[PD] Cyclone in vanilla?
brbrofsvl at gmail.com
Thu Apr 24 08:23:51 CEST 2008
I think the one-sample delay is given by [rzero_rev~ 0] -- (y[n] =
-a[n] * x[n] + x[n-1]) -- but [z~] takes an argument for any
delay by sample.
Also, using a filter to achieve the delay might be putting the cart
before the horse in pedagogical situations -- here [fexpr~] is
probably better, but its maximum delay is the current vector length,
and to me it feels somewhat expensive in production situations.
Another option for something like [z~] that might integrate better
with delay representation in pd could be an object that simply reads
from [delwrite~] like [delread~] and [vd~], but whose argument is a
sample-wise delay -- however, this is easily done via an abstraction.
This would obviate the need for each instance to have its own internal
delay allocation which could be useful for someone who wanted to use
it to build something like a several-hundred-point direct convolution
patch. Still, if others are used to the [z~] in zexy, it might be
better to go with that model if it's going to be implemented in
> Date: Wed, 23 Apr 2008 13:17:40 -0700
> From: Miller Puckette <mpuckett at imusic1.ucsd.edu>
> Subject: Re: [PD] Cyclone in vanilla?
> To: pd-list at iem.at
> Message-ID: <20080423201740.GI15867 at imusic1.ucsd.edu>
> Content-Type: text/plain; charset=us-ascii
> I believe z~ is just rzero~ 0.
> On Wed, Apr 23, 2008 at 11:24:34AM +0200, Frank Barknecht wrote:
> > Hallo,
> > Matt Barber hat gesagt: // Matt Barber wrote:
> > > Actually, for those of us who insist on vanilla and do everything with
> > > expr/expr~/fexpr~ or abstractions, is it possible to implement [z~] in
> > > fexpr~ for a delay larger than its vector size? You could do it with
> > > an abstraction using [delwrite~] and [delread~], setting the [block~]
> > > to 1, and then set the delay as a ratio to the [samplerate~] -- the
> > > difficulty in making it work correctly here is setting the size of the
> > > [delwrite~] efficiently (this could maybe be done with a loadbang
> > > routine that would send a message to a subpatch in the abstraction
> > > instance to add and connect a delwrite~ with the proper delay
> > > allocation...).
> > You don't need to set the block~-size to 1, and personally I would
> > just make the delwrite~ "big enough". It's cheap to store things in a
> > delay. But anyway, attached is a z~-clone with delwrite~/delread~ that
> > uses a helper abstraction created dynamically.
> > Ciao
> > --
> > Frank Barknecht _ ______footils.org__
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