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In audio signal processing and acoustics, an echo (plural echoes) is a reflection of sound, arriving at the listener some time 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. A true echo is a single reflection of the sound source. The time delay is the extra distance divided by the speed of sound. The word echo derives from the Greek.

Read more :http://en.wikipedia.org/wiki/Echo_(phenomenon)

12 years ago. Rating: 5
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What is an echo?

12 years ago. Rating: 3
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It is an audio  reverberation that is beamed back to you after you yell something in the direction of a large, long, flat surface.

12 years ago. Rating: 0
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