[PD] IEMlib and compilation optimised for P4s

Fri Nov 7 20:28:55 CET 2003

It's possible to make a good EQ using a chain of 
[equalizer]->[biquad~]s.  equalizer is from GGEE and generates peak 
filter coefficients for biquad~.  I've attached a 10-band eq that works 
pretty well, but the top and bottom bands should probably use lowshelf/
highshelf instead of equalizer.

Ben

On Friday 07 November 2003 12:37 am, David NG McCallum wrote:
> Nick,
>
> I was using one of the bp filters, which I think is a wrapper for the
> [filter~] object, so not the FIR~.
>
> I was just trying to build an EQ to replace a VST plugin I'm using
> right now. The problem was that my performance patch is heavily based
> on the use of delays and whenever the feedback got really small the
> filters in the EQ that it was ultimately going out just started
> freaking out.
>
> <sigh> Back to VST...
>
> David
> .
> . David McCallum
> .  Music wants to be free
> . http://mentalfloss.ca/sintheta
> .
>
> Nicholas Mariette wrote:
> > Hi David,
> >
> > I've recently had the same experience of unexpected high-CPU usage
> > from FIR~ in Iemlib (under WinXP).
> >
> > Which Iemlib filter have you had this experience with?
> >
> > I found that I can run a maximum of about 8 FIR filters of
> > 200samples length on a P4 2GHz.  This does seem a little low for
> > such a short FIR.
> >
> > I tried recompiling Iemlib with MSVC++6.0 but I got no performance
> > improvement.  I haven't yet looked at the code or tried special
> > compilers like the Intel compiler.
> >
> > However, I have found that Ben Saylor's partitioned convolution
> > external is somewhat more efficient for the same FIR filters.  If
> > you're referring to FIR filters, I'd try that external which can be
> > found here. http://home.gci.net/~pamsaylor/ben/partconv~-0.1.tar.gz
> >
> > And I'd be interested to hear of others' experiences with FIRs in
> > PD. Anyone?
> >
> > Nick
>
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