Acoustic Absorption in Vehicles and the Measurement of Short Reverberation Times

Paper #:
  • 971905

Published:
  • 1997-05-20
Citation:
Ebbitt, G. and Rauf, N., "Acoustic Absorption in Vehicles and the Measurement of Short Reverberation Times," SAE Technical Paper 971905, 1997, https://doi.org/10.4271/971905.
Affiliated:
Pages:
7
Abstract:
When characterizing absorption in vehicles, a knowledge of the in situ performance of the acoustical absorbers is often desired. To measure this is a relatively easy task in a large diffuse sound field. However, inside a vehicle where the sound field is not diffuse, the measurement is more difficult. Impulse and interrupted noise techniques have been used to measure absorption inside cavities with extremely short reverberation times. Among several difficulties associated with these techniques are the response time of the filters and the influence of the averager in the instrumentation. In many cases, these limitations make these traditional techniques impractical for use in a vehicle. With the advent of modern digital signal processing, however, there are a number of other readily accessible techniques that are more useful. These include the use of broadband noise based decays that are analyzed in reverse, integrated impulses, time-frequency distributions, and maximal length sequences. The difficulties and benefits associated with each of these techniques will be highlighted in this paper. The usefulness of these techniques in a large reverberant environment will be contrasted with their use inside a vehicle.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
2010-09-28
Training / Education
2013-02-20
Training / Education
2013-04-09
Training / Education
2011-04-12
Technical Paper / Journal Article
2010-09-28