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混响时间控制是视听空间设计中不能忽视的重要部分,与房间大小与比例一样会严重影响房间的声音特性优劣。对于一个优秀的家庭视听室,室内混响时间频率曲线必须平坦,不能有明显的起伏,低频部分可以适当增加,高频部分可以适当减少。同时,混响时间的长短要适当,符合国内外主要组织对混响时间的具体要求,大概在0.3～0.6s之间。否则,过短的混响时间会让声音干枯,不够响亮与丰满;而过长的混响时间会让声音含糊不清,不够真实自然。回顾上期的特别策划,已经将混响时间的概念、混响时间的计算方式、最佳混响时间的推荐范围以及国内外组织与机构对于混响时间的推荐标准作了全面的介绍,也简述了对家庭视听室进行混响时间控制的基本手段。作为建筑声学史上首个能够利用数学量化方式对抽象的声音进行预测与控制的参数,混响时间赋予人们更大的空间对声音进行控制。因此,我们需要利用各种吸声与扩散的手段对其进行全方位的控制。本期,我们将接着上期简单涉及的关于家庭视听室混响时间基本控制手段进行深入探究,展开讨论吸声与扩散这两种声学处理手段对于房间混响时间以及整个声场特性的影响,深入探讨各种不同的吸声与扩散声学材料的特性。
Reverberation time control is the audiovisual space design can not be ignored an important part, and the same size and proportion of the room will seriously affect the sound quality of the room. For a good home audio-visual room, the indoor reverberation time frequency curve must be flat, can not have obvious ups and downs, the low-frequency part can be appropriately increased, high-frequency part can be appropriately reduced. At the same time, the length of the reverberation time should be appropriate, in line with the specific requirements of major organizations at home and abroad reverberation time, about between 0.3 ~ 0.6s. Otherwise, too short reverb time will make the sound dry, not loud and full; and long reverberation time makes the sound ambiguous, not real enough. Recalling the special planning of the previous period, the concept of reverberation time, the calculation method of reverberation time, the recommended range of optimal reverberation time and the recommended standards for reverberation time by organizations and institutions at home and abroad have been fully introduced. Describes the basic means of controlling the reverberation time of the home audio-visual room. As the first parameter in the history of architectural acoustics that predicts and controls abstract sounds using mathematical quantification, the reverberation time gives people more space to control sound. Therefore, we need to use all kinds of sound absorption and diffusion means to its full control. In this issue, we will go deep into the basic control methods for reverberation time of home audiovisual rooms, which are briefly covered in the previous issue, and discuss the effects of acoustic and diffusive acoustic treatments on the room reverberation time and the entire sound field. A wide variety of acoustic and diffusive acoustic material properties.