Higher order Ambisonics (HOA) is a spatial audio reproduction technique aiming at physically synthesizing a desired sound field. It is based on the expansion of sound fields into orthogonal basis functions (spatial harmonics). In this paper we present an approach to the two-dimensional reproduction of virtual sound sources at arbitrary positions having arbitrary radiation directivities. The approach is based on the description of the directional properties of a source by a set of circular harmonics. Consequences of truncation of the circular harmonics expansion and spatial sampling as occurring in typical installations of HOA systems due to the employment of a finite number of loudspeakers are discussed. We illustrate our findings with simulated reproduction results.

Authors: Ahrens, Jens; Spors, Sascha
Affiliation: Technical University of Berlin
AES Convention: 123 (October 2007) Paper Number: 7243
Publication Date: October 1, 2007 Import into BibTeX
Subject: Acoustic Modeling
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=14301

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