[Solved] Convert PCM values from microphone to Sound pressure


I need to convert the PCM values to sound pressure in Pa. Could you please help me with the formula for this conversion?



You would need to calibrate the mic’s first to know the signal level for a defined pressure level, from memory most calibrators provide a 94dB reference signal at 1kHz, but they’re not cheap! Then you can compare measured signal levels against the reference level and determine the decibel difference with the standard formula 20*log10(measured/reference).