L-Acoustics dV-DOSC Operator's Manual
Also see for dV-DOSC: Operator's manual
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Contents
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dV-DOSC dV-SUB Manual V2.0 Nov 2001 9Figure 1: Wavefield interference for a conventional sound reinforcement systemcompared to a sculptured dV-DOSC wavefieldWavefront Sculpture PrinciplesAs early as 1988, a preliminary system named "Incremental" had proven the feasibility of V-DOSCand dV-DOSC. From this experimental concept, theoretical research was undertaken by ProfessorMarcel Urban and Dr. Christian Heil. The results of this research were presented at the 92nd AESconvention in Vienna, March 1992 (preprint n°3269).The theory that was developed defines the acoustic coupling conditions required for effectivelyarraying individual sound sources. Relevant parameters include: wavelength, the shape of eachsource, the surface area of each source and the relative source separation.In brief, the coupling conditions can be summarized as follows:An assembly of individual sound sources arrayed with regular separation between the sources on a plane orcurved continuous surface is equivalent to a single sound source having the same dimensions as the totalassembly if one of the two following conditions is fulfilled:1) Shape: The wavefronts generated by the individual sources are planar and the combined surface area ofthe sources fills at least 80% of the total target surface area.2) Frequency: The step or source separation, defined as the distance between the acoustic centers of theindividual sources, is smaller than half the wavelength over the bandwidth of operation.These two criteria form the basis of Wavefront Sculpture Technology™ (referred to as WSTthroughout this text). For further information, more detailed theory is presented in Appendix 3.Additional WST Criteria were developed for the AES preprint entitled ''Wavefront SculptureTechnology'' that was prepared for the 111th Convention, NYC, Sept 2001 (preprint n°5488). Thefirst two WST Criteria were re-derived based on an intuitive approach using Fresnel analysis and inaddition it was shown that:3) The deviation from a flat wavefront must be less thanλ/4 at the highest operating frequency (thiscorresponds to less than 5 mm curvature at 16 kHz) |
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