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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
In order to convert the incoming data stream into PCM audio samples, a decimation filter is included in the PDM interface module. The input of the filter is the two-channel PDM serial stream (with left channel on clock high, right channel on clock low), its output is 2 × 16-bit PCM samples at a sample rate 64 times lower than the PDM clock rate.
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
July 2019 AN5027 Rev 2 1/66 1 AN5027 Application note Interfacing PDM digital microphones using STM32 MCUs and MPUs Introduction Digital MEMS (microelectromechanical systems) microphones target all audio applications
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 is using an I2S interface that reads the bits in 16-bit blocks and uses DMA to put it into memory for you (no I/O reads in a loop needed), so she reads 4, 16-bit samples to get 64 bits of PDM data and then converts that to one 16 bit output value with a sum-product of those bits against the constants in her filter.
Audio Interface: I2S, TDM and PDM on PublicWiki
https://trello.com/c/OglN8teL/27-audio-interface-i2s-tdm-and-pdm
L changed description of Audio Interface: I2S, TDM and PDM L renamed Audio Interface: I2S, TDM and PDM (from I2S, TDM and PDM) L added I2S, TDM and PDM to Embedded
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
AN3998 PDM audio software decoding library description Doc ID 022391 Rev 1 7/10 5 PDM audio software decoding library description The PDM library is composed of a structure and the implementation of four PDM filter functions. The library uses two buffers, the PDM Input buffer and the PCM Output buffer; the
Stereo PDM to I2S/TDM Converter - Analog Devices
https://www.analog.com/media/en/technical-documentation/data-sheets/ADAU7112.pdf
(PDM) bit streams into one pulse code modulation (PCM) output stream. The source for the PDM data can be two microphones or other PDM sources. The PCM audio data is output on a serial audio interface port in either inter-IC serial (I 2 S) or time domain multiplexed (TDM) format. The ADAU7112 is specified over a commercial temperature
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