[PD] iemlib low pass filters exhibiting jitter?
hi, just a quick question, is it normal or somewhat on purpose that all versions of low pass filters in iemlib (from lp2 - lp10 and cheb, butt, bess and crit) exhibit slight high pitched jitter when cutoff frequency is being dynamicly changed? is it a nature of such filter or just a type of implementation that somewhat doesn't take care of interpolation (if interpolation is a problem at all)? any thoughts welcome... is there a way i could avoid that jitter with these filters? is there some other high-pole low pass filter in some other library i could use? sure, i can always use series of [lop~] .. best, luka -- sujet est machinique! Nova deViator ¤ http://deviator.si ¤ http://skylined.org ¤ pgpFY5k2xpLbh.pgp Description: PGP signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] iemlib low pass filters exhibiting jitter?
I've noticed this, too. It sounds like the noise you'd get if you were just using [line] to change the frequency. My guess is the cutoff frequency is being sampled and held at the block boundaries. If you put these objects in a patch with [block~ 1], it goes away. .mmb On Wed, Mar 2, 2011 at 11:25 AM, Luka Princic // Nova deViator n...@deviator.si wrote: hi, just a quick question, is it normal or somewhat on purpose that all versions of low pass filters in iemlib (from lp2 - lp10 and cheb, butt, bess and crit) exhibit slight high pitched jitter when cutoff frequency is being dynamicly changed? is it a nature of such filter or just a type of implementation that somewhat doesn't take care of interpolation (if interpolation is a problem at all)? any thoughts welcome... is there a way i could avoid that jitter with these filters? is there some other high-pole low pass filter in some other library i could use? sure, i can always use series of [lop~] .. best, luka -- sujet est machinique! Nova deViator ¤ http://deviator.si ¤ http://skylined.org ¤ ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list -- Mike Moser-Booth mmoserbo...@gmail.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] pix_buffer_write not writing
I'm trying to get pix_buffer_write to write pix_video to a buffer but it doesn't seem to be writing. Do I have to do something specific? Here's what I have. If I change the name of the pix_buffer_read buffer, the pd window spits out a stream of buffer not found errors, as one would expect. However, if I change the name of the pix_buffer_write buffer, nothing. So it looks to me like it's not doing anything at all. [pix_buffer video] [gemhead] | [pix_video] | [pix_buffer_write video] [gemhead] | [pix_buffer_read video] | [pix_texture] | [rectangle 4 3] -- * Pall Thayer artist http://www.this.is/pallit * ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] pix_buffer_write not writing
Never mind... got it. On Wed, Mar 2, 2011 at 2:21 PM, Pall Thayer pallt...@gmail.com wrote: I'm trying to get pix_buffer_write to write pix_video to a buffer but it doesn't seem to be writing. Do I have to do something specific? Here's what I have. If I change the name of the pix_buffer_read buffer, the pd window spits out a stream of buffer not found errors, as one would expect. However, if I change the name of the pix_buffer_write buffer, nothing. So it looks to me like it's not doing anything at all. [pix_buffer video] [gemhead] | [pix_video] | [pix_buffer_write video] [gemhead] | [pix_buffer_read video] | [pix_texture] | [rectangle 4 3] -- * Pall Thayer artist http://www.this.is/pallit * -- * Pall Thayer artist http://www.this.is/pallit * ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] iemlib low pass filters exhibiting jitter?
I'm having the same problem. It's like a zipper noise that you can't avoid no matter what interpolation time you set. If you set it to 150 ms or above it works. But how can you have fast attacks like that? At the moment I am changing interpolation times after the initial attack time of the envelope generator. So I got rid of most of it. But still some noise during the attack period. Moog filter has audio ins. That one works a lot better but has a rather fixed, predefined (but good) sound. Ingo -Ursprüngliche Nachricht- Von: pd-list-boun...@iem.at [mailto:pd-list-boun...@iem.at] Im Auftrag von Luka Princic // Nova deViator Gesendet: Mittwoch, 2. März 2011 17:26 An: pd-list@iem.at Betreff: [PD] iemlib low pass filters exhibiting jitter? hi, just a quick question, is it normal or somewhat on purpose that all versions of low pass filters in iemlib (from lp2 - lp10 and cheb, butt, bess and crit) exhibit slight high pitched jitter when cutoff frequency is being dynamicly changed? is it a nature of such filter or just a type of implementation that somewhat doesn't take care of interpolation (if interpolation is a problem at all)? any thoughts welcome... is there a way i could avoid that jitter with these filters? is there some other high-pole low pass filter in some other library i could use? sure, i can always use series of [lop~] .. best, luka -- sujet est machinique! Nova deViator ¤ http://deviator.si ¤ http://skylined.org ¤ ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] iemlib low pass filters exhibiting jitter?
