Pd-list March 2005

pd-list@lists.iem.at

166 participants
274 discussions

more |vcf~| things
by julien.breval＠tremplin-utc.net 10 Mar '05

10 Mar '05

hello (still talking about the |vcf~| filter) as there doesn't seem to be any simple nor complex mathematical relationnship between Q, cutoff frequency and level factor (|*~|) for having a constant output level, I am now trying to find something empirical ... I made a table that gives the level factor you need to keep the same level when you change Q the source is a |noise~| and the amplitude is measured by |env~|, and 'f' refers to the required level factor, which was found empirically (and quickly) I attached the test patch some values for vcf~_cutoff=50 Hz: Q=0 -- f=1 Q=1 -- f=15 Q=2 -- f=20 Q=3 -- f=24.5 Q=4 -- f=28 Q=10 -- f=42 Q=20 -- f=60 Q=40 -- f=86 some values for vcf~_cutoff=12800 Hz: Q=0 -- f=1 Q=1 -- f=0.75 (see the remark2 below) Q=2 -- f=0.8 (see the remark2 below) Q=4 -- f=1.35 Q=20 -- f=3.4 Q=40 -- f=5 remark1: for a constant Q, multiplying the cutov by 2 adds +3 to the output value of |env~| (resp. dividing, -3) remark2: for Q=1 or Q=2 at 12800 Hz, the filter should normally not increase the volume of the signal like this ... maybe it's due to some software implementation contraints (?) also, do you think the method I used for measuring is correct ? any suggestion, idea, web link about this, etc will be appreciated a lot ... I will try to use a logarithmic-based compensation factor now cheers, -j

5 7

PD 4 DOS
by Beau Casey 10 Mar '05

10 Mar '05

Hi PD Programmers, Are there any versions of pd that will run from a dos prompt command line, without running windows in the back ground? I have an older laptop that would be fun to use, but the os takes ups too much cpu. http://www.cypod.co.nr

2 1

wha-wha object
by Oscar Kuroiwa 10 Mar '05

10 Mar '05

hi all im new in the pd list ;) Is there any wha-wha abstraction or wha-wha object in pd? Thanks Oscar Kuroiwa -- http://www.fastmail.fm - The way an email service should be

8 7

simple routing object
by hard off 10 Mar '05

10 Mar '05

what i want is a simple object. it has a left and right inlet, with the number of outlets defined by the creation argument. the left inlet is routed to outlet that corresponds to the value input to the right inlet. is there an external that does this? i am sick of using spigots and routes to do such an easy task.

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Re: [PD] error: inlet: no method for \'list\'
by thewade 10 Mar '05

10 Mar '05

> IOhannes m zmoelnig wrote: > >> thewade wrote: >> >> I want to have an inlet that takes both floats, symbols and lists of >> floats and or symbols. I should be able to do this by connecting an >> inlet to a [route 0 1 symbol list] for example, but when I use a >> message to send a list to this inlet from the outside I get: >> error: inlet: no method for \\\'list\\\' >> >> When I got this for symbol I just made another inlet and connected it >> to [symbol]. >> >> How do I fix this? >> > > [route float symbol list] > this _does_ work Indeed it does. That is not my problem. My problem is that the inlet of a subpatch gives me the afore mentioned trouble. Here is a link to a jpeg that might better explain my problem: http://www.aproximation.org/inletError.jpg Thanks for the help though! -thewade

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which codec does pdp_qt support?
by pun chik 10 Mar '05

10 Mar '05

i have lots of movs videos but pdp_qt cant read them... just a few ones. i tried convertirng avis to movs using sorenson and sorenson 4 codecs but didnt work. do anybody know this? this this this? : / ponchok -- pun chik punchik(a)fastmail.fm

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FTDI 232 /245 module
by slimboyfatboyslim 09 Mar '05

09 Mar '05

hi, Just wanna make a little survey before getting my hands dirty. Is there anyone at anytime working on FTDI 232 / 245 module (http://www.dontronics.com/giga.html#usbmod2) with PD? -- slimboyfatboyslim http://www.slimboyfatboyslim.org

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gem - pix_buffer strangeness (the patch)
by Thoralf Schulze 09 Mar '05

09 Mar '05

note to self: never forget the attachment again. never ever forget ... ___________________________________________________________ Gesendet von Yahoo! Mail - Jetzt mit 250MB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de

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Re: [PD] allpass filters?
by Michael Berkowski 09 Mar '05

