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

Sylvain Munaut 246tnt at gmail.com
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 decode.you 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.


> 3.in 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.


Cheers,

     Sylvain




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