AES E-Library

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

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.

Authors: Watanabe, Kyosuke; Yasuda, Akira; Ohtani, Hajime; Suzuki, Ryota; Shinkawa, Naoto; Tsuchiya, Tomohiro; Tsuihiji, Kenzo
Affiliation: Hosei University, Koganei, Tokyo, Japan
AES Convention:127 (October 2009) Paper Number:7950 Import into BibTeX
Subject:Arrays

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 127Papers)   /127/7950.pdf

Start a discussion about this paper!