Hostname: page-component-848d4c4894-xm8r8 Total loading time: 0 Render date: 2024-06-26T19:54:17.327Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Kim, Hak Sung, Park, Sang Wook, and Lee, Dai Gil, “Reliable Joining of the Spring Wire to Polymer Composite for the Micro-Multi-Functional Actuator of Cellular Phones,” Composite Structures, 76, pp. 252–289 (2006).CrossRefGoogle Scholar
2. Burdea, G. C., “Force and Touch Feedback for Virtual Reality,” John wiley Sons, Inc., pp. 13–39, New York (1996).Google Scholar
3. Chun, I., Nelson, P. A. and Kim, J. T., “Numerical Models of Miniature Loudspeakers,” presented at the 32nd International Congress and Exposition on Noise Control Engineering,Jeju Island, Korea (2003).Google Scholar
4. Lee, S. H., Kim, J. H., Kim, J. T., Kwon, O. S. and Choi, C. H., “Development of the Simulation Program to Analyze Acoustic Characteristics of a Miniature Type Loudspeaker,” presented at the 32nd International Congress and Exposition on Noise Control Engineering, Jeju Island, Koea (2003).Google Scholar
5. Olson, H., Acoustical Engineering, Van Nostrand, New York, 1957, reprinted by Professional Audio Journals, Philadelphia, PA (1991).CrossRefGoogle Scholar
6. Beranek, L. L., Acoustics, Acoustical Society of America, Woodbury, NY (1996).Google Scholar
7. Leach, W. M. Jr., Introduction to Electroacoustics and Audio Amplifier Design, Kendall-Hunt, Dubuque, IA (2003).Google Scholar
8. Bai, Mingsian R. and Liao, Jerwoei, “Acoustic Analysis and Design of Miniature Loudspeakers for Mobile Phones,” Journal of the Audio Engineering Society, 53, pp. 1061–1076 (2005).Google Scholar
9. Huang, Jin H., Her, Hong-Ching, Shiah, Y. C and Shin, Shaw-Jyh, “Electroacoustic Simulation and Experiment on a Miniature Loudspeaker for Cellular Phones,” Journal of Applied Physics, 103, 033502 (2008).CrossRefGoogle Scholar