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A Method of Assessing Acoustical Two-Port Properties of Earplugs

Hiselius, Per LU (2002)
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 outer 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, it's two-port parameters can be assessed, given... (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 outer 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, it's two-port parameters can be assessed, given the sound pressure level at both sides of the object for two sufficiently diiferent termination impedances. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Book/Report
publication status
published
subject
keywords
flow impedance, dynamic flow resistance, objective measurement, equivalent circuit, insertion loss, earplugs, HPD, hearing protectors, protection, hearing, attenuation, two-port, four-pole
publisher
[Publisher information missing]
report number
TVBA-3115
ISSN
0281-8477
language
English
LU publication?
yes
id
68aba96f-659e-4f8b-b1a7-361dcd670e63 (old id 526679)
date added to LUP
2016-04-04 09:38:08
date last changed
2018-11-21 20:54:29
@techreport{68aba96f-659e-4f8b-b1a7-361dcd670e63,
  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 outer 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, it's two-port parameters can be assessed, given the sound pressure level at both sides of the object for two sufficiently diiferent termination impedances.}},
  author       = {{Hiselius, Per}},
  institution  = {{[Publisher information missing]}},
  issn         = {{0281-8477}},
  keywords     = {{flow impedance; dynamic flow resistance; objective measurement; equivalent circuit; insertion loss; earplugs; HPD; hearing protectors; protection; hearing; attenuation; two-port; four-pole}},
  language     = {{eng}},
  number       = {{TVBA-3115}},
  title        = {{A Method of Assessing Acoustical Two-Port Properties of Earplugs}},
  year         = {{2002}},
}