Reverberation is the persistence of sound in a room after the source has stopped making sound.

回声现象就是在房间中，声源停止发声后，声音仍然持续的现象。

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To verify the accuracy and reliability of the system, contrast tests on reference sound power source and small motor are performed respectively in a semianechoic chamber and a common room.

为了验证噪声检测系统的精度和可靠性，在半消声室和普通房间内，分别对标准声功率源和小型电机作声功率对比测量试验。

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The sound source is placed in a reverberation room, and the receiving room is a small anechoic box.

这种方法，声源放在一个混响室内，而接收室是一个小的消声箱。

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