I'm making simple sound level meter. I try to make it precise. I'm using ADC ref voltage (2,048) so rms calculation can be simpler.
Can I use this ref voltage to set offset voltage to (Vref/2) and measure this signal by diffrential measurement so it eliminate DC offset form readings?
I must use battery supply and 3V3 is from voltage regulator. Entire module is supply by 3,3 volts including ATxmega microcontroller. I'm using electret condenser microphone. I'dont want to use dual polarity supply if this is not necessary.