Reverberation time

Task: Find the reverberation time and provide start and stop level criteria. For example, standard T20 or T30, manual fit, etc.

How to do this in WinMLS:

From Setups->Load..., load the setup named Room Acoustics_Reverberation Time.

From File->Open..., select the file AnalysisTestSig.wav that you have downloaded from the link above or the file you wish to analyze. Then the reverberation time will be displayed in the upper plot and the impulse response will be plotted on a dB axis in the lower plot.

Go to Room Acoustics->Reverb Times (RT-60)..., if the calculation options dialog is displayed, then select the settings as shown below (change from Third

Click  to exit the dialog box.Then the result should look like shown below where we also can see the time window lower limit which is set automatically as default (the start may also be specified manually if that is desired as described in the FAQ section).

Click the  button to copy the results to clipboard as shown below:

C:\WinMLSmeasurements\AnalysisTestSig.wav

F(Hz)    63      125    250    500    1000   2000   4000   8000

snr(dB)          14.4    23.1    27.7    33.9    36.3    33.7    26.5    16.6

edr(dB)          20.6    33.9    38.9    46.3    48.0    45.7    39.1    29.9

EDT(s)           3.05    2.18    1.69    1.24    1.12    1.10    1.07    0.77

T30(s)            3.03    1.76    1.63    1.22    1.18    1.16    1.12    0.91

corr    -0.997            -0.998            -0.997            -0.999            -1.000            -1.000            -1.000            -1.000

T20(s)            3.03    1.81    1.49    1.15    1.20    1.15    1.11    0.92

corr    -0.997            -0.996            -0.996            -0.999            -0.999            -1.000            -0.999            -1.000

r(m)   228.2                                                                         

We have now found reverberation times T20 and T30.