Svantek SV 973, Руководство пользователя

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SVAN 973 User Manual
– Appendixes
210
Fig 4. The RT 30 evaluation
E.3. D
ESCRIPTION OF THE DECAY CURVE RECORDING IN DIFFERENT MEASUREMENT METHODS
➢
DECAY method
This RT 60 measurement method requires omnidirectional sound source which emits pink noise in
appropriate frequency band. The most critical parameter of the omnidirectional sound source is emitted sound
pressure level as it was mentioned in the beginning of the appendix.
The graphical illustration of the data recording in this method is presented in Figure 5.
Fig 5. Data recording in the decay method of the reverberation time evaluation
t [s]
L
[dB]
t
4
t
1
L
1
L
4
5 dB
noise
margin
linear approximation
t
2
t
3
30 dB
t [s]
L
[dB]
t
e
t
s
L
2
t
trig
10 dB
L
1
registration time
t
off
t
on
L
2
L
3