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Open source PDM filter for MP45DT02 mic

Question asked by volkov.oleg on Jan 7, 2013
Latest reply on May 6, 2017 by Clive One
Recently I have implemented small educational project on STM32F4Discovery board. It takes sound from on-board MP45DT02 MEMS microphone. Unfortunately the libPDMFilter does not have the source code. Besides it looks like having IIR implementation which I also don't like. So I have implemented small and efficient FIR filter which works fine for me. It may be easily customized if you don't like default 8kHz cutoff - see attachment.