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Entries found for search: reverberation

reverberation time : The time of reverberation is defined as the time it takes for the SPL to decay to one-millionth of its former value, a 60dB reduction, hence called the RT-60 of the space. Also called decay time.

reverberation : The decaying residual signal that remains after a sound occurs, created by multiple reflections as the original sound wave bounces off walls, furniture, and other non absorptive barriers within a room or other acoustical environment. Reverberation contains the same frequency components as the sound being processed, but no discrete echoes. An average club has a natural reverberation time of about a half-second; many concert halls and auditoriums have a natural reverberation time of two seconds or more. A room with very little reverberation is called a dead room, which is the opposite of a live acoustic space which is very reflective. Reverberation is composed of early reflections and later reflections.

High-frequency sound waves have to cause the surrounding air molecules to vibrate quickly enough to pass the sound energy onwards, consequently high-frequency reflections die out faster than mid-frequency or bass reflections. Also, high-frequency sound is more readily absorbed by soft furnishings. Low-frequency sounds are only reflected by large and heavy objects, so there may be very little low-frequency reverberant sound. However, in larger rooms, there can be substantial bass build-up.


reverse reverberation : A digitally simulated effect whereby a sound envelope is created by the usual attack, release, and sustain stages, but the decay portion of the envelope is purposely reversed so that the reverberant sound increases in amplitude, rather than naturally decreasing.

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