In this paper, an electrodynamic planar loudspeaker driven by a digital signal is experimentally discussed. The digital loudspeaker consists of 22 voice coils, 11 permanent magnets, a diaphragm with streamlined sections molded in plastic, and a suspension made of handmade Japanese paper between the diaphragm and the frame. First, the acoustic responses are affected by the arrangement of the voice coils, so an asymmetric arrangement is studied. This asymmetric arrangement is designed to obtain as flat a frequency response to an analog signal as possible. This arrangement is compared with a symmetric one and results show that the flatness of the frequency response around 1 kHz and 4 kHz is improved and that the sound reproduction band is from 40 Hz to 10 kHz. Second, to evaluate the acoustic responses to a digital signal, the digital loudspeaker is driven with a pulse code modulation signal. Results show that the digital loudspeaker can reproduce pure sound with a total harmonic distortion of less than 5% from 40 Hz to 10 kHz, exceeding this value only in a narrow frequency band near 4 kHz. This digital loudspeaker was demonstrated to have good linearity over its dynamic range of 84 dB.
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July 2003
July 03 2003
Acoustic characteristics of an electrodynamic planar digital loudspeaker
Kenji Furihata;
Kenji Furihata
Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan
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Atsushi Hayama;
Atsushi Hayama
Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan
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David K. Asano;
David K. Asano
Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan
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Takesaburo Yanagisawa
Takesaburo Yanagisawa
Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan
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J. Acoust. Soc. Am. 114, 174–184 (2003)
Article history
Received:
July 29 2002
Accepted:
April 14 2003
Citation
Kenji Furihata, Atsushi Hayama, David K. Asano, Takesaburo Yanagisawa; Acoustic characteristics of an electrodynamic planar digital loudspeaker. J. Acoust. Soc. Am. 1 July 2003; 114 (1): 174–184. https://doi.org/10.1121/1.1579004
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