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室内声场的扩散程度是影响房间音质的重要因素。本文讨论实现声扩散的各种结构的声学特性,并就此进行模型试验。文中着重比较了M.R.Schroeder提出的QR序列(二次剩余序列)扩散板与常用的规则形扩散体的散射性能。试验结果表明,QR扩散板明显优于规则形的扩散体。首先,QR扩散板的散射图案十分均匀;其次,它的作用频带较宽;再者,它对于任意方向的入射声都有较好的散射作用。此外,它可以产生反射声序列。因此,这种扩散板对于录音室、音乐厅等建筑的声学设计具有良好的应用价值。
The degree of diffusion of the indoor sound field is an important factor affecting the sound quality of the room. This article discusses the acoustic properties of various structures that realize sound diffusion and conducts model tests on this. In this paper, the scattering performance of the QR-sequence (quadrature residue sequence) diffuser and the commonly used regular diffuser proposed by M.R. Schroeder is emphatically compared. The test results show that the QR diffuser is significantly better than the regular diffuser. First, the diffuse pattern of the QR diffuser is quite uniform; second, it has a wider band of action; moreover, it has a good scattering effect on incident sound in any direction. In addition, it can produce reflected sound sequences. Therefore, this kind of diffuser plate has good application value for acoustic design of recording studios, concert halls and other buildings.