Auralization of Sound Fields in Auditoria Using Wave Field Synthesis.

摘要

In this thesis a new method of sound reproduction in an enclosure is described, based on the theory of wave field synthesis (WFS): auralization. WFS is a technique based on Huygens's principle of wave field propagation and was introduced for application in acoustics in (Berkhout, 1987). The synthesis in a reproduction room, of a wave field recorded elsewhere with preservation of its acoustical properties is called auralization. By measuring the impulse responses of a hall with closely spaced microphone arrays, the spatial and temporal structure of the sound field in that hall can be determined. Pressure and velocity microphones reveal directivity information allowing the simulation of a detector with a cardioid directivity characteristic to discriminate between signals coming from different directions. These microphone signals can then be extrapolated to loudspeaker arrays at all sides. Thus, when the loudspeakers are driven with these extrapolated signals, the acoustics of (a part of) the original hall will spatially and temporally correctly be recreated within the reproduction area.