title: Analytical approach to transforming filter design for sound field recording and reproduction using circular arrays with a spherical baffle.
abstract: A sound field recording and reproduction method using circular arrays of microphones and loudspeakers with a spherical baffle is proposed. The spherical baffle is an acoustically rigid object on which the microphone array is mounted. The driving signals of the loudspeakers must be obtained from the signals received by the microphones. A transform filter for this signal conversion is analytically derived, which is referred to as the wave field reconstruction filter. The proposed method using a spherical baffle is compared with methods using an array of directional microphones and a microphone array mounted on a cylindrical baffle. Numerical simulations indicated that the proposed method is advantageous for sound field recording and reproduction compared with the other two methods. The results of measurement experiments in a real environment are also demonstrated.
authors.affiliation: Graduate School of Information Science and Technology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Shoichi
authors.initials: S
authors.lastname: Koyama
authors.affiliation: Faculty of Engineering, Oita University, Oita-shi, Oita 870-1192, Japan.
authors.forename: Ken'ichi
authors.initials: K
authors.lastname: Furuya
authors.affiliation: NTT Media Intelligence Laboratories, Nippon Telegraph and Telephone Corporation, Musashino-shi, Tokyo 180-8585, Japan.
authors.forename: Keigo
authors.initials: K
authors.lastname: Wakayama
authors.affiliation: NTT Media Intelligence Laboratories, Nippon Telegraph and Telephone Corporation, Musashino-shi, Tokyo 180-8585, Japan.
authors.forename: Suehiro
authors.initials: S
authors.lastname: Shimauchi
authors.affiliation: Graduate School of Information Science and Technology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Saruwatari