A Novel Beam-Forming Loudspeaker System Using Digitally Driven Speaker System

Watanabe K, Yasuda A, Ohtani H, Suzuki R, Shinkawa N, Tsuchiya T, Tsuihiji K. A Novel Beam-Forming Loudspeaker System Using Digitally Driven Speaker System. In: AES Convention 127. Audio Engineering Society; 2009. Paper 7950. Available from: https://aes.org/publications/elibrary-page/?id=15144

@inproceedings{Watanabe2009_15144,
  author = {Watanabe, Kyosuke and Yasuda, Akira and Ohtani, Hajime and Suzuki, Ryota and Shinkawa, Naoto and Tsuchiya, Tomohiro and Tsuihiji, Kenzo},
  title = {{A Novel Beam-Forming Loudspeaker System Using Digitally Driven Speaker System}},
  booktitle = {AES Convention 127},
  note = {Paper 7950},
  year = {2009},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=15144}
}

TY  - CPAPER
TI  - A Novel Beam-Forming Loudspeaker System Using Digitally Driven Speaker System
AU  - Watanabe, Kyosuke
AU  - Yasuda, Akira
AU  - Ohtani, Hajime
AU  - Suzuki, Ryota
AU  - Shinkawa, Naoto
AU  - Tsuchiya, Tomohiro
AU  - Tsuihiji, Kenzo
T2  - AES Convention 127
M1  - Paper 7950
PY  - 2009
DA  - 2009/10/06
UR  - https://aes.org/publications/elibrary-page/?id=15144
PB  - Audio Engineering Society
LA  - en
AB  - In this paper, we propose a beam-forming speaker based on digitally direct driven speaker system (digital-SP); the proposed speaker employs multibit delta-sigma modulation in addition to a line speaker array and a delay circuit. The proposed speaker can be realized only by D flip-flops and digital-SP. Delay elements are introduced between the mismatch shaper and sub-loudspeakers, and beam-forming is realized without degradation of the noise shaping performance of the multibit DSMBy using a small amount of additional hardware, we can easily control the sound direction. If a beam-forming speaker can be driven digitally, all processes can be performed digitally without the use of analog components such as power amplifiers, and a small, light, high-quality speaker system can be realized. The prototype is constructed using an FPGA, CMOS drivers, and a line speaker array. The effectiveness has been confirmed by using measurement data. A gain of 8 dB or more is measured relative to the normal digital speaker system. And an attenuation of 14.7dB for 40° direction is measured.
ER  -