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how to estimate sound intensity using MEMS Microphone?

Question asked by maliszewski.kajetan on Feb 8, 2015
Latest reply on May 12, 2015 by johnn86
hi,

I've been looking for a way to estimate sound intensity using MEMS microphone for a very long time. I am using STM32F4DISCOVERY board with a MEMS microphone on it (it's MP45DT02). I wrote an application that receives sound using this this microphone, writes it into a buffer and converts it from PDM to PCM using library given by ST. So far it works very similar to a program given by ST - "Audio playback and record". Later I use fast fourier transform to get the signal spectrum.
I need to estimate how the amplitude of the sound will be reflected on the spectrum's bars height. The datasheets are modest or even say nothing about it. How can I solve the problem? 

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