Measurement of 3D sound field formed by orthogonal three lines speaker array

Abstract

This paper describes actual measurement of 3 0 soundfield which is formed by multiple lines speaker array. 61 order to realize a novel hanabflee sound inter$ace for human-mochine systems, the authors are studying multiple lines speaker array. A technique to transmit sound towards a specified direction by speaker array of one straight line is known as beam forming. The authors propose an idea that two and three orthogonal lines speaker array can form spot-like small area of higher sound pressure level. We conduct simulation of two and three lines speaker array. Simulation results support feasibiliiy of the proposed idea. Based upon the results, the authors construct 32 by 2 lines array and 32 by 3 lines array. And we actually measure 3 0 distribufion of soundpressure level by the constructed speaker arrays. Results of the measurement also support the feasibility of our idea.

Simultaneous generation of multiple three-dimensional sound spot by using 512 ch panel loudspeaker array

“…Delay and Sum Beam Forming (DSBF) method is used to generate local high sound pressure distribution [4]. Fig.3 is theory of DSBF.…”

“…We developed the 120 ch panel loudspeaker array at the one time [3]. However the 120 ch panel loudspeaker array was able to only a straight sound spot.…”

Implementation of luggable linear speaker array system and formation of Sound Spot

“…Fig.1 shows the orthogonality three lines loudspeaker arrays system. For example, the orthogonality three lines loudspeaker arrays can form a sound spot like a ball [3]. The 128 simultaneous output D/A board is used in order to control the loudspeaker arrays.…”

Simultaneous generation of various shaped Sound Spots with multiple linear speaker arrays

“…The loudspeaker arrays system forms a spot-like small area of high sound pressure level (hereafter called Sound Spot) only at a specific position such as person's heads. The shape of the Sound Spot with two orthogonal axis loudspeaker arrays (64 channel) [2] and the shape of the Sound Spot with three orthogonal axis (96 channel) [3][4] [5] loudspeaker arrays are different respectively. Then, the purpose of this paper is the simultaneous generation of the two or more shape Sound Spot.…”