Spatial Sound Proliferation: Towards Individualized Binaural Sound.


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Spatial sound generation. Binaural sound through earphones. Neglected to satisfy guarantee ... Objective is earphone framework which is perceptually undefined from ...
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Slide 1

Spatial Audio Reproduction: Towards Individualized Binaural Sound Bill Gardner Wave Arts, Inc .

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Overview Spatial sound generation Binaural sound by means of earphones Failed to satisfy guarantee What should be possible to settle Other spatial proliferation advancements

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Binaural sound Recording or imitating signals at the ears Binaural sound recorded and repeated at your own ears is stunningly practical Signals at two eardrums totally characterize sound-related experience Goal is earphone framework which is perceptually vague from genuine tuning in

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Spatial listening to Sound communicates with middle, head, outside ears and touches base at the two ear trenches Localization prompts: Time Amplitude Spectrum Dynamic signals

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Head-Related Transfer Function (HRTF) Describes change of sound from free-field to ear

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HRTF azimuth reliance

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HRTF height reliance Concha

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Concha reflection at 0 deg rise

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Concha reflection at 45 deg rise

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HRTFs from three people External ears fluctuate between people High recurrence prompts are particular HRTFs gave by IRCAM

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Measurement Synthesis Binaural amalgamation

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Perceptual acceptance Localization tests Using individualized HRTFs Localization execution unaltered from genuine tuning in (Wightman and Kistler, 1989) Using non-individualized HRTFs Elevation mistakes Front/back inversions (Wenzel et al., 1993) Lack of externalization (sounds are seen close head or inside head)

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Improving externalization Dynamic head following Artificial resonation

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Real/virtual segregation tests Apparatus permits direct examination of genuine and virtual jolts (Hartmann and Wittenberg, 1996) Virtual boosts can be altered to decide furthest reaches of recognition Individualized HRTFs required for externalization

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How to get individualized HRTFs? Acoustic estimation illogical Would like quick, functional technique Measurements of audience Based on picture of head and ears Calibration system

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Statistical investigation Analyze sets of HRTFs to tease out low dimensional models PCA examination of HRTFs (Kistler and Wightman, 1992) 5 main segments adequate to repeat individualized HRTFs Parameters should be resolved for every area and audience

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Boundary component strategy (Kahana, 1998) 15,000 component model matches acoustical estimations precisely to 15 kHz Scanning head is troublesome Computational demonstrating

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Deformable head model? Begin with refined head network model Obtain subject\'s estimations utilizing PC vision procedures Morph network model to fit estimations Calculate HRTFs utilizing computational acoustics

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Crosstalk-drop sound Deliver binaural sound to audience by means of stereo amplifiers Requires pre-preparing to wipe out crosstalk Works at low frequencies Listener must be settled or followed

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Multichannel sound 5.1 and 7.1 encompass frameworks produced for motion picture theaters are presently generally utilized as a part of homes Emphasis on frontal confinement Doesn\'t require individualization

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Ultrasonic sound Highly directional ultrasonic pillar makes capable of being heard sound (Pompei, 1999) Based on non-straight properties of air Tones between balance at high force

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Ultrasonic sound 80 kHz and 81 kHz tones will create capable of being heard 1 kHz contrast tone Requires pre-handling to diminish twisting Acceptable loyalty, poor low recurrence reaction

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Summary Discussed spatial sound proliferation strategies Binaural sound has guarantee for sound generation vague from genuine listening Requires individualized playback Proposed strategy to individualize playback for a specific audience

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