is the Viterbi decode for the AFS provided by Sylvain right?

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Sylvain Munaut 246tnt at
Fri Jul 27 06:14:26 UTC 2012

> 1.when I have decode the TCH, and ready write to file, how to set the last
> argument of the function.
> length = osmo_ubit2pbit_ext(voice, 0, EFRAMR, 0, 8 + gsm690_12_2_len,
> 0/1);is it 0 or 1? I use your
> burst_id branch.

Most likely 0

> 2.are you test your code relate to TCH AMR? have you ever succeed to listen
> the voice coded by AMR, in your clarifications about 27C3 GSM Sniff Talk, I
> find you hadn`t completed the AMR said:"  - ... But since I'd
> like it to support AMR and viterbi soft output before that happens, it could
> take some time." how about your current process?

The code isn't ready yet and since I'm not actively working on it ATM,
it's not really progressing.

> your SDCCH sniffer demo, you use snr of the channel to decide a over of
> a channel, but in the speech of amr, because of DTX, it can not be used, how
> to settle the problem because I can`t implement the full stack.

The SAACH associated with TCH doesn't have DTX so you can check if the
channel is active by only looking for power during the SAACH burts.



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