Modffusor™
Optimized Quadratic Root Diffusor
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Absorption Coefficients
Hz |
No Fabric |
With Panel Fabric on Surface |
100 |
0.28 |
0.34 |
125 |
0.22 |
0.31 |
160 |
0.22 |
0.35 |
200 |
0.29 |
0.46 |
250 |
0.29 |
0.51 |
315 |
0.26 |
0.58 |
400 |
0.27 |
0.78 |
500 |
0.33 |
0.94 |
630 |
0.32 |
0.96 |
800 |
0.3 |
0.86 |
1000 |
0.22 |
0.67 |
1250 |
0.19 |
0.58 |
1600 |
0.19 |
0.55 |
2000 |
0.18 |
0.53 |
2500 |
0.18 |
0.53 |
3150 |
0.21 |
0.58 |
4000 |
0.2 |
0.6 |
5000 |
0.19 |
0.58 |
At the moment there are two metrics to measure and characterize scattering surfaces- the diffusion coefficient, d, and the scattering coefficient, s
Publication AES-4id-2001, created by Working Group SC-04-02, chaired by Dr. Peter D'Antonio and vice-chair Dr. Trevor Cox, describes a method to determine the uniform diffusion coefficient. This coefficient, which is bound between zero and one, is derived from the circular autocorrelation of the 1/3-octave angular responses. This method is being incorporated in ISO/TC 43/SC 2/WG 25, ) ISO 17497 as Part II. The diffusion coefficient can be used to evaluate potential diffusing surfaces.
Hz |
Reflector |
QRD |
Modffusor |
100 |
0.691333 |
0.7118 |
0.71825 |
125 |
0.619267 |
0.606783 |
0.612233 |
160 |
0.5361 |
0.504067 |
0.5693 |
200 |
0.46905 |
0.386333 |
0.456667 |
250 |
0.419617 |
0.361 |
0.3849 |
315 |
0.366517 |
0.322467 |
0.443367 |
400 |
0.333633 |
0.34515 |
0.531967 |
500 |
0.2897 |
0.537717 |
0.61645 |
630 |
0.241517 |
0.553217 |
0.819933 |
800 |
0.19425 |
0.485667 |
0.853083 |
1000 |
0.148642 |
0.461667 |
0.692283 |
1250 |
0.1169 |
0.235267 |
0.737667 |
1600 |
0.089637 |
0.437083 |
0.894217 |
2000 |
0.07492 |
0.6212 |
0.7437 |
2500 |
0.067707 |
0.6409 |
0.751333 |
3150 |
0.053837 |
0.4218 |
0.820083 |
4000 |
0.047043 |
0.440933 |
0.71665 |
5000 |
0.044427 |
0.71475 |
0.780917 |
6300 |
0.032893 |
0.64605 |
0.706283 |
8000 |
0.024937 |
0.5719 |
0.6288 |
Publication ISO 17497-1, created by Working Group ISO/TC 43/SC 2/WG 25, chaired by Dr. Jens Rindel, describes a method to evaluate the random incidence scattering coefficient. This is obtained by a comparison of the reverberation times, obtained from phase-locked average integrated impulse responses, for a stationary and rotating sample in a reverberation chamber.
| Hz |
Modffusor |
| 100 |
0.09 |
| 125 |
0.14 |
| 160 |
0.18 |
| 200 |
0.25 |
| 250 |
0.36 |
| 315 |
0.48 |
| 400 |
0.55 |
| 500 |
0.68 |
| 630 |
0.82 |
| 800 |
0.89 |
| 1000 |
0.83 |
| 1250 |
0.87 |
| 1600 |
0.93 |
| 2000 |
0.94 |
| 2500 |
0.93 |
| 3150 |
0.9 |
| 4000 |
0.91 |
| 5000 | 0.94 |