write short defination on "Echo"
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1a : the repetition of a sound caused by reflection of sound waves. b : the sound due to such reflection. 2a : a repetition or imitation of another : reflection.
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In audio signal processing and acoustics, echo is a reflection of sound that arrives at the listener with a delay after the direct sound. ... The delay is directly proportional to the distance of the reflecting surface from the source and the listener.
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