[asterisk-users] Codec Conversion

Jeff Brower jbrower at signalogic.com
Thu Aug 5 15:50:23 CDT 2010


> I tried to convert ilbc to ulaw and get the same
> result...Bad Voice Quality

I think you have to be more specific when you say "bad voice quality".  Like what?  Worse than a cellphone call?  Gaps
of audio missing?  Robotic or "cyborg" sound?  Static?  A background tone or buzzing?

iLBC isn't any worse voice quality than other LBR codecs (GSM-AMR, EVRC, etc).  If you want land-line quality and what
you're hearing is cellphone quality, then you're asking too much.  Otherwise, suggest to be specific and detailed in
describing your problem.


> On Thu, Aug 5, 2010 at 4:13 PM, Tim Nelson <tnelson at rockbochs.com> wrote:
>> ----- "michel freiha" <michofr at gmail.com> wrote:
>> >
>> > Dear All,
>> >
>> > i would like to ask please if someone tried to make a codec conversion
>> from ilbc to g729, because i did that but the voice quality was too bad and
>> a lot of disconnection..
>> >
>> > Can i get your feedback regarding this issue please?
>> >
>> > regards
>> I can't comment on your 'disconnection' as you don't say if that means the
>> call is disconnected or you're getting stuttered audio. Regardless, iLBC has
>> one of the lowest bitrates of the available codecs and as such the voice
>> quality is not spectacular to begin with. Take 'not so good' audio and try
>> to convert it to another audio format, and the deficiencies can be
>> exacerbated.
>> --Tim

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