Jens Blauert, Bochum Binaural Hearing and Human Sound Localization
Embed Size (px)
Transcript of Jens Blauert, Bochum Binaural Hearing and Human Sound Localization
Jens Blauert, BochumBinaural Hearing and Human Sound Localization
Acousticsacoustic event auditory event
Head-Related Coordinate System
Some Key Words
Effect of Head Movement
Binaural Hearing and Human Sound Localization - Introductory remarks - Directional hearing in the median sagittal plane - Directional hearing with sounds from lateral directions - Distance perception and inside-the-head locatedness - Summing localization - Auditory precedence and the echo threshold - The effect of interaural decorrelation - Binaural signal detection - Suppression of reverberance and coloration - Summary
Directional hearing in the median sagittal plane Directional Hearing in the Median Sagittal Plane
Directional Hearing in the Median Planedirectionalbandsboosted bands1/3 octnoise
Directional Hearing with Sounds from Lateral Directions
Lateralization ear axis
Generation of ITDs and ILDsattenuatorsdelay lines
Lateralization Blur for ILDs
Lateralization Due to ILDs
Lateralization Blur for ITDs
ITD-Lateralization Cues right earleft ear
Lateralization due to ITDs (broad-band signals)
Distance Perception Inside-the-Head Locatedness
Summing Localization Auditory Precedence Echoes
Standard Stereo-Listening Arrangement
Summing Localization for Broad-Band Sounds
Ear Signals for Impulsive Sounds in Stereo
Summing Localization with Sideways Loudspeakersafter Plenge & Theile
Auditory Effects with Two Coherent Sound Sources
Summing localization Precedence Effect Echo Threshold broad-bandsoundsprimary auditory eventecho
Precedence Effect, Haas Effect and Backward Inhibitionsignal: running speech of 50 syllables/sdelay of the reflection
The Effect of Interaural Decorrelation
Some Further Key Words
Controlling the Degree of Coherence 3 independentnoise generators
Spatial Extent of the Auditory Event as a Function of Interaural Correlation
after Dubrovski & Cherniak, 1966
The Perceptive Phenomena of Auditory SpaciousnessPioneer researches e.g., Kuhl, West, Marshall, Barron, Schroeder, Morimoto
Binaural Signal Detection Suppression of Reverberanceand Coloration
The Binaural IntellegibilityLevel Difference, BILD
Binaural Suppression of Reverberance
degree of AM, mreverberant chamberreverbanechoicthreshold of perceptibility
- higher localization accuracy, lower blurbetter source segregation (transparency)suppression of undesired signals (cocktail-party effect)suppression of coloration and reverberance (better articulation)>> clearer auditory perspective> better spatial impression
Thank You for Your Attention
More details regarding the topic of this lecture can be found in
Jens Blauert (1997)
Spatial Hearing:The Psychophysics of Human Sound Localization
The MIT Press, Harvard MA, ISBN 0-262-02413-6
Young men and women (about 30 years old) have applied to be admitted to a school for airline pilots.
For being accepted, they must have very good spatial-hearing capabilities.
This is necessary, among other reasons, because they have to respond correctly to signals from auditory displays in the cockpit.
Outline a battery of perceptual tests which could be used to evaluate these capabilities.
(a) What would you measure?(b) Which methods would you apply?(c) What equipment would you need?
The binaural-hearing capabilities of elderly people (over 65 years) are to be evaluated by means of routine screening tests. The goal is to assess their abilities to localize sounds in space and to communicate under acoustically adverse conditions. The information is needed , among other reasons, to decide if hearings aids should be applied to them and, if yes, which kind of these?
Outline a battery of perceptual tests that could be used to evaluate these capabilities.(a) What would you measure?(b) Which methods would you apply?(c) What equipment would you need?