noiseLAB uses Recordings of waveforms as the basis for all measurements.
A Recording may be edited to create one or more Clips that select relevant sections of the Recording. Editing can exclude undesired signals, such as dogs barking, birds chirping, people talking, and overloaded signals. The Clips created thus are more representative of the desired signal, giving more representative results.
But this is “cheating”, you may say, because the operator can decide which signals to include and exclude. However, the opposite is true. The person making a measurement is always responsible for making it under relevant, well-documented conditions, which implies selecting, or editing the relevant signals.
With a classic sound level meter, the measurement is started and stopped and a the result is read. But since the original waveform rarely is saved, there is no way to document what signals actually were measured.
With noiseLAB, the original waveform is always saved, and hence edits can always be audited by listening to or viewing the waveform that was edited. This means that you are not “cheating” by editing, but creating a more transparent, verifiable measurement.
In the following example, the two Clips clearly select the “on” cycle of the machine.
Editing is non-destructive, so you can always go back and modify the Clip duration, or make new analysis of the original waveforms.