[asterisk-dev] iLBC packet loss concealment (was: code-cleanup concerns)

[Mike Taht]

On 4/16/06, Steve Underwood <steveu at coppice.org> wrote:
>
> These days, you can achieve far better quality than a normal phone call
> at rates much lower than 64kbps.
>
> The main quality issue with normal phone calls is they are limited to
> 4kHz bandwidth. This is insufficient for good quality speech. 8kHz
> bandwidth really improves things. It lets you distinguish things "f"
> from "s", which is almost impossible on a normal phone line. In the


This is one reason why good quality, in particular, continuous, voice
recogition is nearly impossible over POTS. Even with limited domains, at
8khz it's all billions of dollars of R&D can do just to consistently
mis-recognize "T-birds Pizza" in Los Gatos as "P-Birds Pizza".

I note that this article on the wiki debunks the ilibc assumption for skype
and goes into some depth:

http://www.voip-info.org/wiki/view/Wideband+VoIP

I went looking at mattf's asterisk wideband branch - seems out of date, is
it dead?
http://svn.digium.com/view/asterisk/team/mattf/asterisk-wideband/

and some interesting old threads...
http://lists.digium.com/pipermail/asterisk-dev/2005-June/013314.html



--
Mike Taht
PostCards From the Bleeding Edge
http://the-edge.blogspot.com
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