金属製球殻を用いた音場測定用音源とその近接放射音場について

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タイトル別名
  • Sound Sources with Spherical Rigid Baffles for Free Field Measurements, and Their Near-Field Diffraction
  • キンゾクセイ キュウカラ オ モチイタ オンバ ソクテイヨウ オンゲン ト ソノ キンセツ ホウシャ オンバ ニ ツイテ

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抄録

As a standard sound source for free field measurements of electro-acoustic transducers, spherical sound sources are proposed. Constructions and characteristics of these sound sources are shown, and the diffraction of sound wave due to various baffles are investigated. They are of electrodynamic type with metallic convex diaphragm and spherical rigid baffle. First, two types of spherical sound sources are described. The displacement-frequency characteristics of their mechanical vibrating systems were found to be fairly mass-controlled. The free field response is axi-symmetrical, and calculated on the assumption that its acoustic behavior is same as that of spherical sound source in which only a circular part of spherical surface vibrates uniformly in the direction perpendicular to the centre surface of the circular part. Both measured and calculated free field response are demonstrated, and it was shown that an agreement between two values is fairly good. In the second part, instead of standard sources, condenser microphones MR-103 were used as sound source, and the effect of baffles of various shapes on the sound field were examined experimentally. From the results of the experiments, it was shown the shape of baffle near the diaphragm affects sound field considerably even at a distance, and it was concluded that, for designing standard sound sources, the diffraction by baffle shapes must be taken into account as well as diaphragm characteristics.

収録刊行物

  • 日本音響学会誌

    日本音響学会誌 19 (3), 115-125, 1963

    一般社団法人 日本音響学会

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