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== APU ==

The APU pre-processing module is responsible for the pre-processing of voice direction and voice data output.

* Up to 8 channels of audio input data, ie 4 stereo channels
* Simultaneous scanning pre-processing and beamforming for sound sources in up to 16 directions
* Supports one active voice stream output
* 16-bit wide internal audio signal processing
* Support for 12-bit, 16-bit, 24-bit, and 32-bit input data widths
* Multi-channel direct raw signal output
* Up to 192kHz sample rate
* Built-in FFT unit supports 512-point FFT of audio data
* Using system DMA to store output data in system memory

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