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Siemens XT55
3.10 Audio interfaces
XT55 comprises three audio interfaces available on the board-to-board connector:
Two analog audio interfaces, each with a balanced analog microphone input and a
balanced analog earpiece output. The second analog interface provides a supply circuit
to feed an active microphone.
Serial digital audio interface (DAI) using PCM (Pulse Code Modulation) to encode analog
voice signals into digital bit streams.
Страница 56 в документации.
Осталось только найти это в модулях попроще...
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