In this paper, we propose a beam-forming speaker based on digitally direct driven speaker system (digital-SP); the proposed speaker employs multi-bit delta-sigma modulation in addition to a line speaker array with flat-panel-loudspeakers (FPLS) and a delay circuit.　The proposed speaker can be realized only by D flip-flops and digital-SP. The sound direction can easily be controlled digitally. All processes can be performed digitally without the use of analog components such as power amplifiers, and a small, light, thin, high-quality beam-forming speaker system can be realized. The prototype is constructed using an FPGA, CMOS drivers, and a line FPLS array. The 20dB attenuation for 20 degree direction is measured.

Authors: Iwaide, Mitsuhiro; Yasuda, Akira; Kuniyoshi, Daigo; Yokota, Kazuyuki; Moriyasu, Yugo; Sakuta, Kenji; Nakashima, Fumiaki; Masayuki, Yashiro; Yoshino, Michitaka
Affiliation: Hosei University, Koganei, Tokyo, Japan
AES Convention: 131 (October 2011) Paper Number: 8469
Publication Date: October 19, 2011
Subject: Posters: Transducers

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