Is this the time-averaged SPL of the filtered time signal for each band?
Yes. You must also consider that 3745 allow to measure acoustic power measuring with moving microphones describing circles along the measurement surface. You get the averaged sound pressure after finishing the movement. For fixed microphones you must get the time averaged SPL for each microphone
Thank you Manuel. It seems to me that acoustic measurement is something complicated specially because one has to take care both of "space", "time" and "frequency" at the same time.
If your question is related to chapter 9.4.1 of the ISO 3745:2012, then you are right with your assumption. First you have to apply a third-octave-band filtering to the time signals and then calculate the time-averaged SPL. Please note that the interval limits are dependent on the operation cycles of the sound source and the observed frequency band. See formula (2) of the standard at chapter 3.
Thanks André. When I started reading the standard it was not clear to me the meaning of time-averaged SPL even supposing what it is. The answers here gave me more confidence about that.
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