[AG-TECH] query re: delay

Alan Sondheim sondheim at panix.com
Mon Oct 2 04:13:30 CDT 2006

The delay's been limited to 1 second but the silence suppression was off; 
I'll try it in the on position, and thanks - Alan

On Mon, 2 Oct 2006, Colin Perkins wrote:

> Hi,
> On 2 Oct 2006, at 09:00, Andrew A Rowley wrote:
>> In RAT, you can go to "Options..." then select "Reception" from the top 
>> menu.  From here you can limit the playout delay to 1 second (if I am 
>> reading it correctly).
>> Playout delay in RAT is adaptive - my understanding of this is that if 
>> there are lots of packets arriving late, it will increase the delay until 
>> there is enough that most packets arrive within the time of the playout 
>> delay.  I think that VIC does this too, but no so aggressively, hence the 
>> difference between audio and video delays.  I am guessing that you see lots 
>> of breaking up of the video which would show that it is having to throw 
>> away lots of late packets.
> Also, do you have silence suppression turned on in rat? If not, and if the 
> sender and receiver audio sampling clocks run at slightly different rates, 
> delay can build up and result in the type of problem you're seeing (rat 
> compensates for mismatched sampling clocks by varying the length of silent 
> periods, which it can't do if silence suppression is disabled).
> Colin

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