NHK has been developing a portable microphone for the simultaneous recording of 22.2ch multichannel audio. The microphone is 45 cm in diameter and has acoustic baffles that partition the sphere into angular segments, in each of which an omnidirectional microphone element is mounted. Owing to the effect of the baffles, each segment works as a narrow angle directivity and a constant beam width in higher frequencies above 6 kHz. The directivity becomes wider as frequency decreases and that it becomes almost omnidirectional below 500 Hz. The authors also developed a signal processing method that improves the directivity below 800 Hz.

Authors: Ono, Kazuho; Nishiguchi, Toshiyuki; Matsui, Kentaro; Hamasaki, Kimio
Affiliations: NHK Engineering System, Inc., Setagaya-ku, Tokyo, Japan; NHK Science & Technology Research Laboratories, Setagaya, Tokyo, Japan(See document for exact affiliation information.)
AES Convention: 135 (October 2013) Paper Number: 8922
Publication Date: October 16, 2013
Subject: Transducers

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