Jens Blauert, Bochum Binaural Hearing and Human Sound Localization

download Jens Blauert, Bochum Binaural Hearing and Human Sound Localization

of 37

  • date post

    04-Jan-2016
  • Category

    Documents

  • view

    223
  • download

    1

Embed Size (px)

Transcript of Jens Blauert, Bochum Binaural Hearing and Human Sound Localization

  • Jens Blauert, BochumBinaural Hearing and Human Sound Localization

  • PhysicsPsychophysics

    soundssensationsPsychophysicssensationsPhysicssounds

    (akn)to hear

    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

    Cherrys Experiment

  • Binaural Suppression of Reverberance

    Danilenkos Experiment

    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
  • jens.blauert@rub.de www.ruhr-uni-bochum.de/ika

    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

    published by

    The MIT Press, Harvard MA, ISBN 0-262-02413-6

  • TASK A

    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?

  • TASK B

    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?