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decibel - microphone - st32f4 discorvery board

Question asked by on May 27, 2013
Latest reply on May 31, 2013 by
 I test the microphone[MP45DT02] of stm32f4 discorvery board.  
 I use 1.024Mhz Clock input microphone with i2s signal.
Pmd fiter of  library is applied and get pcm data from pdm data.
Is it corret pcm data that no sound is about 0 or 65535, loud sound is about 65535/2 ???
if  I know to get sound db, how can i know db(decibel)?????