atom feed12 messages in at.iem.pd-list[PD] Re: Looping
FromSent OnAttachments
PORRESJan 30, 2007 11:18 am.wav
padawan12Jan 31, 2007 6:14 am 
PORRESFeb 2, 2007 8:55 am 
PatcoFeb 2, 2007 2:23 pm 
hard offFeb 2, 2007 4:36 pm 
David PowersFeb 2, 2007 7:23 pm 
hard offFeb 2, 2007 10:09 pm 
hard offFeb 2, 2007 10:30 pm 
carmenFeb 2, 2007 10:57 pm 
patrickFeb 2, 2007 11:10 pm 
PORRESFeb 3, 2007 1:45 pm 
Kyle KlipowiczFeb 4, 2007 10:44 am 
Subject:[PD] Re: Looping
From:PORRES (ment@yahoo.com)
Date:Feb 2, 2007 8:55:21 am
List:at.iem.pd-list

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.

cheers

alex

padawan12 <pada@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)

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.

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