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在室内一角（或声压极大处）装一传声器－放大器－扬声器系统，用简正波抑制的原理降低全室混响声的有源噪声控制系统已证明是有效方法，其作用理论和效果也已明确．但过去只考虑了稳定噪声。噪声完全稳定的比较少，即使是稳定噪声也有起始和终止的时候，噪声的变化要激发有源噪声控制系统的瞬态效应，这对于“系统”的使用可能有不利影响．为了充分发挥“系统”的作用，对它的瞬态特性有确切了解的必要。本文目的就是阐明室内有源噪声控制系统的瞬态特性及其对于室内音质的影响。
An active noise control system with a microphone-amplifier-loudspeaker system installed at a corner of the room (or sound pressure level) and reducing the reverberation of the room with the principle of simplified sine-wave suppression has proven to be an effective method and its theory of effect and its effect have also been clarified . But in the past only stable noise was considered. The noise is less stable at all. Even when stable noise starts and ends, the change in noise stimulates the transient effect of the active noise control system, which may have a detrimental effect on the “system” usage. In order to give full play to the “system” role, it is necessary to have an accurate understanding of its transient behavior. The purpose of this paper is to clarify the transient characteristics of indoor active noise control systems and their impact on the indoor sound quality.