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58
T
30
63 Hz 0.48 s to 11.4 s
125 Hz 0.24 s to 11.4 s
250 Hz 0.12 s to 11.4 s
500 Hz 0.12 s to 11.4 s
1 kHz 0.12 s to 11.4 s
2 kHz 0.12 s to 11.4 s
4 kHz 0.12 s to 11.4 s
7.5.2 Estimation of the slope of the decay curve
The estimation of the slope of the decay curve is automatically achieved from the lineal
regression by least square approximation of itself.
7.5.3 Standards of measurement and calculation
You can make measurements and calculations according the next standards:
Standards of measurement and calculation
ISO 3382-1 Measurements of the reverberation time in performance spaces
ISO 3382-2 Measurements of the reverberation time in ordinary rooms
ISO 354 Measurement of sound absorption in a reverberation room
ISO 140 Measurement of sound insulation in buildings and of building elements
7.6 Function summary table
7.6.1 Reverberation time mode functions
Function Freq.
Weigh.
63 125 250 500 1 k 2 k 4 k
Reverberation TimeT
30
X X X X X X X
Reverberation Time T
20
X X X X X X X
Sound pressure level of the
background noise
- X X X X X X X
Initial maximum sound
pressure level
- X X X X X X X
Time history of the decay curve - X X X X X X X
X:
available
- :
without freq. weighing
All the functions are measured simultaneously