Pd-list January 2012

pd-list@lists.iem.at

104 participants
158 discussions

[tabwrite4~], is it possible at all?
by katja 11 Jan '12

11 Jan '12

Hello, In order to build a variable speed sound-on-sound looper I was looking for an object that can write at fractional speed, analogous to the interpolated reading of [tabread4~]. Indeed I found C code for [tabwrite4~] in ggee/experimental, but a quick test revealed that it doesn't work properly. In a flash of optimism, I planned to rewrite the code, but soon stumbled upon questions. It seems to me that 4-point-interpolated writing would mean: write values to 4 indexes at a time, just like [tabread4~] reads from 4 indexes at a time. While writing 4 values, recently written values must be taken into account, not bluntly overwritten. So two existing values, x[n-2] and x[n-1], should be somehow integrated with new values, if the writing direction is positive. That should be a leaky integration. Imagine the write pointer doesn't move; the values should not build up then. But how much should it leak to get the right balance? Does anyone have knowledge of this? It would be cool to have [tabwrite4~] in Pd-extended. I'm prepared to spend time on it, if someone can assure me that the concept is viable at all. Katja

5 7

Crashing patch (after considerable stability), Consistent error
by james murray 10 Jan '12

10 Jan '12

So, I've got an older computer that I've been running a PD/GEM patch on for a number of years, and it's been consistently performing until recently when it began crashing once or twice a day. I seem to be getting the same sort of report from console and was wondering if anyone could shed some light on this while I try and sort this out. I keep getting this in every log for the most part, I can post more... nothing has been changed or updated recently, it's been kind of just a computer I have to test and run things on, so I'm confused to as where this new issue could be coming from.... Thread 13 Crashed: 0 ...pple.AppleIntermediateCodec 0x06c15cb8 get_band + 312 1 ...pple.AppleIntermediateCodec 0x06c0b6cc decoder_entry(void*) + 428 2 libSystem.B.dylib 0x9002b200 _pthread_body + 96 Thread 14 Crashed: 0 ...pple.AppleIntermediateCodec 0x06c15cb8 get_band + 312 1 ...pple.AppleIntermediateCodec 0x06c0b6cc decoder_entry(void*) + 428 2 libSystem.B.dylib 0x9002b200 _pthread_body + 96 Thread 14 crashed with PPC Thread State 64: srr0: 0x0000000006c15cb8 srr1: 0x100000000200f030 vrsave: 0x0000000080000000 cr: 0x44000048 xer: 0x0000000020000000 lr: 0x000000000000000a ctr: 0x00000000000000b4 r0: 0x0000000000000000 r1: 0x00000000f068cd40 r2: 0x000000000001000c r3: 0x0000000008a1a000 r4: 0x0000000000000020 r5: 0x00000000aec00000 r6: 0x000000000757b398 r7: 0x00000000ffff414f r8: 0x0000000000000001 r9: 0x000000000000000f r10: 0xffffffff0000bec1 r11: 0x00000000ffff414f r12: 0x00000000000caec0 r13: 0x0000000000000000 r14: 0x0000000000000000 r15: 0x0000000000000000 r16: 0x0000000000000000 r17: 0x0000000000000000 r18: 0x00000000ffff505b r19: 0x000000000000aec0 r20: 0x00000000000c0000 r21: 0x00000000f068cd80 r22: 0x0000000000000240 r23: 0x0000000000000000 r24: 0x000000000000000f r25: 0x00000000000c0000 r26: 0x0000000000000010 r27: 0x000000000757b380 r28: 0x0000000000000000 r29: 0x00000000000000c0 r30: 0x0000000000000020 r31: 0x0000000006c15ba0 thanks in advance, N

2 1

Running Pd on a tiny (and cheap) computer
by Pierre Massat 10 Jan '12

10 Jan '12

Hi list, This is a topic which has been discussed a few times here already, but since things seem to be moving pretty fast, I'm opening it again. I would like to have a very small computer running Pd that could be carried around more easily than current laptops. It also had to be powerful enough to run Pd in rt. I've been following the Raspberry Pi project for a few months, but their CPU is only running at 800 MHz, and i think it'd be difficult to get reasonable rt performances. There's also the Dream Plug ( http://www.plugcomputer.org/development-kits/dreamplug.html), which has a faster (though totally unknown to me) CPU. I have no idea if it would be hard to install Pd on these machines. Do you have any idea or suggestion? Also, do you know if there exist small (and cheap) displays that could be used with these computers? It makes no sense to me to buy a computer the size of a Arduino board if i need to carry a desktop display with it... Cheers! Pierre

4 4

my phase vocoder example implemented in polar form
by Alexandre Torres Porres 10 Jan '12

