Influence of the shape and size of a dummyhead upon thevenin acoustic impedance and Thevenin pressure

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概要

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• The influence of shape and size of a dummyhead upon the sound reaching the ear is discussed. The Thevenin acoustic impedance and Thevenin pressure, which have been adopted as acoustical parameters for evaluating the effect of individually different shapes and size of the human head (K. Fukudome, Proc. 10 th Int. Congr. Acoust. (Sydney)1980), are numerically examined by using two types of model heads. The shape and size of the model heads, respectively a sphere and an oblate spheroid, were changed according to head circumference and the cephalic index of the somatometry of the head. As a result, it was found that the Thevenin acoustic impedance is hardly influenced by the shape and size of the model head. The influence of head shape and size upon the maximum of absolute value of log magnitude and phase of Thevenin pressure was illustrated in terms of an equal magnitude contour and an equal phase contour. A final discussion deals with regards for an average head in shape and size as a head which is acoustically standard.

• 社団法人日本音響学会の論文

著者

• YAMADA Masaki

  Department of Applied Chemistry. Faculty of Engineering, Toyama University

• Yamada M

  Osaka Univ. Arts Osaka Jpn

• Fukudome Kimitoshi

  Department of Acooustic Design,Kyushu Institute of Design

• Fukudome K

  Kyushu Inst. Design Fukuoka‐shi Jpn

• Yamada Masaki

  Department of Acooustic Design,Kyushu Institute of Design

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