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Sound Field Reproduction by Wavefront Synthesis Using Directly Aligned Multi Point Control
In this paper, we present a comparative study on directly aligned multi point controlled wavefront synthesis (DMCWS) and wave field synthesis (WFS) for the realization of a high-accuracy sound reproduction system, and the amplitude and phase characteristics of the wavefronts generated by DMCWS and WFS are assessed on the computer simulations and measurement in actual environments. First, the results of computer simulations revealed that the wavefront in DMCWS has wide applicability in both the spatial and frequency domains with small amplitude and phase errors, particularly above the spatial aliasing frequency in WFS. Next, we developed wavefront measurement system and measured a DMCWS wavefront with this system and proposed algorithm. The results of measurements clarified the effect of a reflected wave and the frequency characteristics of a loudspeaker. Also, DMCWS has wide applicability in frequency domains in actual environments. From these findings, we concluded the advantageousness of DMCWS compared with WFS.
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