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The First Damped Frequency with Maximum Sound Pressure of a Miniature Loudspeaker for Cellular Phones

Published online by Cambridge University Press:  28 September 2011

Y. C. Shiah ,
Jin H. Huang  and
Y.-L. Xue
Y. C. Shiah*
Affiliation:
Graduate Program of Electro-acoustics, Feng Chia Univesrity, Taichung, Taiwan40724, R.O.C.
Jin H. Huang*
Affiliation:
Graduate Program of Electro-acoustics, Feng Chia Univesrity, Taichung, Taiwan40724, R.O.C.
Y.-L. Xue*
Affiliation:
Department of Aerospace Engineering and Engineering Mechanics, Feng Chia Univesrity, Taichung, Taiwan40724, R.O.C.
*
* Professor, corresponding author
** Professor
*** Graduate student
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Abstract

For improving the performance of a miniature loudspeaker, engineers have been pursuing a goal of lowering its first damped frequency to have a broad and smooth region of its sound-pressure-level response. This article applies the approach of electro-mechano-acoustical analogy to study the first damped frequency of a miniature loudspeaker used for cellular phones. Using the analogy approach, the authors derive an explicit formulation for the sound-pressure-level of a typical miniature loudspeaker of dynamic type. The veracity of the derived formulation is verified by comparing with the experimental result recorded by B and K apparatus. The derived formulation is further simplified by neglecting factors that are either irrelevant or insignificant for the first damped frequency. Through basic algebraic and calculus operations, this article also presents an explicit form of the first damped frequency. This work has laid the platform for engineers to tailor the design in pursuit of improving the performance of miniature loudspeakers.

Keywords

Miniature loudspeakerElectro-mechano-acoustical analogySound-pressure-level
Type
Research Article
Information
Journal of Mechanics , Volume 26 , Issue 4 , December 2010 , pp. 473 - 482
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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References

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