Reverberation is defined as the persistence of sound after the sound has been produced. It is caused when the sound signal is reflected causing a large number of reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space. This is noticed mostly when the source of the sound stops but the reflections still continue.

Reverberation is a frequency dependent phenomenon. Unlike echoes, reverberations are the occurrence of reflections that arrive in a sequence of less than approximately 50 ms. But as time passes the amplitude decreases and reaches zero amplitude. Reverberation naturally occurs all the time, even when someone is singing or even talking. During live sound systems reverberations is electronically added to the vocals or to the musical instruments. These effects of Reverberations are often called as reverbs.

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