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Akib Sayyed akibsayyed at gmail.comThanks 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 at 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 at gmail.com > > akibsayyed at matrixshell.com > > Mob:- +91-966-514-2243 > > -- > - Harald Welte <laforge at gnumonks.org> > http://laforge.gnumonks.org/ > > ============================================================================ > "Privacy in residential applications is a desirable marketing option." > (ETSI EN 300 175-7 Ch. > A6) > -- Akib Sayyed Matrix-Shell akibsayyed at gmail.com akibsayyed at matrixshell.com Mob:- +91-966-514-2243 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20130228/a0780e98/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: conv_tch_afs.c Type: text/x-csrc Size: 18111 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20130228/a0780e98/attachment.bin>