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Built-In Speaker Car Sound System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1992 by SAE International in United States
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The acoustic characteristics of the sound field inside a vehicle cabin were analyzed. On the basis of the analysis results, a three-way horn speaker system for vehicles was developed, comprising a woofer, a mid-range, and a tweeter.
For a woofer, we developed a speaker system utilizing resonation of acoustic tubes, in which the acoustic tubes provide acoustic impedance well matched to the acoustic impedance of a vehicle cabin space. In this paper, to identify the influence of standing waves inside a vehicle cabin, we evaluate the sound field reactivity in terms between sound field reactivity and sound image localization or the frequency characteristics.
For a mid-range, we developed a speaker system with its directivity controlled by a sound source with a rectangular shape, thereby realizing a well-diffused sound field even in a restricted narrow cavity providing us with the tendency of an expanding sound image. For comparison with the conventional speaker system, data including the accumulative power characteristics and binaural correlation characteristics of this speaker system are presented in this paper.
For a tweeter, we developed a system which combines a directivity controlled multi-horn speaker and a digital filter, thus realizing an improved asymmetric sound field and definite sound image localization. For this development, we analyzed the sound field inside a vehicle cabin using the acoustic ray tracing method, and the wave front in the horns by the finite element method.
With the above systems, a car audio system has been realized which permits definite sound image localization just in front of a listener, and stereophonic balanced sound reproduction for both the driver's and passenger's seats, for all frequency ranges.
CitationDate, T., Nakama, Y., Saiki, S., and Honda, K., "Built-In Speaker Car Sound System," SAE Technical Paper 920076, 1992, https://doi.org/10.4271/920076.
- Tichy J. Mann J.A. “Use of the complex intensity for sound radiation and sound field studies,” Proc. 2nd International Congress on Acoustic Intensity 113 120 1985
- Kimura Y. Ogawa M. Terai K. Nakama Y. Hanakawa E. “Audio-Visual PANA CAPSULE,” 1988 SAE Technical Paper 880239
- Date T. Honda K. Saiki S. Nakama Y. “Studies of directivity control inside a vehicle cabin,” JAPAN Acoust. Soc. Congress 1991 May
- Matsuda A. Shinada A. Morise K. “Break Through Car Audio with DSP,” 1991 SAE Technical Paper 910792