Analysis of total harmonic distortion in microspeakers considering coupling effect

With the advent of the mobile phone, Digital Multimedia Broadcasting (DMB) service for multimedia data communication will soon be realized. With regard to the acoustic aspects of this service, a smaller and lighter microspeaker also soon will be implemented in MP3 song players and speakerphones. The...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2010, 24(9), , pp.1763-1769
Main Authors: Lee, Chang-Min, Kwon, Joong-Hak, Hwang, Sang-Moon
Format: Article
Language:English
Subjects:
Acoustic signal processing
Acoustics
Control
Dynamical Systems
Engineering
Exact sciences and technology
Frequency ranges
Fundamental areas of phenomenology (including applications)
Harmonic distortion
Industrial and Production Engineering
Joining
Mechanical Engineering
Multimedia
Nonlinearity
Physics
Transduction
acoustical devices for the generation and reproduction of sound
Vibration
Voice
기계공학
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Summary:With the advent of the mobile phone, Digital Multimedia Broadcasting (DMB) service for multimedia data communication will soon be realized. With regard to the acoustic aspects of this service, a smaller and lighter microspeaker also soon will be implemented in MP3 song players and speakerphones. The sound quality of such microspeakers, as evaluated with reference to total harmonic distortion (THD) is becoming more important. THD is the proportion of the higher-order frequency output response to a sinusoidal input signal. It is affected by uneven magnetic distribution and nonlinear responses of diaphragms. In this work, THD was analyzed in consideration of the coupling effects between mechanical vibration and electromagnetic exciting forces. Simulated THD results were compared with the experimental data. The THD in the lower frequency range increased due to the increased displacement of the voice coil and the elevated high-order component response of the sound pressure.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-010-0604-0