Reverberation by Apocalypse Acoustics

Reverberation is linked to the speed at which sound energy disappears in a room.

An unfurnished room with hard surfaces, such as a church, is perceived as being more reverberant than a well-furnished living room.

  • The reverberation time is usually defined as the time it takes for sound to decrease by 60 dB.
  • To determine the length of this time, different parts of the reverberation curve are used.
  • When measuring Early Decay Time (EDT), an interval of 10 dB is used. At T20, an interval of 20 dB is used.
  • When determining T20, the evaluation does not start until after the sound level has already fallen by 5 dB.
  • At T30, an interval of 30 dB is used and here, too, the evaluation starts after the sound level has fallen by 5 dB.
  • If the reverberation curve is straight, the EDT, T20 , T30, will all produce the same value. In practice, the reverberation curve is not straight (dashed line), which means that the descriptors will differ.
  • The descriptors T20 and T30 are usually called “late reverberation times” as they measure at the later part of the curve.
  • EDT is called “early reverberation” and is considered to better reflect how we perceive the reverberance in the room.

To understand more about Reverberation, mail us at apocalypse@mail.org or call us at+919395333255. Noel Flemming. Copyright 2015. Apocalypse Acoustics Sciences Corp.