This project acquires the PDM (Pulse Density Modulation) microphone signal using DFSDM (Digital filter for Sigma-Delta modulators interface) function of STM32 MCU and outputs its frequency characteristics by using FFT.
This project acquires the PDM (Pulse Density Modulation) microphone signal using DFSDM (Digital filter for Sigma-Delta modulators interface) function of STM32 MCU and outputs its frequency characteristics by using FFT.
Software CIC filter with SPI is here.
System Workbench for STM32 (SW4STM32) + STM32CubeL4
SPH0641LU4H-1 (Knowles)
Here is breakout board
The sample rate is too high for me, can i record with a lower sample rate. Or can i speed up the process of PDM to PCM.
Looking forward to your replay. Thank you.
Hello
I have some questions , how did you solder the MEM Microphone ?
does the output worth all the hassle of using digital microphone ? or it was just similar to the analog microphone ?
Do you have any videos of the output signal in real-time ?
Thanks in advance.
Hola, soy nuevo con esto de los microcontroladores stm32, y quería saber como graficaron la fft, o como se generaron las graficas.
Lo que pasa es que estoy diseñando unos filtros FIR pero nose como graficar la respuesta del filtro.
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