what is echo? and explain
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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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When the sound wave is reflected back from a surface and you can heard the sound again such situation is known as echo. echo can be heard more than once due to reflection of sound multiple time.There are condition for hearing echo there should be time and distance gap the reflected sound should reach our ear after 0.1 second after the original sound.
Example:- It can be heard in places which are small and have strong wall such has well.
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