SOME CONSIDERATIONS CONCERNING REPLICATED SPECTRA

The aim of this paper is to clarify the effect replicated sources in t wo-dimensional radiation problems. In fact, it will be shown that the discrete pressure computed by using the angular spectrum approach is e qual to the analytical pressure plus error terms arising from the conv olutions of replicated spectra of the original spectrum and the Green' s function. A similar result is obtained for the far-field discrete pr essure. For the later case, it will be shown that errors can be elimin ated by choosing a sampling step smaller to that given by the Nyquist criterion. (C) 1998 Acoustical Society of America.