About NISHI TAKASHI
About NHK 放送技研
About MIKAMI JUN'ICHI
About NHK 放送技研
About INOUE TOMOYUKI
About NHK 放送技研
About FURUKAWA SEN'ICHI
About NHK 放送技研
About SHIMIZU YASUSHI
About ヤマハ
About KAWAKAMI FUKUSHI
About ヤマハ
About 電子情報通信学会技術研究報告
About microphone
About Acoustic transducer and other acoustic equipments
About 多方向
About 収音