<br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Mike McGonagle</b> <<a href="mailto:mjmogo@gmail.com">mjmogo@gmail.com</a>><br>Date: Thu, Mar 20, 2008 at 7:18 PM<br>
Subject: Re: [PD] I'm stuck in a corner, please help! RE: [delta~] object<br>To: Andy Farnell <<a href="mailto:padawan12@obiwannabe.co.uk">padawan12@obiwannabe.co.uk</a>><br><br><br><div>Andy,</div><div><br></div>
If it is a book about PD, why not add a tutorial for writing externals, and then show how [delta~] is written (with nods to the original author?), and then use that external?<div>
<br></div><div>By the way, if you are looking for a Proof Reader, I would be more than happy to offer my services...</div><div><br></div><div><br>
</div><div>Mike</div><div><div><div></div><div class="Wj3C7c"><br><br><div class="gmail_quote">On Thu, Mar 20, 2008 at 6:40 PM, Andy Farnell <<a href="mailto:padawan12@obiwannabe.co.uk" target="_blank">padawan12@obiwannabe.co.uk</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
I have a problem, that is partly of my own making and need to air<br>
this on the list for advice. This isn't a rant, just a frustrating situation.<br>
<br>
As some of you know I have been working on a textbook for Pd for some time.<br>
In the final stages and adding the practical exercises and the problem is this:<br>
<br>
<br>
The book is completely for vanilla Pd to keep things simple and I really don't<br>
want to change this.<br>
<br>
I have three crucial exercises that use [delta~]<br>
<br>
[delta~] does not exist in vanilla Pd<br>
<br>
[delta~] must be recreated _EXACTLY_ as the external behaves.<br>
<br>
It IS possible to recreate [delta~] exactly using [z~]<br>
<br>
[z~] does not exist in vanilla<br>
<br>
It is not, as far as I can see, possible to emulate [delta~] using<br>
[rzero~] or any other signal domain method, in a way that doesn't<br>
confuse the hell out of the reader or provide unsatisfactory results.<br>
<br>
I am left with these options:<br>
<br>
<br>
1) Drop three of the most interesting exercises from the textbook.<br>
<br>
2) Change my policy and make the textbook require pd-extended on account of<br>
only _one_ object!<br>
<br>
3) Find a vanilla replacement for [delta~] that is simple. (less than three objects)<br>
<br>
4) Convince Miller to include [delta~] in vanilla<br>
<br>
5) Convince Miller to include [z~] in vanilla<br>
<br>
<br>
To the list: I'm hoping some bright spark will solve (3). Be warned, it isn't as<br>
simple as it seems, AFAICS. [rzero~] should provide a differentiator response in<br>
theory. In practice dealing with the offsets and scales ruins the whole show and<br>
leads to over-complex and unstable patches. Using [biquad~] is extremely confusing<br>
to most readers and I don't want to do this. You cannot obtain a single sample delay<br>
using [delwrite~] as far as I know, if you can it certainly means [samplerate~] must<br>
be added to all patches to make sure they run at different sr, which is mucho annoying.<br>
<br>
To Miller: Please consider admitting [z~] or [delta~] (I actually prefer the former<br>
because it is more educational to see differentiator built from sample delay)<br>
into the vanilla distro. This would need to be time for release quite soon. I'm sure<br>
it would greatly benefit Pd to do this.<br>
<br>
Best regards 2 all,<br>
<br>
Andy<br>
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--<br>
Use the source<br>
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</font></blockquote></div><br><br clear="all"><br></div></div><font color="#888888">-- <br>Peace may sound simple—one beautiful word— but it requires everything we have, every quality, every strength, every dream, every high ideal.<br>
—Yehudi Menuhin (1916–1999), musician
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</div><br><br clear="all"><br>-- <br>Peace may sound simple—one beautiful word— but it requires everything we have, every quality, every strength, every dream, every high ideal.<br>—Yehudi Menuhin (1916–1999), musician