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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)
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Read more :http://en.wikipedia.org/wiki/Echo_(phenomenon)
HEY HEY HEY IS IS IS THERE THERE THERE AN AN AN ECHO ECHO ECHO IN IN IN HERE HERE HERE ???