On Mon, 11 Dec 2000 16:37:12 -0500 (EST) Karl MacMillan karlmac@peabody.jhu.edu wrote:
# Ricardo, # # > I got these results now, 11.dec.2000: # > G3/350 Blue- Motu2408 mkII # > Driver: ASIO PCI-324 # > # Thanks for the hard numbers! How did you measure this? # # Karl
#
There is a latency test patch written by L. Stuck for MSP. It measures your system's input-output latency, by running a cable from your card's output (888/24, motu2408.... AMIII) to its input and boosting the output volume of your computer/card. So later you can also test by adding your external devices (i.e. mixer) to the loop, the amount of real latency you might have in a concert situation. The delay test is a simple delay~ object set to 74 samples. By using the same patch as before, audio is passed through the delay~ and the delay time is measured. It an also be good to measure the delay of your own msp patches by replacing the delay~ object with your MSP patch.
In theory the motu2048 should have a latency around 6ms I think.
Ricardo
#
# > In-out latency test:
# > 2226 samples = 50.476189 ms
# >
# > Delay lines:
# > 74 samples = 1.678005 ms
# >
# > I have also found the fact that midi behaviour is quite unstable
# > when using OMS, the Miditimepiece(USB) MTP AV under Macos 8.6
# > and running MaxMSP.
# >
# > Ricardo
# >
# > -------------------------------------------------
# > # On Mon, 11 Dec 2000, Michael Lechasseur wrote:
# > #
# > # >
# > # > Perhaps you could dual boot to Linux? I don't have any latency data for PD
# > # > on Win2000, but if you'd like to write a latency test patch, I could run it
# > # > on my system and send you the results?
# > # >
# > # > I've wanted to test this since applying the kernel low-latency patch, and
# > # > have never gotten around to it.
# > # >
# > # > I have an Athlon 600, 64MB Ram, Redhat 6.2, Kernel 2.2.16 with the
# > # > low-latency patch.
# > # >
# > # > > -----Original Message-----
# > # > > From: d d [mailto:denglertdp@hotmail.com]
# > # > > Sent: Monday, December 11, 2000 1:02 PM
# > # > > To: pd-list@iem.kug.ac.at
# > # > > Subject: performance in pd - audiobuf, etc
# > # > >
# > # > >
# > # > > Hello, I'm new to PD, and have been using it sporadically for
# > # > > several weeks.
# > # > > It is extremely interesting, seems to do the things I can't do with my
# > # > > NordModular. My thanks to all who made it possible!
# > # > >
# > # > > I know you probably don't want to hear this question again, but I was
# > # > > wondering if there was a way to get real time audio processing
# > # > > performance
# > # > > out of PD. (windows 2000 pent III 500mHz, awe64, echo layla 20bit)
# > # > >
# > # > > I've tried adjusting all the command params, disabling devices, changing
# > # > > audiobuf, etc
# > # > >
# > # > > Is there anyway to knock the latency to hardware like levels on
# > # > > my system?
# > # > > Even if the answer is different hardware, OS, etc
# > # > > I'm considering a Mac purchase because cycling74 claims w/
# > # > > certain hardware
# > # > > a 6ms latency can be had.
# > # > > Is anything this low possible with PD?
# > # > > I'd much rather stay within windows.
# > # > >
# > # > > Sorry for the bother with this question
# > # > >
# > # > > I'd like to have this ultimate control over processing/creating
# > # > > that PD can
# > # > > give, but I also need hardware like latency In/Out
# > # > > I don't want to spend money on a Kyma, because it seems logical that a PC
# > # > > can do this sort of thing these days (what with the nifty fast chips and
# > # > > all)
# > # > >
# > # > > Thanks all who read this far, sorry for the dull question
# > # > > -daniel
# > # > > _________________________________________________________________
# > # > > Get your FREE download of MSN Explorer at http://explorer.msn.com
# > # > >
# > # >
# > # >
# > #
# > # --
# > # _____________________________________________________
# > # | Karl W. MacMillan |
# > # | Computer Music Department |
# > # | Peabody Institute of the Johns Hopkins University |
# > # | karlmac@peabody.jhu.edu |
# > # | www.peabody.jhu.edu/~karlmac |
# > # -----------------------------------------------------
# > #
# > #
# >
# >
# >
#
# --
# _____________________________________________________
# | Karl W. MacMillan |
# | Computer Music Department |
# | Peabody Institute of the Johns Hopkins University |
# | karlmac@peabody.jhu.edu |
# | www.peabody.jhu.edu/~karlmac |
# -----------------------------------------------------
#
#
Ricardo Climent