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.
How to computing low frequency sound transfer function from source to receiver in enclosed room has become key problem in small enclosed room auralization.