Disable the vocoder in the DSP

Andrey andrey.osmocom at gmail.com
Wed Feb 17 19:38:27 UTC 2016


On 2/16/16, Sylvain Munaut <246tnt at gmail.com> wrote:
> It's neither PCM audio, nor raw TCH bits.
>
> They're the raw codec data ( so 260 bits / 20 ms for FR codec ).
>
> I say they're not the raw TCH bits because the DSP is still doing all
> the channel coding / error correction and this process is codec
> specific. The bits will be re-ordered and some of them will be
> protected by ECC and some won't because the channel coding excpect to
> find GSM FR codec bits there.

What you just described is exactly what I need - awesome! Now I need
to study the implementation code in both layer1 and layer23 and
understand how it works - any pointers?

Thanks a lot for the help!


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