Le 02/03/2011 20:33, Ingo a écrit : I'm having the same problem. It's like a zipper noise that you can't avoid no matter what interpolation time you set. If you set it to 150 ms or above it works. But how can you have fast attacks like that? At the moment I am changing interpolation times after the initial attack time of the envelope generator. So I got rid of most of it. But still some noise during the attack period. Moog filter has audio ins. the biquad object from nusmuk audio (bq~) does also have audio inlet for filter coef. since it's a biquad, you can shape your filter... c That one works a lot better but has a rather fixed, predefined (but good) sound. Ingo -Ursprüngliche Nachricht- Von: pd-list-boun...@iem.at [mailto:pd-list-boun...@iem.at] Im Auftrag von Luka Princic // Nova deViator Gesendet: Mittwoch, 2. März 2011 17:26 An: pd-list@iem.at Betreff: [PD] iemlib low pass filters exhibiting jitter? hi, just a quick question, is it normal or somewhat on purpose that all versions of low pass filters in iemlib (from lp2 - lp10 and cheb, butt, bess and crit) exhibit slight high pitched jitter when cutoff frequency is being dynamicly changed? is it a nature of such filter or just a type of implementation that somewhat doesn't take care of interpolation (if interpolation is a problem at all)? any thoughts welcome... is there a way i could avoid that jitter with these filters? is there some other high-pole low pass filter in some other library i could use? sure, i can always use series of [lop~] .. best, luka -- sujet est machinique! Nova deViator ¤ http://deviator.si ¤ http://skylined.org ¤ ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] [PD-announce] Doctoral student (2 positions) in Aalto University School of Art and Design
This is related to my previous email. I just noticed this call for doctoral students. This is a paid position. Deadline is Tuesday 29 of March 2011. http://www.aalto.fi/en/current/jobs/teaching_and_research/tohtorikoulutettava/ Key Qualifications: - The doctoral student must have a Master’s degree and possess a post-graduate study place in a University. - The research plan must be related to the research fields of the School of Art and Design. (here, the research group that I previously announced might be of interest to some of you - site is under construction - http://sopi.media.taik.fi ) - The research plan must include a schedule to take the doctoral degree. you can contact me directly if you have any questions about this call. Best, Koray - M.Koray Tahiroğlu Media Lab, Aalto University, School of Art and Design http://sopi.media.taik.fi http://mlab.taik.fi/~korayt tel: +358 45 233 6272 ___ Pd-announce mailing list pd-annou...@iem.at http://lists.puredata.info/listinfo/pd-announce ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] To divide a number in random parts
Hey guys, long time since I posted here. I've been trying to think a way to divide a number into random parts. Let me explain myself better: I'm writing a piece where I want 10 chords played during 48 seconds but the duration of each chord should be different. So I'm trying to figure out a way to divide 48 into 10 unequal parts, I think using random numbers should be the best way but the difficulty is to get 10 random numbers wich summed give 48. Since I'm not expert at math maybe someone can help me. I want to do this operation with other numbers, therefore a pd patch would be great. ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] To divide a number in random parts
On Wed, 2 Mar 2011, Caio Barros wrote: I'm writing a piece where I want 10 chords played during 48 seconds but the duration of each chord should be different. So I'm trying to figure out a way to divide 48 into 10 unequal parts, I think using random numbers should be the best way but the difficulty is to get 10 random numbers wich summed give 48. Since I'm not expert at math maybe someone can help me. I want to do this operation with other numbers, therefore a pd patch would be great. Should those numbers be _all_ different ? Note that if you sum 1+2+3+4+5+6+7+8+9+10, that's already 55. How many time units do you have per 48 seconds ? (do you have a base tempo at all ?) And then what do you want the distribution to be like ? Is there any maximum duration of a chord, minimum duration of a chord, etc ? ___ | Mathieu Bouchard tél: +1.514.383.3801 Villeray, Montréal, QC ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] To divide a number in random parts
2011/3/3 Caio Barros caio.bar...@gmail.com Hey guys, long time since I posted here. I've been trying to think a way to divide a number into random parts. Let me explain myself better: I'm writing a piece where I want 10 chords played during 48 seconds but the duration of each chord should be different. So I'm trying to figure out a way to divide 48 into 10 unequal parts, I think using random numbers should be the best way but the difficulty is to get 10 random numbers wich summed give 48. take n random numbers and sum them (n1+n2+n3+...=sum) divide 48 by that sum (48/sum=x) multiply each of your n random numbers by x and sum that to get 48 (n1*x + n2*x + n3*x +...=48) gr, Tim Since I'm not expert at math maybe someone can help me. I want to do this operation with other numbers, therefore a pd patch would be great. ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
