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How sweet the answer Echo makes — Echo

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"How sweet the answer Echo makes To music at night, When, roused by lute or horn, she wakes, And far away, oer lawns and lakes, Goes answering light."
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Echo
Echo
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In audio signal processing and acoustics, an 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. Typical examples are the echo produced by the bottom of a well, a building, or the walls of enclosed and empty rooms.