Thanks for Quick response.

I tried studying TSM code layer1 and Osmocom layer1 for purpose of implementing them in cellphone it self but i as far as i know that init of some variables required for amr are completed but couldnt be able to figure out what exactly part remaining .

also for decoding AMR convolution i made some changes to structures given by sylvain. I didnt know what i was doing but gave me correct output for encoding and decoding. but still i doubt its correctness. It would be great if some one could comment on these files.

may be need to pay attention soon

On Thu, Feb 28, 2013 at 2:37 PM, Harald Welte <laforge@gnumonks.org> wrote:

Dear Akib,

I think it is best if you start to read the actual relevant GSM
specifications if you want to implement part of it. The key word to
search for is probably the 'active code mode set'.

I will try to check specs again. i am really doubting about hysteresis part. cause i dont know whether its needed or not while storing raw frames. if any one know please let me know shall save my time.

At any given point in time, there can only be a set of four active
codecs in an AMR connection. The codec currently used within that set
is selected with CMI/CMR bits on the L1 of the air interface.

thanks for pointing out.

The selection of which four codecs are part of the currently active set is
explicitly configured by signalling messages on RSL between BTS and BSC,
as well as on Layer3 (RR) between BSC and MS.

On Thu, Feb 28, 2013 at 01:15:37PM +0300, Akib Sayyed wrote:
> Dear Sylvain
>
>
> While Decoding AMR do need to just decode and pack it into raw amr frames
> or we need to think about hysterasis and all parts also
>
>
> also there are total 8 codec modes
>
> but in band data have details of on 4 codec modes
>
> which one to choose out of 8 codec modes from those 8 modes.
>
>
>
>
>
>
> --
> Akib Sayyed
> Matrix-Shell
> akibsayyed@gmail.com
> akibsayyed@matrixshell.com
> Mob:- +91-966-514-2243

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- Harald Welte <laforge@gnumonks.org> http://laforge.gnumonks.org/
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--
Akib Sayyed
Matrix-Shell
akibsayyed@gmail.com
akibsayyed@matrixshell.com
Mob:- +91-966-514-2243