rasp pi audio input

その1 usb apaptor

マイクとusb audio 変換アダプタでusb入力。ras pi 上でwave変換。

その2 i2s mic

i2sマイクで入力。ras pi上でwave変換。

jetson tx2 i2s tdm

max clock 24.576mhz

8ch x 16bit x 192khz = 24.576mhz
8ch x 32bit x 96khz = 24.576mhz

以下は不明。16chまでという話がnanoであったので。

32ch x 16bit x 48khz = 24.576mhz
128ch x 8bit x 24khz = ditto

とすると、

16ch x 16bit x 96kz に対応？

jetson nano tdm

jetson mano もTDM対応。16chまで？
m.2のi2sを使って合計32chまで？

Unfortunately not on the 40-pin header. There is a 2nd I2S interface that is available on the M.2 Key E connector (which is located on the main board under the module). 

Please note that each I2S interface can support upto 16 channels in TDM mode. So if you are using a codec that supports either the dsp-a or dsp-b timing modes, then you can have more than 2 channels.

https://devtalk.nvidia.com/default/topic/1049674/jetson-nano/audio-i2s-on-40-pin-connector/1