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AN3998 Application note - STMicroelectronics
https://www.st.com/content/ccc/resource/technical/document/application_note/ca/18/be/bb/f8/53/47/a5/DM00040808.pdf/files/DM00040808.pdf/jcr:content/translations/en.DM00040808.pdf#:~:text=5%20PDM%20audio%20software%20decoding%20library%20description%20The,must%20define%20these%20buffers%20in%20the%20main%20program.
AN3998 Application note - STMicroelectronics
https://www.st.com/content/ccc/resource/technical/document/application_note/ca/18/be/bb/f8/53/47/a5/DM00040808.pdf/files/DM00040808.pdf/jcr:content/translations/en.DM00040808.pdf
InternalFilter: Defines a 34 Byte memory used internally by the library during the PDM decimation step. The PDM audio software decoding library includes one header file pdm_filter.h and binary/object codes for the following platforms: libPDMFilter_IAR.a : for IAR compiler libPDMFilter_Keil.lib : for ARM compiler
PDM library - Arduino - PDM
https://www.arduino.cc/en/Reference/PDM
The PDM library allows you to use PDM (Pulse-density modulation) microphones, such as the on board MP34DT05 on the Arduino Nano 33 BLE Sense. To use this library #include <PDM.h> The library takes care of the audio that will be accessible also through the ArduinoSound Library. Functions. begin() end() available() read() onReceive() setGain() setBufferSize()
AudioDemo | Mbed
https://os.mbed.com/teams/Senior-Design-Sound-Monitor/code/AudioDemo/docs/tip/pdm__filter_8h.html
Detailed Description. Header file for PDM audio software decoding Library. This Library is used to decode and reconstruct the audio signal produced by ST MEMS microphone (MP45Dxxx, MP34Dxxx). For more details about this Library, please refer to document "PDM audio software decoding on STM32 microcontrollers (AN3998)".
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