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Pulse-density modulation - Wikipedia
https://en.wikipedia.org/wiki/Pulse-density_modulation#:~:text=PDM%20is%20the%20encoding%20used%20in%20Sony%27s%20Super,clock%20indicates%20a%20bit%20from%20the%20right%20channel.
Understanding PDM Digital Audio - users.ece.utexas.edu
https://users.ece.utexas.edu/~bevans/courses/rtdsp/lectures/10_Data_Conversion/AP_Understanding_PDM_Digital_Audio.pdf
PDM, which uses only one bit to convey audio, is simpler in concept and execution than PCM. It has become popular as a way to deliver audio from microphones to the signal processor in mobile telephones. PDM is ideally suited for this task because it brings the benefits of digital, such as low noise and freedom from interfering signals, at low cost.
PDM Audio Software Decoding on STM32 …
https://www.st.com/resource/en/application_note/dm00040808-pdm-audio-software-decoding-on-stm32-microcontrollers-stmicroelectronics.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
More about PDM - Audio Precision
https://www.ap.com/technical-library/more-about-pdm/
PDM is Pulse Density Modulation, a system for representing a sampled signal as a stream of single bits using delta sigma conversion (sometimes called sigma delta conversion). PDM is the technology used in many oversampling ADCs and DACs, and is the basis of the Sony/Philips commercial digital format and disc trade-named DSD and SACD, respectively.
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