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The Impact of System Latency on Dynamic Performance In Virtual Acoustic EnvironmentsEngineering constraints that may be encountered when implementing interactive virtual acoustic displays are examined In particular, system parameters such as the update rate and total system latency are defined and the impact they may have on perception is discussed. For example, examination of the head motions that listeners used to aid localization in a previous study suggests that some head motions may be as fast as about 400 degrees/sec for short time periods. Analysis of latencies in virtual acoustic environments (VAEs) suggests that: (1) commonly-specified parameters such as the audio update rate determine only the "best-case" latency possible in a VAE, (2) total system latency and individual latencies of system components, including head-trackers, are frequently not measured by VAE developers, and (3) typical system latencies may result in under-sampling of relative listener-source motion of 400 degrees/sec as well as positional "jitter" in the simulated source. To clearly specify the dynamic performance of a particular VAE, users and developers need to make measurements of average system latency, update rate, and their variability using standardized rendering scenarios. a parameters such as the minimum audible movement angle can then be used as target guidelines to assess whether a given system meets perceptual requirements.
Document ID
20020051541
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Wenzel, Elizabeth M.
(NASA Ames Research Center Moffett Field, CA United States)
Ahumada, Albert
Date Acquired
August 20, 2013
Publication Date
January 1, 1998
Subject Category
Acoustics
Meeting Information
Meeting: Acoustical Society of America Conference
Location: Seattle, WA
Country: United States
Start Date: June 20, 1998
End Date: June 28, 1998
Sponsors: Acoustical Society of America
Funding Number(s)
PROJECT: RTOP 548-50-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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