Electronic Journal Technical Acoustics ISSN 1819-2408

Abdelhafid Kaddour, J. M Rouvaen, M. F. Belbachir

Electrodynamical loudspeaker modelling and characterization

language: English

received 04.12.2003, published 28.12.2003

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ABSTRACT

The modelling and the simulation software are important tools in the design process of radiator systems. Also, for the manufacturers of such systems their characterization is necessary in the quality control. This work deals with the modelling, the simulation and the characterization of an electrodynamical loudspeaker. The measured characteristics are the electrical complex impedance, the frequency response and the Harmonic Distortions (HD) including 2nd , 3rd and Total Harmonic Distortion (THD). Comparisons of computed and measured frequency response and electrical complex impedance are shown. Thiele-Small parameters are deduced from the electrical complex impedance measurement. Besides these characteristics, the visualization of sound fields is useful for understanding the directional radiation of sound emitted from such loudspeaker. For that, the transverse acoustical beam section of sound pressure field is done using acoustic intensity measurement. Matlab based programs are developed for the simulation of these characteristics and for the processing and the visualization of acoustic pressure field.

7 pages, 7 figures

Сitation: Abdelhafid Kaddour, J. M Rouvaen, M. F. Belbachir. Electrodynamical loudspeaker modelling and characterization. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2003, 20.

REFERENCES

[1] L. L. Beranek. Acoustics. American Institute of Physics, Inc., New York , third printing 1990.
[2] A. N. Thiele. “Loudspeaker in vented boxes: Part I”, Loudspeakers: An Anthology J.A.E.S (1953 – 1977), New York , Vol. 1 – Vol. 25, pp. 181–191.
[3] A. N. Thiele. “Loudspeaker in vented boxes: Part II”, Loudspeakers: An Anthology J.A.E.S, (1953 – 1977), New York , Vol. 1 – Vol. 25, pp. 192–204.
[4] R. H. Small. “Direct radiator Loudspeaker system Analysis”, Loudspeakers: An Anthology J.A.E.S, (1953 – 1977), New York , Vol. 1 – Vol. 25, pp. 27.
[5] Bruneau, A. M., Bruneau, M. “Electrodynamic Loudspeaker with Baffle: Motional Impedance and Radiation”, Loudspeakers, Volume 4, An Anthology of Articles on Loudspeakers from the Journal of The Audio Engineering Society. (1984 – 1991), Vol. 32 – Vol. 39, pp. 54–64.
[6] Kaddour, A., Ohtsuki, S. “Distribution de la pression acoustique rayonnee dans un milieu homogene par un transducteur plan”, Int. Conf. Electrical & Electronic Eng. , ICEEE, USTO, Algeria , 1994, pp. 313–318.
[7] Kaddour, A., Rouvaen, J. M., “Comparison of two numerical methods for ultrasonic field modeling”, Acoustics Letters, 2000, Vol. 23, No. 7, pp. 131–136.

		Abdelhafid Kaddour was born in Tlemcen , Algeria. He received the Eng. Degree in Electronics and the Magister Degree in Electroacoustics and Signal Processing from the University of Sciences and Technology of Oran, Algeria. Since 1982 he is a teaching member at the Department of Electronics, U.S.T.O. His current research interest includes audio engineering and visualization of acoustic fields. e-mail: kaddour_a(at)yahoo.com
		Jean Michel Rouvaen was born in 1947, France. He received the Doctorat es Science degree from University of Paris VI in 1976. Currently, he is a Professor of Electronics at ENSI of mechanical energetic, Valenciennes. His research interests include applications of signal processing for telecommunications, ultrasounds, and radar.
		Belbachir Mohamed Faouzi was born in Oran, Algeria. He received the Dipl.El.-Ing. degree, the Master degree, and the these d'etat from the University of Science and Technology of Oran USTO (ORAN, Algeria) respectively in 1976, 1984 and 1991. Since 1981, he is at the Dept of Electronics of USTO. He is currently interested by the filter design and the image processing.