Question

what is echo concept​

Answer 1

hello mate. ....

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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, 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.

Answer 2

Acoustic waves are reflected by walls or other hard surfaces, such as mountains and privacy fences.This can be heard when the reflection returns with sufficient distance between the sound source and the reflector and delay to be perceived distinctly. When sound, or the echo itself, is reflected multiple times from multiple surfaces, the echo is characterized as a reverberation.