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Modeling of Leaky Acoustic Tube for Narrow-Angle Directional Microphone

Line microphones have been popular as narrow directional microphones for a long time. Their structure adopts a leaky acoustical tube with many slits to suppress off-axis sensitivity, together with a directional capsule attached to this tube. Although many microphones of this type are on the market, we have no quantitative theory to explain its behavior, which is very important for effectively designing directivity. We thus modeled the leaky acoustical tube using a distributed equivalent circuit and combined it with the directional capsule’s equivalent circuit model. The analysis showed that the model agreed well with the measurement results, particularly at the directional characteristics, while an ordinary model of acoustical tube using delay and sum modeling did not.

Authors: Ando, Akio; Chiba, Yutaka; Hamasaki, Kimio; Imanaga, Keishi; Ishii, Takeshi; Ono, Kazuho; Sugimoto, Takehiro
Affiliations: NHK Science and Technology Research Laboratories, Kinuta Setagaya-ku, Tokyo, Japan; Sanken Microphone Co. Ltd., Suginami-ku, Tokyo, Japan(See document for exact affiliation information.)
AES Convention:129 (November 2010) Paper Number:8216 Import into BibTeX
Subject:Acoustical and Physical Modeling

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