[PD] Re: Looping

PORRES mentalosmosis at yahoo.com
Fri Feb 2 17:55:44 CET 2007

hi there, thanks for looking at it for me, I really apreciate it...

Im not sure wether this problem might be indeed the DC offset, it seems that is a particular problem with pd looping stuff around. This is because it's a quite drastic click that I do not hear when I loop it on Sound Forge...

Do you know what I mean???????

anyway... I tried a high pass filter on sound forge, and it didn't work that well, it kinda made it click when it didn't...

As for the spectrum loop and timbre change, I see what you mean, I will try to do it, I couldnt invert the phase so far.



padawan12 <padawan12 at obiwannabe.co.uk> wrote: Looks like you cut it right for the phase actually.
What I notice looking at it in the editor is quite a bit of VLF, there's
a wobble in there at about 2-4 Hz. Very low frequencies tend to give you 
a DC offset mismatch wherever you cut it, so try high passing it at
above 20Hz.

Also, there's a bit of movement in the spectrum up top, quite a noisy
effect that might be making it difficult to loop without an apparently
sudden change of timbre. There are two ways around this. One is to make
a crossfade of 3 sections, mix them down and then cut it 1/3 of the way
from each end, the start and end will have the same spectrum. The other
way is to double the length of it by copying, reverse, invert phase and
insert append (you get a symmetrical forwards - backwards loop that starts
and ends on the same spectrum)

On Tue, 30 Jan 2007 11:18:37 -0800 (PST)
PORRES  wrote:

> thanks, the samples seem to be ok when looped in sound forge and all... check the wave loop file attached.
> cheers
> alex
> Charles Henry  wrote: Hey, there, Alex,
>   I had been talking about this with Andy a while back, and we
> concluded that clicking occurs because of phase discontinuities
> between the beginning and end of the loop.  Could you send me the
> loop?  Any thoughts, Andy?
> Best wishes,
> Chuck
> On 1/30/07, PORRES  wrote:
> > hi there, I edited a nice sample to play looped in od, but it clicks a lot,
> > i dont know why... anyone ever had this problem and has any ideas on
> > overcoming it?
> >
> > cheers
> >
> > alex
> >
> > Charles Henry  wrote:
> >  By the way, Kim, could you tell me what the feedback loop is? (what
> > kinds of operations are you using?.... is it linear?...etc...) If
> > it's linear, you should be able to replace the feedback loop with an
> > equivalent operation, which circumvents the whole problem.
> >
> > Chuck
> >
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