Re: [Ekiga-list] sound quality is not good

[Jure Petrovic <fonz siol net>]

>From my practical experience g729 and speex use around 4.5 kbytes/sec,
whereas gsm uses around 6 kbytes/sec.

This is total network load, which is a bit bigger than codec bandwidth
as you must also calculate packet headers. Many times header size is
actually bigger than the payload (voice) itself.


Regards, 
Jure 


On Wed, 2007-05-30 at 17:32 +0200, michel memeteau wrote:
> Hi arnuld 
> 
> 2007/5/30, arnuld <geek arnuld gmail com>:
>         
>         yannick, now i got it. my bandwidth is low, only 256 kbps
>         which gives
>         the download rate of 29 kb/sec only. 
> 
> You upload rate is allso important as you want to send your voice as
> well , I  guess your adsl is 256/128 kbits which is 32 kBytes/s  // 16
> kBytes/s 
> 
> So using G711 which is around 80 kbits/s ( everybody agree ? )  is a
> little too much for a 128 kbits/s line. 
> 
> 
>         GSM = 8.0 kbps
>         SPEEX = 8.0 kbps
> 
> so you can even use the wideBand codecs Speex-WB : 20 kbits/s 
> 
>         and it works fine now :-)
> 
> Great ! so I guess it would also work on 56k lines .... 
> 
> 
>         (BTW, G.711 was unchecked by default)
> 
> It's true it would be better to put both speex WB and LB checked first
> then ILBC and GSM. if they are not available then ekiga would switch
> on G711 ? Am I right ? 
> 
> 
> -- 
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