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ADAU1442 - Vrms input measurement

Hi Srs.,

It's my first post here and I’m working with adau1442 dsp to develop a sound level meter with frequency analyzer. I know making a frequency analyzer in sigmastudio, but I don't know how to read the audio input voltage (true RMS) to calculate sound pressure level in db and  A, C and Z frequency weighting filter.

I would like to know if it's possible and how to read true rms audio input voltage.

 

Thanks in advanced.

 

 

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