Abstract
Quadratic residue diffuser (QRD) groups are used to form a large diffusion surface and extra sound absorption is introduced. In this paper we discuss how the installation pattern of QRD groups affects the sound absorption. The absorption coefficients of QRD in groups with different shapes and combinations were measured in a reverberation room. Notable variations in absorption were observed when the shapes of QRD groups change, especially at the low frequency range below the design frequency of QRD. Two peaks of absorption are observed. When a certain shape is chosen, the detailed combinations of QRDs cause little change in absorption.
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