An evaluation method for sampling spaces in measurements of sound pressure distribution.

Abstract

This paper deals with an evaluation method for sampling spaces in the measurement or the calculation of sound pressure distribution. In this method, a sampling factor is newly defined as the ratio of the uniform sampling space to the half wavelength of the sound measured. On the assumption that the sound pressure distribution is expressed by one-dimensional space coordinates, it can be proved based on the sampling theorem in the time domain that the sampling space should be determined so that the sampling factor becomes smaller than 1. In order to examine the effect of the sampling factor, experiments have been performed using three models of sound sources. The sound pressure distribution around each model has been measured and calculated for different sampling factors. All the results obtained show that the evaluation method using the sampling factor holds well for actual three-dimensional sound fields.