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PDM — Pulse density modulation interface
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/pdm.html#:~:text=PDM%20%E2%80%94%20Pulse%20density%20modulation%20interface.%20The%20pulse,single-channel%20or%20dual-channel%20%28Left%20and%20Right%29%20data%20input.
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 — Pulse density modulation interface
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/pdm.html
PDM — Pulse density modulation interface 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.
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
Interfacing PDM digital microphones using STM32 MCUs and MPUs Introduction Digital MEMS (microelectromechanical systems) microphones target all audio applications where small size, high sound quality, reliability and affordability are key requirements.
How to interface to a PDM audio source? - Electrical ...
https://electronics.stackexchange.com/questions/404393/how-to-interface-to-a-pdm-audio-source
The code above is configured to produce 16-bit resolution output values, at a rate of 16,000 samples a second. It runs the PDM microphone at 64 times that frequency, which is 1.024 MHz. So she's using a 64 coefficient size filter, to convert each block of 64 PDM bits, to one 16 bit output sample.
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