文章基本信息

标题：後方の感度を抑圧した狭角度指向性マイクロホンの小型化
本地全文：下载
作者：杉本岳大 ; 岩城正和 ; 小野一穂等
期刊名称：映像情報メディア学会誌
印刷版ISSN：1342-6907
电子版ISSN：1881-6908
出版年度：2012
卷号：66
期号：5
页码：J151-J157
DOI：10.3169/itej.66.J151
出版社：The Institute of Image Information and Television Engineers
摘要：This paper describes a miniaturization of a narrow-angle directional microphone that enables rear sensitivity to be significantly suppressed. The microphone assembly comprises of a line microphone capsule and a second-order pressure gradient directional microphone. This combination successfully reduced the residual rear sensitivity of conventional line microphones. The previously proposed microphone is too long to set in a small space. Therefore, the microphone is miniaturized by using small electret condenser microphone capsules, which are stacked in the small case, and by modifying the line microphone capsule's directivity to hypercardioid. The proposed microphone successfully suppresses rear sensitivity by more than 20 dB compared to the frontal sensitivity in the frequency range from 130 Hz to 2.5 kHz. Furthermore, it can be driven by a normal 48 V phantom power supply. Finally, the microphone was tested in several on-the-spot broadcasts, and it proved to be effective for practical use.
关键词：マイクロホン;音響管;2次音圧傾度;指向特性;小型化