Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-25T06:00:26.313Z Has data issue: false hasContentIssue false
  • English
  • Français

Bass Extension of Microspeaker System on Mobile Device

Published online by Cambridge University Press:  02 August 2018

J. R. Chang  and
C. N. Wang
J. R. Chang*
Affiliation:
Department of Engineering Science and Ocean Engineering National Taiwan University Taipei, Taiwan
C. N. Wang
Affiliation:
Department of Engineering Science and Ocean Engineering National Taiwan University Taipei, Taiwan
*
* Corresponding author ([email protected])
Get access

Abstract

This study provides a solution for the bass extension of a microspeaker system in a mobile device that involves using a resonant combination of a front chamber and a rectangular, long, pipe-shaped port. The efficient resonant coupling of the microspeaker system to the acoustic load in this structure enables a microspeaker with modest cone displacement to achieve a high sound pressure level (SPL) and bass extension below the resonance of the microspeaker in free air, and the total dimensions of the structure are minimized. A combination of electro-mechanic-acoustic and finite element methods was applied to determine the SPL and bass extension levels for mobile devices. Simulation results show acceptable agreement with experimental results. A suitable extended-range microspeaker system was applied in a 10 inch tablet. The audio frequency response could be extended from 630 to 300 Hz with the greatest loudness. As much as possible add low bound frequency extension to make the article more clear. Finally, five cases of parameter settings for the front chamber volume, rear chamber volume, rectangular pipe-shaped port, cross-sectional area, and opening area were studied. The results can be applied for optimizing a suitable extended-range microspeaker system.

Keywords

A suitable extended-range microspeaker systemMirospeakerMobile deviceBass extension
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 4 , August 2019 , pp. 487 - 498
Copyright
© The Society of Theoretical and Applied Mechanics 2018 

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

Thuras, A. L., “Sound Translating Device,” U.S. patent 1,869,178 (filed 1930; awarded 1932).Google Scholar
de Boer, E., “Synthesis of Bass-Reflex Loudspeaker Enclosures,” The Journal of the Acoustical Society of America, 31, pp. 246 (1959).CrossRefGoogle Scholar
Thiele, A., “Loudspeakers in Vented Boxes,” Journal of the Audio Engineering Society, 19, pp. 382–392 (1971).Google Scholar
Benson, J. E., “Theory and Design of Loudspeaker Enclosures, Part 1: Electroacoustical Relations and Generalised Analysis,” Amalgamated Wireless Australasia Technical Review, 14, pp. 1–58 (1968).Google Scholar
Benson, J. E., “Theory and Design of Loudspeaker Enclosures, Part 2: Response Relationships for Infinite Baffle and Closed Box Systems,” Amalgamated Wireless Australasia Technical Review, 14, pp. 225–293 (1971).Google Scholar
Benson, J. E., “Theory and Design of Loudspeaker Enclosures, Part 3: Introduction to Synthesis of Vented Systems,” Amalgamated Wireless Australasia Technical Review, 14, pp. 369–484 (1972).Google Scholar
Small, R. H., “Direct-Radiator Loudspeaker Systems Analysis,” IEEE Transactions on Audio and Electroacoustics, 19, pp. 269–281 (1971).CrossRefGoogle Scholar
Small, R. H., “Closed-Box Loudspeaker Systems, Part 1: Analysis,” Journal of the Audio Engineering Society, 20, pp. 798–808 (1972).Google Scholar
Small, R. H., “Closed-Box Loudspeaker Systems, Part 2: Synthesis,” Journal of the Audio Engineering Society, 21, pp. 11–18 (1973).Google Scholar
Small, R. H., “Vented-Box Loudspeaker Systems, Part 1: Small-Signal Analysis,” Journal of the Audio Engineering Society, 21, pp. 363–372 (1973).Google Scholar
Small, R. H., “Vented-Box Loudspeaker Systems, Part 2: Large-Signal Analysis,” Journal of the Audio Engineering Society, 21, pp. 438–444 (1973).Google Scholar
Small, R. H., “Vented-Box Loudspeaker Systems, Part 3: Synthesis,” Journal of the Audio Engineering Society, 21, pp. 549–554 (1973).Google Scholar
Small, R. H., “Vented-Box Loudspeaker Systems, Part 4: Appendices,” Journal of the Audio Engineering Society, 21, pp. 635–639 (1973).Google Scholar
Small, R. H., “Passive-Radiator Loudspeaker Systems, Part 1: Analysis,” Journal of the Audio Engineering Society, 22, pp. 592–601 (1974).Google Scholar
Small, R. H., “Passive-Radiator Loudspeaker Systems, Part 2: Synthesis,” Journal of the Audio Engineering Society, 22, pp. 683–689 (1974).Google Scholar
D’Alton, A., “Acoustic Device,” U.S. patent 1,969,704 (filed 1933; awarded 1934).Google Scholar
Lang, H. C., “Sound Reproducing System,” U.S. patent 2,689,016 (filed 1953; awarded 1954).Google Scholar
Fincham, L. R., “A Bandpass Loudspeaker Enclosure,” Presented at the 63rd Convention of the Audio Engineering Society, Journal of the Audio Engineering Society, 27, p. 600 (1979).Google Scholar
Geddes, E. R., “An Introduction to Band-Pass Loudspeaker Systems,” Journal of the Audio Engineering Society, 37, pp. 308–342 (1989).Google Scholar
Backman, J., “A Computational Model of Transmission Line Loudspeakers,” Presented at the 92nd Convention of the Audio Engineering Society, Journal of the Audio Engineering Society, 40, p. 438 (1992).Google Scholar
Berkhoff, A. P., “Impedance Analysis of Subwoofer Systems,” Journal of the Audio Engineering Society, 42, pp. 4–14 (1994).Google Scholar
Fahy, F., Foundations of Engineering Acoustic, Academic Press (2001).Google Scholar
Beranek, L. L., Acoustics, Acoustical Society of America, Woodybury, NY (1996).Google Scholar
Colloms, M., High Performance Loudspeakers, 5th Edition, John Wiley & Sons, NY (1997).Google Scholar
Kinsler, L. E., Frey, A. R., Coppens, A. B. and Sanders, J. V., Fundamentals of Acoustics, 4th Edition, John Wiley & Sons, NY (2000).Google Scholar
Chang, J. R. and Wang, C. N., “Acoustical Analysis of Enclosure Design Parameters for Microspeaker System,” Journal of Mechanics, DOI:10.1017/jmech.2017.64 (2017).CrossRefGoogle Scholar