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2.1 Terminology
2.1.1 Decay Curve
Decay Curve
After the indoor sound field reaches a steady state、 the sound source interrupts the sound and the sound pressure level at a certain point in the room changes with time. The curve can be measured using the interrupted sound source method or pulse response integration method
2.1.2 Reverberation time
inversion time
The time required for the indoor sound to reach steady state and stop the sound source、 and the average sound energy density to decay from the original value to one millionth (60dB)、 in seconds.
. The reverberation time of sound pressure level decay at 60dB3 can be obtained by linear extrapolation from the range of (-5-25) dB or (-5-35) dB values during the decay process、 denoted as Tw and T2.1.3 Interrupted noise method
The method of directly recording the decay meter of the sound pressure level to obtain the decay curve after the narrowband noise or pink noise source in the excitation room interrupts sound generation.
2.1.4 Pulse response
The instantaneous state of sound pressure formed by the Dirac function pulse sound emitted from a certain point in the room at another point
2.1.5 Integrated pulse response method
The decay curve is obtained by integrating the square of the pulse response in reverse over time.
2.1.6 Vacant unoccupied state
Room situation where the speaker、 actor、 and audience are not present.
2.1.7 Rehearsal Studio State
There is no audience in the language or music room、 only actors、 speakers、 and a small number of observers
The practice performance is conducted for a formal performance.
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