The XMOS microphone array library is designed to allow interfacing to PDM microphones coupled with efficient decimation to user configurable output sample rates. This library is only available for XS3 devices.
The microphone array library has the following features:
- 48kHz, 24kHz, 16kHz, 12kHz and 8kHz output sample rate by default (3.072MHz PDM clock)
- Configurable PDM clock divider
- Use the provided reference decimation filter or supply your own
- 1 to 16 PDM microphones
- Supports both SDR and DDR microphone configurations
- Framing with configurable frame size
- DC offset removal
- Extensible C++ design
The CHANGELOG contains information about the current and previous versions.
See the demos/ subdirectory for simple examples. Also, sln_voice uses this library extensively and contains multiple examples both bare-metal and under the RTOS. See https://github.com/xmos/sln_voice/tree/develop/examples.