[asterisk-dev] Jitterbuffer and FAXes with E1

[Martin Vít]

Klaus Darilion wrote:
> Zoa wrote:
>   
>> Because the jitter buffer will never be size zero if its a fixed jitter 
>> buffer and will fluctuate if its a variable length jitter buffer.
>> So whatever you choose, the timing will be altered.
>>     
>
> I would think that a fixed jitter buffer is a fixed jitter buffer - 
> thus, only buffering voice frames adding a fixed delay (thus reducing 
> jitter but increasing delay) and do not change the audio data at all.
>
> A dynamic jitter buffer of course is bad. Because of the dynamic 
> behavior the audio samples have to be played back sometimes 
> faster/sometimes slower.
>
>   
Hi,

Finally as i wrote yesterday, the problem with faxes was in noise filter 
in sangoma HW echocan (fixed now).
> Thus, why does static jitter buffer manipulate the audio?
>   
Static nor adaptive buffer does not manipulate frames. I've compare it 
frame by frame when the frame come to buffer and when it goes out.
> @Martin: What happens if you call the Milliwatt() application via a 
> jitter-buffer link? Do you hear frequency change?
>   
Asterisk jitterbuffer is not capable of frequency change. It only 
buffers frames and if needed it sends info to translater to do PLC (if 
it is capable).



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