Sunday 9 June 2019

microcontroller - Convert Digital and Analog values to dB SPL


I am trying to create a sound level meter. I want to use an analog MEMS microphone (INMP510) and a digital microphone with I2S output (SPH0645LM4H). The sensitivity of the INMP510 is -38 dBV and for SPH0645LM4H is -26 dBFS. I am using a PIC32MZ2048EFG100. The ADC module has 12 bits and the voltage for the ADC are 0 and 3.3 V.


I have read this post (How to convert Volts in dB SPL) but I can't find the specifications of the gain of the analog microphone, so I don't know if I am correctly calculating the dB SPL.


Also for the digital microphone, I have no idea how to convert the digital values to dB SPL.


Can somebody help me with mathematical formulas?



Thank you in advance




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