An evaluation of scattered reflections in sound fields

Abstract

Although a large number of studies have been made on a theory of scattering, no studies have been attempted to evaluate the scattered sound fields in a concert hall. This paper will show an evaluation method of sound fields that involve scattered reflection by a circular-columns array installed in front of both side walls. Measurements were performed by use of a 1/10 scale model of the concert hall. Here, scattered sound fields are evaluated by four acoustic factors (SPL, DT1, Tsub; IACC, and in addition WIACC and tauIACC). It is found that the IACC and Dt1 of the sound fields of the concert hall are improved with use of the circular columns array.

A Diagnostic System Measuring Orthogonal Factors of Sound Fields in a Scale Model of Auditorium

“…It has been shown that measurements in the scale model for acoustic parameters by the diagnostic system may prove the e!ects of the re#ectors' array and other scattering elements [10] which may not be available by calculation at the 236 design stage. In order to examine the sound "elds after the construction of the auditorium, the diagnostic system measuring orthogonal factors may be applied.…”