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Here and here are two interesting posts about converting an audio signal recorded from a microphone to SPL.

For specific case of pulse recording, with 0.5ms pulse duration with 1s period between pulses, I want to know associated SPL. I can apply same signal processing :

  1. Apply the window to your signal
  2. Calculate the DFT of your signal
  3. Scale the DFT properly (half of spectra and coherent gain)
  4. Convert the result to decibel scale with a reference acoustic pressure of 2⋅10−5Pa

For step 1, from this article for signals > 50ms it is quite easy to find a valid window which will resolve low frequencies. But when we are interested by the 0.5ms pulse SPL, which are the signal processing step to apply to have a meaningful SPL value?

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