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Description
Noise from building service equipment is often neither ideally stationary nor ideally impulsive, but exhibits a complex temporal structure. Requirements for sound insulation against noise from building service equipment in Germany are given in terms of LAF,max,n. This raises the question of how such noise should be treated in the prediction method according to EN 12354-5 and EN 15657, which is presently formulated for stationary excitation. While levels of stationary sounds are commonly normalized using the equivalent absorption area of the receiving room, EN ISO 10140-3 provides an alternative correction for ideal impulsive excitation based on receiving room volume and reverberation time. Building on previous work, this paper investigates how EN 12354-5 and EN 15657 can be extended towards transient excitation. A universal room-correction method is proposed that accounts for both room properties and signal transience. Validation measurements in a building-like test stand and in a reverberation chamber with varied reverberation times show that the proposed universal (transience-adaptive) correction reduces the influence of the room condition and improves the agreement between measured and predicted maximum sound pressure levels for transient signals.