Sound Pressure inside the cabin

AI Thread Summary
To measure sound pressure inside a cabin accurately, using two microphones is a valid approach. It is not sufficient to simply average the sound pressure levels; a logarithmic weighted average is required for precise results. The formula provided, Lavg = 10 log [ 10^(L1/10) + 10^(L2/10) + ... + 10^(LN/10) ], allows for proper calculation of the average sound level from multiple readings. Referencing "Noise Control" by Colin Hansen can provide further insights into this methodology. Accurate measurement is essential for effective noise control and analysis.
jahlin
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Hello,
I am trying to measure the sound pressure inside a cabin. I placed 2 microphones to measure it using octave band. For each frequency i have two sound pressures ..is it possible to take the average of them ? for example add the 2 sound pressure for the 2 microphones and divide them by 2?
Thanks.
 
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You have to do a logorithmic weighted average. See "Noise Control" by Colin Hansen for details. But I think a simple approach is:

Lavg = 10 log [ 10^(L1/10) + 10^(L2/10) + ... + 10^(LN/10) ]

Where L1, L2, ... LN are your readings at each frequency.
 
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