Investigations on distance coding in 3D sound fields

Abstract

This investigation proposes a possibility to synthesise a true 3D sound field over loudspeakers. A new approach concerning the distance coding is presented. We tried to combine the benefits of using both the wave field synthesis (WFS) approach and higher order ambisonics (HOA). Therefore the proposed system can be divided into two main parts. Firstly the determination of the driving functions of the sound sources using a derivative of the WFS approach. Secondly the coding for transmission and/or storage whereby the scheme is based on the ambisonics approach using higher orders. The paper is organised in four sections. The first section gives a brief introduction about the WFS and the HOA approaches. In the second section the derivation of the driving functions is presented and the coding scheme of the derived source signals is explained. Results are given irk section three. Finally the paper is concluded and further possible research directions are identified.