what is echo?
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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. ... Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room.
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An echo is a repetition or imitation of sound. When sound waves hit a hard surface they might reflect, making the sound bounce and repeat. If you agree with someone, you might echo his or her statement.
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