09 Mar '05

Hi David, The cyclone library has an allpass~, but I find it easier just to use the attached abstraction. It's easily adaptible to single and double-nested allpass networks as well. It takes two arguments: 1) delay time in ms 2) feedback as float 0-1 I'm developing a sort of reverberation toolkit of unit reverberator abstractions and "classic" reverb implementations, which will include these. Best, Michael Berkowski michael_at_berkowski_dot_net http://www.berkowski.net/ filename: mb.allpass~.pd #N canvas 445 296 617 251 10; #X obj 211 -4 inlet~; #X text 258 -4 Main signal inlet; #X obj 369 43 f \$1; #X obj 369 -4 inlet; #X text 409 -7 Delay time; #X text 409 6 NOT VARIABLE; #X obj 3 201 outlet~; #X obj 515 -4 inlet; #X obj 515 43 f \$2; #X text 94 186 First argument is delay time \,; #X obj 225 16 s~ \$0-allpass_sig_in; #X obj 236 85 r~ \$0-allpass_sig_in; #X obj 369 62 s \$0-allpass_deltime; #X obj 3 1 r \$0-allpass_deltime; #X obj 236 118 +~; #X obj 211 62 *~; #X text 553 -3 Feedback; #X obj 102 62 *~; #X text 235 63 Feedforward Path; #X text 125 63 Feedback Path; #X text 93 157 This is a standard Allpass delay; #X text 95 168 with a feedback and feedforward path.; #X text 183 219 12.March.2004; #X obj 236 137 delwrite~ \$0-mb_allpass~ 150; #X obj 3 20 delread~ \$0-mb_allpass~ 72; #X obj 435 21 loadbang; #X obj 3 181 +~; #X obj 16 162 *~ -1; #X text 94 200 Second argument is Feedback gain (0-1).; #X obj 515 62 s \$0-gain; #X obj 115 41 r \$0-gain; #X obj 16 60 pow 2; #X obj 16 118 -; #X msg 16 99 1; #X obj 16 80 t b f; #X obj 3 138 *~; #X connect 0 0 10 0; #X connect 0 0 15 0; #X connect 2 0 12 0; #X connect 3 0 2 0; #X connect 7 0 8 0; #X connect 8 0 29 0; #X connect 11 0 14 0; #X connect 13 0 24 0; #X connect 14 0 23 0; #X connect 15 0 27 0; #X connect 17 0 14 1; #X connect 24 0 17 0; #X connect 24 0 35 0; #X connect 25 0 2 0; #X connect 25 0 8 0; #X connect 26 0 6 0; #X connect 27 0 26 1; #X connect 30 0 15 1; #X connect 30 0 17 1; #X connect 30 0 31 0; #X connect 31 0 34 0; #X connect 32 0 35 1; #X connect 33 0 32 0; #X connect 34 0 33 0; #X connect 34 1 32 1; #X connect 35 0 26 0; ---------------- >Message: 8 >From: "david golightly" <davigoli(a)hotmail.com> >To: pd-list(a)iem.at >Subject: [PD] allpass filters? >Date: Tue, 08 Mar 2005 21:00:09 -0500 > >Hello again List, > >I'm stumped here - does PD have any built-in allpass filter? If not, is >there an external out there that I should know about? Thanks! > >David

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Re: [PD] allpass filters?
by Julian Peterson 09 Mar '05

09 Mar '05

David-- Below is an abstraction I made for an allpass filter that is taken from the Roads Computer Music Tutorial... if you use it as an abstraction just name it something like allpass~.pd and use the following syntax: [allpass~ delay_length feedback_gain post_gain], Hope that helps! -Julian #N canvas 81 97 538 447 10; #X obj 112 48 inlet~; #X obj 112 261 +~; #X obj 112 292 delwrite~ \$0-allpass \$1; #X obj 218 95 delread~ \$0-allpass \$1; #X obj 218 123 *~ \$2; #X obj 403 94 loadbang; #X obj 403 141 t f f; #X obj 403 165 *; #X obj 403 189 expr 1-$f1; #X obj 218 225 *~; #X obj 218 255 +~; #X obj 440 117 f \$2; #X obj 444 141 * -1; #X obj 144 128 *~; #X obj 218 401 outlet~; #X obj 218 353 *~ \$3; #X text 31 17 [allpass~.pd delay(ms) feedback(mult) postgain]; #X obj 403 117 f \$2; #X connect 0 0 1 0; #X connect 0 0 13 0; #X connect 1 0 2 0; #X connect 3 0 4 0; #X connect 4 0 1 1; #X connect 4 0 9 0; #X connect 5 0 11 0; #X connect 5 0 17 0; #X connect 6 0 7 0; #X connect 6 1 7 1; #X connect 7 0 8 0; #X connect 8 0 9 1; #X connect 9 0 10 1; #X connect 10 0 15 0; #X connect 11 0 12 0; #X connect 12 0 13 1; #X connect 13 0 10 0; #X connect 15 0 14 0; #X connect 17 0 6 0; Message: 8 From: "david golightly" <davigoli(a)hotmail.com> To: pd-list(a)iem.at Subject: [PD] allpass filters? Date: Tue, 08 Mar 2005 21:00:09 -0500 Hello again List, I'm stumped here - does PD have any built-in allpass filter? If not, is there an external out there that I should know about? Thanks! David

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Pd-list March 2005