how to compute the RMS dB(A) value from an acoustic signal in a spectrum ?

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i have processed the .wav file and plotted the db(a) vs freqyncy data. But the RMS value using the in-built function of matlab returns a different value compared to Siemens Test center that i used to proess the audio file.
i Believe there is a difference between the rms formulas used in both the cases.
can anybody help me ?

Answers (1)

Jimmy Lapierre
Jimmy Lapierre on 26 Aug 2022
It might just be a matter of scaling. For example, if there is a microphone involved, you may need to calibrate for that if the other software is.

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