically measured at a finite number of spatial locations at a fixed radius from the head using various acoustic system identification techniques. Since HRTF's presumably contain all of the psychoacoustic cues needed to synthesize spatial sound, these functions can be used to simulate virtual or "3-D" sound for auditory displays. The purpose of this thesis is to investigate the structure of HRTF data with novel 2- and 3-dimensional visualization techniques. We show how simply "looking" at HRTF's in these different ways can suggest how HRTF's can be analyzed and processed in innovative ways for both engineering and musical purposes. We first provide a comparative visualization study of HRTF data in the time, frequency, space, and volume domains. We demonstrate how elevation effects produced by the pinna and diffraction effects produced by head shadowing can be found in all four domains. We then show that visualizing HRTF data sets with spatial and volumetric methods exposes some artifacts introduced into HRTF's during the measurement procedure. We develop an analytical model for this procedure, show how the model accounts for these artifacts, and illustrate how these artifacts can be found in HRTF's measured by the author and HRTF's reported elsewhere in the literature. Visualizing HRTF's with spatial techniques shows that HRTF data resembles responses produced by spatially distributed sensor arrays, or beamformers. We develop an adaptive extension to an existing beamformer model for HRTF's and use the model to investigate some dynamic and cognitive phenomena associated with directional hearing. Finally, we show how interpolation methods used to create spatial domain visualizations can be exploited to compute interpolated HRTF's corresponding to arbitrary spatial locations. We describe a listening experiment designed to evaluate the perceptual quality of the interpolation algorithm. To demonstrate how interpolated HRTF's can be put to creative use, we discuss compositional techniques developed for Fishbowl, an original, binaural composition of electro-acoustic music containing moving sound sources synthesized from interpolated HRTF's. Sound examples can be found on the accompanying CD.* *This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following application: Adobe Acrobat.

ISBN: 9780493481807Subjects--Topical Terms:

537237
Audiology.
Subjects--Index Terms:

Acoustic filtering

Visualization, measurement, and interpolation of head -related transfer functions (HRTF's) with applications in electro -acoustic music.
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500 $a Source: Dissertations Abstracts International, Volume: 63-11, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
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506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Head-Related Transfer Functions (HRTF's) describe the directionally dependent acoustic filtering properties of the head, torso, and external ear. HRTF's are typically measured at a finite number of spatial locations at a fixed radius from the head using various acoustic system identification techniques. Since HRTF's presumably contain all of the psychoacoustic cues needed to synthesize spatial sound, these functions can be used to simulate virtual or "3-D" sound for auditory displays. The purpose of this thesis is to investigate the structure of HRTF data with novel 2- and 3-dimensional visualization techniques. We show how simply "looking" at HRTF's in these different ways can suggest how HRTF's can be analyzed and processed in innovative ways for both engineering and musical purposes. We first provide a comparative visualization study of HRTF data in the time, frequency, space, and volume domains. We demonstrate how elevation effects produced by the pinna and diffraction effects produced by head shadowing can be found in all four domains. We then show that visualizing HRTF data sets with spatial and volumetric methods exposes some artifacts introduced into HRTF's during the measurement procedure. We develop an analytical model for this procedure, show how the model accounts for these artifacts, and illustrate how these artifacts can be found in HRTF's measured by the author and HRTF's reported elsewhere in the literature. Visualizing HRTF's with spatial techniques shows that HRTF data resembles responses produced by spatially distributed sensor arrays, or beamformers. We develop an adaptive extension to an existing beamformer model for HRTF's and use the model to investigate some dynamic and cognitive phenomena associated with directional hearing. Finally, we show how interpolation methods used to create spatial domain visualizations can be exploited to compute interpolated HRTF's corresponding to arbitrary spatial locations. We describe a listening experiment designed to evaluate the perceptual quality of the interpolation algorithm. To demonstrate how interpolated HRTF's can be put to creative use, we discuss compositional techniques developed for Fishbowl, an original, binaural composition of electro-acoustic music containing moving sound sources synthesized from interpolated HRTF's. Sound examples can be found on the accompanying CD.* *This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following application: Adobe Acrobat.
590 $a School code: 0127.
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650 4 $a Music. $3 516178
650 4 $a Electrical engineering. $3 649834
653 $a Acoustic filtering
653 $a Electroacoustic music
653 $a Head-related transfer functions
653 $a Interpolation
653 $a Visualization
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690 $a 0413
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710 2 $a University of Michigan. $3 777416
773 0 $t Dissertations Abstracts International $g 63-11B.
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791 $a Ph.D.
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793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3035271