[PD] Real-time Linux; hard req. and suggestions?

[Miller Puckette]

The filters on hardware A/D and D/A filters typically each add about 3 msec
latency at 44K1 - so if the software is doing 2 Msec, you can easily
end up seeing 8.  Theoretically, it should be possible to cut the filter
latencies in half by going to 48K, or to .3 msec apiece if you run
at 96K.  (It's inversely proportional to the Nyquist minus 20 KHz.)

cheers
Miller

On Fri, Sep 08, 2006 at 06:46:33PM +0200, Roman Haefeli wrote:
> On Fri, 2006-09-08 at 11:11 +0200, Frank Barknecht wrote:
> 
> > Stock 2.6 kernels now have excellent latency behaviour in the range of
> > 1-3 msec.
> 
> what do this values correspond to? when i set the latency of jackd to
> 2.9ms, i get a round trip in pd of about 7.4ms.  so when the term
> 'latency' with no further specificataions is used, the full round trip
> (analog signal -> adc~ > dac~ -> analog singal) is meant or the value
> set in pd or jackd? i just wonder if one could expect a round trip with
> the mentioned values (1-3 msec) with a well made setup.
> 
> roman 
> 
> 
> 
> 
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