Acoustics - Measurement of sound absorption in a reverberation room

This document establishes the test method for determining the sound absorption properties of materials and objects within a reverberation room environment. It defines the procedures required to calculate the total sound absorption of the test specimen by measuring the difference in the reverberation time of the room with and without the sample present. The standard specifies the technical requirements for the test room, including minimum dimensions and distribution of sound diffusion, as well as the characteristics of the sound source and the measurement microphone array. It outlines the steps for preparing the test sample, positioning it within the room, and conducting the measurements across a specified frequency range. Furthermore, it provides guidance on the calculation of absorption coefficients and the expression of the total absorption value. This method ensures consistent and comparable results for acoustic material characterization, facilitating accurate assessments of sound absorption performance in various applications. The approach relies on established principles of room acoustics and statistical energy analysis to derive reliable data for engineering and research purposes.