@book{68aba96f659e4f8bb1a7361dcd670e63,
title = "A Method of Assessing Acoustical Two-Port Properties of Earplugs",
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.",
keywords = "flow impedance, dynamic flow resistance, objective measurement, equivalent circuit, insertion loss, earplugs, HPD, hearing protectors, protection, hearing, attenuation, two-port, four-pole",
author = "Per Hiselius",
year = "2002",
language = "English",
volume = "TVBA-3115",
publisher = "[Publisher information missing]",
}