Abstract Ancient architectural shapes as domes and other curved surfaces are widely admired by architects even if they may present serious acoustical hazards. In large interiors formed by curved surfaces, acoustical singularities such as the “sliding” of sound along a concave wall or a concentration of sound in a distant location of the room may happen. These phenomena can be mostly found in historical spaces where these effects were usually detected accidentally creating an atmosphere of mystery. Nowadays, in contemporary auditoriums they are mostly considered an acoustic flaw and they must be corrected or eliminated. A practice in avoiding these miraculous acoustical properties, the focusing and whispering, is not usually applied and other shapes are preferred for new projects. In the paper architectural acoustic design approaches and solutions to maintain ancient shapes for modern architectural and acoustic design are investigated. A geometrical acoustic analysis is presented, followed by the description of different methods for avoiding focusing and whispering applied to a case study. Room Acoustics procedures and implementations of computer simulation techniques are included. A procedure for acoustic design for spaces with circular and elliptical plane or/and sections is suggested where the acoustic response is suitable for multipurpose uses.

中文翻译：

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现代建筑和声学设计的古老形状：由曲面形成的大型室内设计

摘要 古代建筑形状，如圆顶和其他曲面，即使可能存在严重的声学危害，也受到建筑师的广泛赞赏。在由曲面形成的大型内部空间中，可能会发生声学奇点，例如声音沿着凹墙“滑动”或声音集中在房间的远处。这些现象大多出现在历史空间中，这些影响通常是偶然发现的，从而营造出一种神秘的氛围。如今，在当代礼堂中，它们大多被认为是声学缺陷，必须予以纠正或消除。通常不采用避免这些神奇的声学特性（聚焦和耳语）的做法，新项目更喜欢其他形状。在论文中，研究了在现代建筑和声学设计中保持古老形状的建筑声学设计方法和解决方案。介绍了几何声学分析，然后描述了应用于案例研究的不同方法，以避免聚焦和窃窃私语。包括室内声学程序和计算机模拟技术的实现。建议采用圆形和椭圆形平面或/和截面空间的声学设计程序，其中声学响应适合多用途。包括室内声学程序和计算机模拟技术的实现。建议采用圆形和椭圆形平面或/和截面空间的声学设计程序，其中声学响应适合多用途。包括室内声学程序和计算机模拟技术的实现。建议采用圆形和椭圆形平面或/和截面空间的声学设计程序，其中声学响应适合多用途。