# iBook Modem Audio

- From: Alex Papazoglou \<hidden\>
- Date: 2002-07-28 16:26:18 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2002/07/9383856

```text

This message is directed at people working with (new) iBooks.

When a dialout command is issued to the iBooks internal modem and the
modem's "volume" (ATMx) is non-zero, the modem begins transmitting call
progress digital audio over the serial link. I'm wondering if anybody has
any information on the format of the stream. I have managed to get
something approximating the expected sound by using sox with a
sampling rate of 8000 using some logarithmic 16-bit encoding (or maybe 8
bits at around 16000?), so I'm reasonably confident that getting call
progress sound for your iBook2 is doable. Unfortunately, I know nothing
about sound encoding.

Anybody know more about this?

Alex Papazoglou


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
```