IMPLEMENTATION OF DIRECTIONAL SOURCES INWAVE FIELD SYNTHESIS

Wave field synthesis (WFS) is a spatial audio reproduction tech-nique aiming at physically synthesizing a desired sound field. Typ-ically, virtual sound sources are rendered as emitting spherical or plane waves. In this paper we present an approach to the imple-mentation of sources with arbitrary directivity. The approach is based on the description of the directional properties of a source by a set of circular harmonics. A time domain expression of the loudspeaker driving signals is derived allowing an efficient imple-mentation. Consequences of sampling and truncation of the sec-ondary source distribution as occurring in typical installations of WFS systems are discussed and simulated reproduction results are shown. 1