[PD] latency issue

[Hans-Christoph Steiner]

On Oct 18, 2009, at 11:19 PM, Hans-Christoph Steiner wrote:

>
> On Oct 18, 2009, at 8:47 PM, Justin Glenn Smith wrote:
>
>> Bjørn Nielsen wrote:
>> ...
>>> Fast Track Pro soundcards. (I must also add that I have no latency  
>>> in
>>> any other music software I use: pro tools, digital performer,
>>> audacity, garageband etc.)
>> I find this very hard to believe, is this just because you are  
>> auditioning
>> your realtime input directly through the sound card? Because no  
>> software
>> can process audio input and output a modified version without  
>> latency. Try
>> playing through a plugin in realtime in protools or dp, I suspect  
>> you will
>> notice a latency. If not, maybe you should be translating your pd  
>> patches
>> into audio unit plugins, but I strongly suspect you will notice a  
>> latency.
>
> There is no audio software without latency.  The lowest that is  
> feasible on Mac OS X is probably 4ms.   Once you factor in distance  
> and speed of sound, then you might see that 20ms of latency isn't  
> really all that much.
>
> 20ms * 343m/s = 7.546m
>
> So if you are 7.5m away from one of your band mates, there will 20ms  
> of latency just from the sound travelling thru the air.
>
> .hc


Also, I forgot to mention, there was a thorough discussion on latency  
a few years ago:

http://lists.puredata.info/pipermail/pd-ot/2006-12/001629.html

.hc


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