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

Akib Sayyed akibsayyed at
Sat Feb 23 16:06:56 UTC 2013

Dear Sylvain

In code provided above there is no
*conv_tch_afs_XX_XX_next_term_state* &*
conv_tch_afs_10_2_next_term_state*struct for some of bitrate so its
giving wrong output for convolution

is it possible to give complete conv_tch_afs.c decode.

On Thu, Jul 26, 2012 at 12:23 PM, Sylvain Munaut <246tnt at> wrote:

> >  search some materials, find that the decode method of AFS convolutional
> > code is different from the EFS`, it use RSC, and need SOVA(soft output
> > viterbi algorithm). am i right?
> No.
> It _does_ use RSC (and the viterbi code in libosmocore supports RSC).
> But that has nothing to do with SOVA and SOVA is _not_ required at
> all.
> AFAIK, the AMR code I sent a while is correct. Just to be sure I
> attached the latest version I have. I haven't tested all the modes but
> at least 12.2 and 10.2 should be correct.
> Cheers,
>     Sylvain

Akib Sayyed
akibsayyed at
akibsayyed at
Mob:- +91-966-514-2243
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