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Method to assess acoustical two-port properties of earplugs

Hiselius, Per LU (2004) In Acta Acustica united with Acustica 90(1). p.137-151
Abstract
An experimental setup for objective measurements of high impedance objects in ducts, yielding the acoustical Two-Port properties of the object, is presented. The setup has been applied on earplugs. A frequently used experimental setup for measuring objective acoustical properties of earplugs is that of artificial ears. Great effort is spent duplicating the ear of a person. The insertion loss is considered to give the acoustical properties of the object. Such a setup, however, gives a ratio of the 'response of a system' to that of another system. The actual properties of the object are thereby embedded in a complicated artificial response. By instead fitting the test object in a duct, its Two-Port properties can be assessed, given the sound... (More)
An experimental setup for objective measurements of high impedance objects in ducts, yielding the acoustical Two-Port properties of the object, is presented. The setup has been applied on earplugs. A frequently used experimental setup for measuring objective acoustical properties of earplugs is that of artificial ears. Great effort is spent duplicating the ear of a person. The insertion loss is considered to give the acoustical properties of the object. Such a setup, however, gives a ratio of the 'response of a system' to that of another system. The actual properties of the object are thereby embedded in a complicated artificial response. By instead fitting the test object in a duct, its Two-Port properties can be assessed, given the sound pressure level at both sides of the object for two sufficiently different termination impedances. Furthermore, the Two-Port properties of four earplugs have been numerically coupled to a model of the ear in order to predict the insertion loss. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Acta Acustica united with Acustica
volume
90
issue
1
pages
137 - 151
publisher
Hirzel Verlag
external identifiers
  • wos:000188782900015
  • scopus:1242307803
ISSN
1436-7947
language
English
LU publication?
yes
id
2d854b12-2214-4535-aeee-85642032557d (old id 288516)
alternative location
http://openurl.ingenta.com/content?genre=article&issn=1610-1928&volume=90&issue=1&spage=137&epage=151
date added to LUP
2007-10-30 14:47:57
date last changed
2017-01-01 07:02:52
@article{2d854b12-2214-4535-aeee-85642032557d,
  abstract     = {An experimental setup for objective measurements of high impedance objects in ducts, yielding the acoustical Two-Port properties of the object, is presented. The setup has been applied on earplugs. A frequently used experimental setup for measuring objective acoustical properties of earplugs is that of artificial ears. Great effort is spent duplicating the ear of a person. The insertion loss is considered to give the acoustical properties of the object. Such a setup, however, gives a ratio of the 'response of a system' to that of another system. The actual properties of the object are thereby embedded in a complicated artificial response. By instead fitting the test object in a duct, its Two-Port properties can be assessed, given the sound pressure level at both sides of the object for two sufficiently different termination impedances. Furthermore, the Two-Port properties of four earplugs have been numerically coupled to a model of the ear in order to predict the insertion loss.},
  author       = {Hiselius, Per},
  issn         = {1436-7947},
  language     = {eng},
  number       = {1},
  pages        = {137--151},
  publisher    = {Hirzel Verlag},
  series       = {Acta Acustica united with Acustica},
  title        = {Method to assess acoustical two-port properties of earplugs},
  volume       = {90},
  year         = {2004},
}