paper - Odeon

5 COMPARISON OF SIMULATED AND MEASURED RESULTS
5.1 Auditorium 21
In Figure 15 measured and simulated values of EDT, T 30 , SPL (the G value with a source
power of 31 dB), T s , C 80 and D 50 are displayed for P1 and five receiver positions at 1000 Hz. In
addition an extra frequency band (125 Hz) is displayed for C 80 .
The agreement between measured and simulated parameters at 1000 Hz is within 0.5 JND for
most parameters which is very satisfactory. The difference between measured and simulated
EDT varies from 0.01 to 0.07 seconds with an average deviation of 0.52 JND. As for T 30 , the
difference between measured and simulated values varies from 0.01 to 0.03 seconds with an
average deviation of 0.16 JND (it should be noted that the model was calibrated to match the
average T 30 ). It is interesting to see that both measured and simulated values of EDT (1.98 and
1.96 seconds) are marginally higher that T 30 (1.89 and 1.91 seconds) so this undesired feature
is detected in simulations as well as in the real room. Values of measured and simulated SPL,
Ts, C 80 and D 50 are all in good agreement - and measured and simulated values agree on the
variation with position. There is not space for graphs displaying the rest of the octave bands
from 125 to 4000 Hz, but except for the 125 and 250 Hz band, which shows deviations above 1
JND, there seems to be a fine agreement here too.
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