[PD] I'm stuck in a corner, please help! RE: [delta~] object

[marius schebella]

hmm,
first, i think you need [swap 1000] instead of [swap 1], because you 
want to delay by 1000/44100 milliseconds and not 1/44100 milliseconds.
and then, there is this problem that delwrite~/delread~ is sensitive to 
the order of creation. I attached a small patch, you can see that a 
delwrite/read that is created before the line~ object works similar to 
z~, wheras the delwrite/delread that is created after the line~ is one 
vector behind.
I attach a patch for clarification...
marius.

Andy Farnell wrote:
> 
> I've put an example here so you can hear that they are not the same
> 
> These differences are important.
> 
> 
> [rzero~] and [delwrite~] methods come out louder
> and with apparently less dynamics. Using [z~] and [fexpr~]
> I get much closer results to [delta~], more detail in
> the poured water sound.
> 
> As I said I needed an _EXACT_ replacement for [delta~] for
> other patches too, which are much more sensitive to the
> differences. (so this is all about how it behaves in practice
> not in theory :)
> 
> I'm really not sure why this happens. Suppose I should hook
> them up to a graph and read sample by sample to see what's
> really going on. But, it doesn't help me because without 
> changing the source the fact is
> 
> [delta~] is the same as [z~]
> [z~] is as good as [fexpr~]
> [rzero~ 1] and [delwrite~] are not the same
> 
> 
> Unless... If you hear no difference it could be an architecture
> thing... Tell me what machines you're running on, I wonder if that
> has anything to do with it?
> 
> cheers,
> 
> Andy
> 
> 
> 
> 
> 
> On Fri, 21 Mar 2008 10:47:44 +0100
> Frank Barknecht <fbar at footils.org> wrote:
> 
>> Hallo,
>> Miller Puckette hat gesagt: // Miller Puckette wrote:
>>
>>> If I'm doing it for myself, I run sig~ into rzero~ 1.
>> For all I know, [rzero~ 1] is the same as [delta~]: Both compute the
>> difference between the current and the previous sample. Or am I
>> missing something? Some time ago I added this to the CVS (now SVN) as
>> abstractions/purepd/delta~.pd
>>
>> Ciao
>> -- 
>>  Frank Barknecht                                     _ ______footils.org__
>>
>> _______________________________________________
>> PD-list at iem.at mailing list
>> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> PD-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: delwrite-bug.pd
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20080321/730a8489/attachment.asc>