Hi I have a microphone(with preamp) connected to a microcontroller - I am able
to get samples now, which could be converted to pressure since I have the
sensitivity of the microphone. I want to get the sound pressure level.
According to "Engineering Acoustics" and "Engineering Noise Control"(Bies and
Hansen), which was referenced by Wikipedia as well
http://en.wikipedia.org/wiki/Sound_pressure
To do this
20 log (pRMS/pRef)
To quote:
where pRef is the reference sound pressure and pRMS is the rms sound pressure
being measured.
Does "pRMS" mean that I don't use the "samples-turned-into-pressure" values
directly? That I have to get a sequence of the values(discrete time system), get
the RMS of that sequence and then use it as an input to the above formula? If
so, then how many "samples" should I get in each RMS computation?
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