occurs in the same way as light reflection. When a sound wave propagates and encounters an obstacle, such as a wall, it strikes the barrier and returns to the medium in which it was propagating. From this event, two others originate, which are called echo and reverberation ..
Any sound can undergo the phenomenon of reflection , but humans can only distinguish the sound emitted from the one that is reflected when the latter returns to the human ear in a time interval equal to or greater than 0.1 second. Also, if the speed of sound in air is 343 m/s, the obstacle from which reflection occurs must be at a distance equal to or greater than 17.15 m. If the reflected sound returns to the source within less than 0.1 second, the phenomenon of reverberation occurs. We can distinguish echo from reverb as follows:
- Echo occurs when the reflected sound returns to the source after the original sound has been completely extinguished.
- Reverberation happens when the reflected sound returns to the source before the original sound has been extinguished, that is, reinforcement of the emitted sound occurs.