[Asterisk-Users] Implant GIPS's codec to Asterisk

[Francois Menard (Mailing List Account)]

Speaking to this, does anybody know anyone who will join me in harassing 
Grandstream in implementing speex support in their phones?

f.

On Wed, 30 Mar 2005, Steve Kann wrote:

> Steve Underwood wrote:
>
>> Gustavo García wrote:
>> 
>>> Hi everybody,
>>> 
>>> GIPS have different products, not only codecs:
>>> * Voice enhancements: packet loss concealment algorithms, noise 
>>> concealment,
>>> jitter buffer, agc, aec....  (can be used with any codec)
>>> * Codecs: iLbc (free), ISAC, G711 Wideband...
>>> 
>>> You can include in asterisk voice enhancements and use them iLBC for
>>> example, for increasing the quality mainly in face of the packet loss,
>>> without using wideband codecs.
>>> 
>>> I'm not a GIPS employee :-), you can view more information in the GIPS
>>> website.
>>> 
>>> G.
>>> 
>> From what I have seen it appears those GIPS products are not particularly 
>> sophisticated. For example, have you any reason to believe they can achieve 
>> better jitter and packet loss handling than * with the new jitter buffer 
>> and PLC? That is not the world's most sophisticated, but as far as I get 
>> tell it is about on par with the GIPS offering. Does anyone have any 
>> evidence to the contrary?
>
>
> I've read about GIPS' jitterbuffer stuff, and I think that our jitterbuffer 
> implementation offers basically the same featureset.   I would imagine that 
> at this point, GIPS' implementation is probably better tested, but would be 
> much more difficult to integrate into *.
>
> As far as the other DSP functions you mention, libspeex provides all of 
> these, in varying degrees of progress (i.e. AGC, VAD, Denoise work pretty 
> well, AEC does not yet work very well).
>
> Also, as far as wideband codec support, Speex supports both wideband (16khz) 
> and ultra-wideband (32khz) modes, and these both work really well, as I use 
> them in other applications.
>
> The work to include these (free, as in speech and beer) codecs would probably 
> be roughly the same as for the wideband iLBC (not free, as in speech _or_ 
> beer), and would benefit everyone out-of-the box, as opposed to just those 
> who want to go through the trouble (and expense) of licensing a commercial 
> codec.
>
> -SteveK
>
>
>
>
>
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