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.
This illustration depicts the principle of sediment echo sounding, which uses a narrow beam of high energy and low frequency
what is the only sound in the whole world or even the whole universe that does not echos?
it is the quack of a duck
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