Ears of the robot: Noise reduction using four-line ultra-micro omni-directional microphones mounted on a robot head. - Tetsuji Ogawa; Hirofumi Takeuchi; Shintaro Takada; Kenzo Akagiri; Tetsunori Kobayashi (EUSIPCO, 2008)

Speech enhancement using square microphone array for mobile devices. - Shintaro Takada; Tetsuji Ogawa; Kenzo Akagiri; Tetsunori Kobayashi (ICASSP, 2008)

Direction-of-arrival estimation under noisy condition using four-line omni-directional microphones mounted on a robot head. - Tetsuji Ogawa; Kosuke Hosoya; Kenzo Akagiri; Tetsunori Kobayashi (EUSIPCO, 2009)

Development of zonal beamformer and its application to robot audition. - Nobuaki Tanaka; Tetsuji Ogawa; Kenzo Akagiri; Tetsunori Kobayashi (EUSIPCO, 2010)

Speech Enhancement Using a Square Microphone Array in the Presence of Directional and Diffuse Noise. - Tetsuji Ogawa; Shintaro Takada; Kenzo Akagiri; Tetsunori Kobayashi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)