Nachhallberechnung nach Sabine - sengpielaudio
reverb time reverbtime reverberation RT60 time room acoustics Sabine sabin sabin formula compute calculate calculating calculation calculations calculator converter convert conversion RT60 table tables audio studio technique techniques wall walls surface ceiling floor acoustics sound pressure absorption equivalent absorption area surface time coefficient coefficients reflection factor factors material critical distance measurement reverb reverberation Sengpiel sengpielaudio Berlin
Deutsche Version UK-flag s/w - sengpielaudio D-flag - sengpielaudio
 
Calculation of the reverb time  RT 60  decay after Sabine

In 1898, Wallace C. Sabine (Sabin) (1868 - 1919) came up with the formula in
"Collected Papers on Acoustics" appeared in print 1922:

RT60 = k · V / A

with k = (24 · ln 10) / c20 = 0.161 (metric)

V = room volume in m3    A = α · S = equivalent absorption surface or area in m2
RT60 = reverberation time in s    S = absorbing surface in m2
A = α1 · S1 + α2 · S2 + α3 · S3 + .. .          c20 = 343 m/s at 20°C

RT60 is the reverberation time, the sound pressure level of a signal needs to decay to the value of (−) 60 dB.

k is a constant that equals 0.161 when the units of measurement are expressed in meters and 0.049 when units are expressed in feet.
A = S × α is the total surface absorption A of a room expressed in sabins. It is the sum of all the surface areas in the room multiplied by their respective absorption coefficients. The absorption coefficients α express the absorption factor of materials at given frequencies.
V is the volume of the enclosure. The figures used in this calculator come from the
table of absorption coefficients for various materials which can be found in any book that talks about room acoustics.

Enter the measurements of the room. Make sure you specify the units.
Width Length Height feet meters
Walls Material Windows, doors and other surfaces
Deflection Material Size How many
Front x
Back x
Left x
Right x
Ceiling x
Floor x

125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz

Estimated RT 60 of this roomis seconds.

            

Absorption Coefficients α of Building Materials and Finishes

back zurück next weiter home Start