title: Generation of half-space sound fields with application to personal sound systems.
abstract: A method is presented for generating a sound field that is significantly attenuated over half of the reproduction region, which has application to the generation of two independent sound fields for two listeners. The half-space sound field is produced by attenuating the negative or positive modes in the cylindrical or spherical expansion of a plane wave or point source sound field. It is shown that this is equivalent to adding to the original sound field, in quadrature, a second field which is the Hilbert transform of the original field. The resulting analytic field has a small magnitude in one half of the plane. Methods are presented for controlling the attenuation in the unwanted half-space. Finally, a simulation is presented showing the generation of a wideband pulse that propagates across half of the area within a circular array of sources.
authors.affiliation: Callaghan Innovation, P.O. Box 31-310, Lower Hutt, New Zealand.
authors.forename: M A
authors.initials: MA
authors.lastname: Poletti
authors.affiliation: Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, United Kingdom.
authors.forename: F M
authors.initials: FM
authors.lastname: Fazi