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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.
More about PDM - Audio Precision
https://www.ap.com/technical-library/more-about-pdm/
The PDM signal can be converted back to analog audio by passing it through a low-pass filter. PCM to PDM. A signal that is coded as PCM (pulse code modulation, the coding widely used in digital audio) can be converted to PDM by sampling it at a higher rate (interpolating) and reducing the word length to one bit.
PDM — Pulse density modulation interface
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/pdm.html
The pulse density modulation (PDM) module enables input of pulse density modulated signals from external audio frontends, for example, digital microphones. The PDM module generates the PDM clock and supports single-channel or dual-channel (Left and Right) data input. Data is transferred directly to RAM buffers using EasyDMA.
Interfacing PDM digital microphones using STM32 …
https://www.st.com/resource/en/application_note/dm00380469-interfacing-pdm-digital-microphones-using-stm32-mcus-and-mpus-stmicroelectronics.pdf
audio capability with a rich connectivity, including serial and enhanced voice-acquisition interfaces allowing the user to easily build solution for microphone-based applications. This document targets digital MEMS microp hones having a pulse-density modulated (PDM)
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