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http://dx.doi.org/10.5050/KSNVN.2008.18.4.473

Analysis of Total Harmonic Distortion in Microspeaker Considering Coupling Effect  

Kwon, Joong-Hak (부산대학교 기계공학부 기계설계시스템)
Kim, Kwang-Suk (부산대학교 기계공학부 기계설계시스템)
Bang, Ki-Chang (부산대학교 기계공학부 기계설계시스템)
Hwang, Sang-Moon (부산대학교 기계공학부)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.18, no.4, 2008 , pp. 473-479 More about this Journal
Abstract
With the advent of mobile phone, digital multimedia broadcasting(DMB) service is to be realized for multimedia data communication. For an acoustic part, a smaller and lighter microspeaker is also soon to be realized as an MP3 song player and a speakerphone. Sound quality in the microspeaker is becoming more important in mobile phones. It is evaluated by total harmonic distortion(THD). THD is the proportion of higher order frequencies output response to sinusoidal input signal. It is affected by uneven magnetic distribution and nonlinear response of diaphragm. In this paper, harmonic distortion is analyzed by considering magnetic and mechanical coupling effects. Simulated results of THD are compared with experimental data. Results show that THD in lower frequency range is higher due to high displace on voice coil and high mechanical response of high order frequency.
Keywords
Coupling Effect; Microspeaker; Total Harmonic Distortion;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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2 Hong, D. K., Woo, B. C., Ahn, C. W. and Han, G. J., 2005, 'Vibration Analysis of Microspeaker Diaphragm', Proceedings of the KSNVE Annual Spring Conference, pp. 551-554
3 Kinsler, L. E., 1982, Fundamentals of Acoustics, John Wiley & Sons, Inc., New York
4 Hwang, S. M., Lee, H. J., Kwon, J. H, Hwang, G. Y. and Yang, Y. C., 2006, 'Development of Combined Permanent Magnet Type Microspeakers Used for Mobile Phones', Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 16, No. 2, pp. 183-189   과학기술학회마을   DOI   ScienceOn