Acoustic simulation of mobile phone coupled to artificial ear

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Artificial ear is being used to evaluate the acoustic response and the sound quality of the mobile telephony devices, which simulates the practical listening condition of the outer ears. In this paper, a method to estimate the coupled acoustic response of the device with an artificial ear is studied to be effectively used in the design. To this end, an equivalent circuit model of the total receiver system including all accessory elements is established. Acoustic impedance of artificial ear, which is essential in the equivalent model, is directly measured by using three microphones arranged in tandem on the duct wall connected to the artificial ear. Input impedances of two artificial ears, Type 3.3 and 3.4, which are currently employed as the standard devices, are measured. The measured data is incorporated into the model to predict the acoustic response. To validate the proposed model using the measured impedance, the measured acoustic responses of two simulation systems including mobile phone and artificial ear are compared with the predicted ones. A reasonably good agreement between measurement and prediction is observed, and their difference is less than 4.5 dB at the narrow communication band for a mobile phone (f < 3.4 kHz). It is also found that the input impedance of Type 3.3 ear is more robust to the change of measuring condition than Type 3.4 ear. © 2013 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2014-02
Language
English
Article Type
Article
Keywords

LOUDSPEAKER; IMPEDANCE; RADIATION; FLOW

Citation

APPLIED ACOUSTICS, v.76, pp.162 - 168

ISSN
0003-682X
DOI
10.1016/j.apacoust.2013.08.009
URI
http://hdl.handle.net/10203/187087
Appears in Collection
ME-Journal Papers(저널논문)
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