1 Jens Blauert, D-Bochum From Binaural Technology to Virtual Reality - Localization Formation of positions of the auditory events (azimuth, elevation, distance, spatial extent), auditory room impression, immersion - Suppression of the directional information coming from reflections (Precedence Effect, localization dominance, fusion), reverberation, coloration and noise - Identification & segregation of auditory streams, e.g., concurrent talkers (Cocktail-Party Effect) Prominent Features of Binaural Hearing - Introduction - Authentic Recording, Transmission & Reproduction - Processing & Analysis of Binaural Signals - Binaural Display & Room Simulation - Interactivity, Virtual Reality - Conclusions From Binaural Technology to Virtual Reality From Binaural Technology to Virtual Reality Authentic Reproduction
9
Embed
From Binaural Technology to Virtual Realitysymphony.arch.rpi.edu/~braasj/.inside/images/classes/RMA/...to Virtual Reality Prominent Features of Binaural Hearing-Localization Formation
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Jens Blauert, D-Bochum
From Binaural Technology to Virtual Reality
Prominent Features of Binaural Hearing
- LocalizationFormation of positions of the auditory events(azimuth, elevation, distance, spatial extent),auditory room impression, immersion
- Suppression ofthe directional information coming from reflections(Precedence Effect, localization dominance, fusion), reverberation, coloration and noise
The SCATIS Glove SCATIS-Hardware Overviewacquired 1995
8
requirements:
“smoothness”frame rate > 16/s(depending on speed ofmovements involved)
“responsiveness”delay < 60 ms
actually achievable with PCs of 2004:40 sound sources, moving at moderate speed.
frame rate 20/sdelay 20 ms
The Problem of “Realtimeability”Lehnert, 1994
List of Events Relevant to the Sound-Field Model
arrival time spectral modification HRTFs
Filter Structure for the Convolution of „Dry“ SignalsDoppler Shifts and Visibility Checkfor Moving Sound Sources
Problems in a TeleconferenceSetting
Perception of One‘s Own VoicePörschmann (2001)
9
Major computational demands arise from the sound-field model whichgenerates realistic room responses, and from the aurilization enginewhich spatializes primary and reflective sounds. With today‘s PCs, up to about 200 sound sources incl. mirror sources can be handled in real time. For distributed sound sources and reverberation dedicated, computationallyeffective algorithms are usually employed.
Virtual Auditory Environments – Auditory DisplaysSome Final Statements:
Vision of a Multimodal Tele-Conferencing System
control rooms !
Generic Application Areas of Binaural Technology− a Summary −
This material is not in the public domain.The author(s) claim(s) all applicable rights.However, permission to copy it is granted under the condition that proper reference is given to the author(s).
Corresponding author:
------------------------------------------------------------Jens Blauert, Professor emeritus of Acoustics
Institute of Communication AcousticsRuhr-Universitaet BochumD-44780 Bochum, Germany