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Study On Echo Suppression Effect And Coloration Due To Periodic-type Diffusers

机译：周期性扩散器的回声抑制效果和着色研究

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摘要

An echo is one of the obstacles in halls and theatres. In order to suppress this undesirable echo, walls and ceilings have been often given absorptive surfaces which absorb sound energy or corrugated surfaces which provide wave diffusion. While it is not difficult to predict the degree of echo suppression effects in the case of absorptive surfaces, it is generally difficult to do that in the case of corrugated surfaces. In addition, if the surfaces have periodicity, unintended effects called coloration can distort tonal characteristics of the sound field. Thus, many acoustic designers would hesitate to employ this kind of periodic-type diffusers. However, there are some cases where it is necessary to suppress echoes without any energy loss. Periodic-type diffusers have the advantages of easy estimation of diffusion properties, simple method of design, and ready availability. In this study, a subjective experiment with simulated stimuli was carried out to clarify the echo suppression effect of the periodic-type diffusers from the viewpoint of reflected energy level. Although coloration interfered subjective judgments in some cases of the experiment, it is shown that the periodic-type diffusers have echo suppression effects if the coloration does not occur. This study is also devoted to discussion about causes and features of the coloration.
机译：回声是大厅和剧院中的障碍之一。为了抑制这种不希望的回声，经常给墙壁和天花板提供吸收声能的吸收性表面或提供波扩散的波纹状表面。虽然在吸收性表面的情况下不难预测回声抑制效果的程度，但在波纹状表面的情况下通常很难做到这一点。另外，如果表面具有周期性，则称为着色的意外效果可能会使声场的音调特性失真。因此，许多声学设计师会犹豫采用这种周期性扩散器。但是，在某些情况下，有必要抑制回声而不损失任何能量。周期性扩散器的优点是容易估计扩散特性，简单的设计方法和易于使用的优点。在这项研究中，进行了模拟刺激的主观实验，以从反射能级的角度阐明周期性扩散器的回声抑制效果。尽管在某些情况下，着色会干扰主观判断，但可以证明，如果不发生着色，则周期性扩散器会产生回声抑制效果。该研究还致力于讨论着色的原因和特征。

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