2.5D Near-field Reproduction in Higher Order Ambisonics

DOI

10.2991/icwcsn-16.2017.88How to use a DOI?

Keywords

Higher order Ambisonics, 2.5D near-field reproduction, DM-NFC filter, 3D higher order loudspeaker.

Abstract

2.5-dimensional (2.5D) sound field reproduction is a hot topic in acoustic signal processing, which overcomes the dimensionality mismatch (DM) problem between 2-dimensional (2D) sound field synthesis and practical sound sources. Based on the cylindrical/spherical harmonic expansion of Higher Order Ambisonics (HOA), a new method for 2.5D near-field reproduction is proposed in this paper. Firstly, a DM near-field corrected (DM-NFC) filter is proposed for restricting the 2.5D near-field distortion and achieving an efficient implementation. Secondly, we obtain the modified cylindrical harmonic expansion of the desired sound field based on cylindrical harmonic synthesis. Then, a general expression of the loudspeaker driving function is derived by using the concept of continuous loudspeaker array hypothesis. Finally, the proposed method is extended by using a circular array of 3-dimensional (3D) higher order (HO) loudspeakers, which provides a mode matching solution based on 3D wavefield translation. The test results indicate that the 2.5D near-field distortion is evidently eliminated by the proposed method. Furthermore, through using HO loudspeaker array, the proposed can significantly reduce the minimum number of loudspeakers for 2.5D near-field reproduction.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Wen-Bei Wang
AU  - Mao-Shen Jia
AU  - Chang-Chun Bao
PY  - 2016/12
DA  - 2016/12
TI  - 2.5D Near-field Reproduction in Higher Order Ambisonics
BT  - Proceedings of the 3rd International Conference on Wireless Communication and Sensor Networks (WCSN 2016)
PB  - Atlantis Press
SP  - 417
EP  - 422
SN  - 2352-538X
UR  - https://doi.org/10.2991/icwcsn-16.2017.88
DO  - 10.2991/icwcsn-16.2017.88
ID  - Wang2016/12
ER  -