[PD] throw~/catch~ headroom

brandon zeeb zeeb.brandon at gmail.com
Mon May 4 02:55:30 CEST 2009


Andy,

Great idea, I'll keep that in mind.

You are correct, [throw~]/[catch~] does not contain a set maximum value.  In
the process of swapping out the cascading [+~] objects, I introduced a
"feature" to the system which was causing the distortion.

Cheers,
~Brandon

On Sun, May 3, 2009 at 5:26 AM, Andy Farnell <padawan12 at obiwannabe.co.uk>wrote:

>
>
> I looked for that in dsp_add() myself, but couldn't see it.
>
> On a practical note; having long suspected this while working
> with numbers of [throw~][catch~] buses at the mix stage it
> helps to introduce DC traps before every [throw~].
>
> A solution where you have a seemingly untracable offset that
> messes all your [throw~][catch~] system, is to use a [delwrite~ a 1]
> and several [delread~ a 1] objects in place of [throw~] and [catch~]
>
>
> On Sat, 02 May 2009 23:49:35 -0400
> Martin Peach <martin.peach at sympatico.ca> wrote:
>
> > brandon zeeb wrote:
> > > Hey PD-List,
> > >
> > > Has the throw~/catch~ system been designed to have a different
> available
> > > headroom than standard [+~] and [*~] objects?
> > >
> > > I've been designing a few polyphonic patches and have decided to use
> > > throw~/catch~ instead of hard-wiring the summing bus.  I've found that
> > > when the signal approaches 1.0, distortion occurs.  Has this been
> > > designed as such for a reason?
> > >
> >
> > Yes, [throw~] and [catch~] and all the other dsp objects can handle
> > signals up to the limits of the float type in the c programming
> > language. However 1.0 is designed to correspond to the highest voltage
> > the dac in your sound card can send to your amplifier. Any sample value
> > above 1.0 or below -1.0 will be clipped to those limits.
> > The output of a summing bus with subsequent processing will start
> > clipping before any individual signal actually reaches 1.0.
> >
> > Martin
> >
> >
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>
> --
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>
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