10 Jan '12

by the way folks, check this out... I did this Phase Vocoder implemented in Polar form. They say that the Polar Form is not that accurate and that it introduces artifacts as time goes by, because the phase difference is not as better calculated as in cartesian form. Well, I actually heard that, when loading files and playing them for a while. They start fine, but not that much well later on... I'm doing this examples as part of my workshops in Pd, I hope I have a nice thing to release here for you people in march the latest. Patch is virtually the same as Miller's cartesian form. Only that it is in Polar Form... (using cartopol~ and poltocar~). Also, it surely is considerably simplified, and hard coded for 2048 fft size, 4 overlaps and no rample rate correction. I took that much out put a looper thing in... Anyway, I've been bugging you folks about some Phase Vocoder questions. And you may as well check it with this example. One thing I noticed is that you don't need an accurate number in miliseconds to send to [line~] (which feeds [tabread4~]). The message box that goes to line is the last one in the furst subpatch |$1, $2 11.6< 11.6 is the hop size in miliseconds, and it is not the number that makes best sense anyway, and when I figured that I tried messing around. So check this out, you can put like 2 ms, and it still works! As for the ring buffer thread I started before, and ended up talking about the issue of making this loop perfectly. We'll, this is how I'm looping it, with [expr]. But the thing is that the counter is giving sample locations that are not perfectly in sync with the file size. So you can only check when you have already passed over its sie limit. And this is no good if you wanna have a perfectly looped file. I never actually needed to bother with that. But today it hit me that it is something worth dealing with. Just not sure yet. 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0.950002 0.950667 0.951331 0.951995 0.952643 0.95329 0.953937 0.954585 0.955215 0.955845 0.956475 0.957106 0.957718 0.958332 0.958945 0.959558 0.960153 0.960749 0.961345 0.96194 0.962519 0.963097 0.963675 0.964254 0.964814 0.965375 0.965936 0.966497 0.96704 0.967584 0.968127 0.96867 0.969196 0.969721 0.970247 0.970773 0.971281 0.971788 0.972296 0.972804 0.973294 0.973784 0.974275 0.974765 0.975237 0.975709 0.976181 0.976654 0.977108 0.977562 0.978016 0.978471 0.978907 0.979343 0.979779 0.980216 0.980634 0.981052 0.98147 0.981889 0.982289 0.982689 0.983089 0.983489 0.983871 0.984252 0.984634 0.985016 0.98538 0.985743 0.986107 0.98647 0.986816 0.987161 0.987506 0.987852 0.988178 0.988505 0.988832 0.989159 0.989468 0.989776 0.990085 0.990393 0.990683 0.990973 0.991263 0.991553 0.991825 0.992096 0.992368 0.992639 0.992892 0.993145 0.993398 0.993651 0.993885 0.99412 0.994354 0.994589 0.994804 0.99502 0.995236 0.995452 0.995649 0.995846 0.996043 0.99624 0.996418 0.996597 0.996775 0.996954 0.997113 0.997273 0.997433 0.997593 0.997734 0.997874 0.998016 0.998156 0.998279 0.998401 0.998523; #A 1000 0.998645 0.998749 0.998852 0.998956 0.999059 0.999144 0.999229 0.999313 0.999398 0.999464 0.99953 0.999595 0.999661 0.999708 0.999755 0.999802 0.999849 0.999878 0.999906 0.999934 0.999962 0.999972 0.999981 0.999991 1 0.999991 0.999981 0.999972 0.999962 0.999934 0.999906 0.999878 0.999849 0.999802 0.999755 0.999708 0.999661 0.999595 0.999529 0.999463 0.999398 0.999313 0.999228 0.999144 0.999059 0.998955 0.998852 0.998749 0.998645 0.998523 0.998401 0.998278 0.998156 0.998015 0.997874 0.997733 0.997592 0.997432 0.997273 0.997113 0.996953 0.996775 0.996596 0.996418 0.996239 0.996042 0.995845 0.995648 0.995451 0.995235 0.995019 0.994804 0.994588 0.994354 0.994119 0.993885 0.99365 0.993397 0.993144 0.992891 0.992638 0.992367 0.992095 0.991824 0.991552 0.991262 0.990972 0.990682 0.990392 0.990084 0.989775 0.989467 0.989158 0.988831 0.988504 0.988177 0.987851 0.987505 0.98716 0.986815 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0.919111 0.918266 0.917422 0.916578 0.915733 0.914873 0.914013 0.913153 0.912293 0.911417 0.910542 0.909666 0.908791 0.9079 0.907009 0.906118 0.905227 0.904321 0.903414 0.902508 0.901602 0.900681 0.899759 0.898838 0.897917 0.89698 0.896044 0.895108 0.894171 0.89322 0.892269 0.891318 0.890367 0.889401 0.888435 0.887469 0.886503 0.885523 0.884542 0.883562 0.882582 0.881587 0.880592 0.879597 0.878602 0.877593 0.876584 0.875575 0.874566 0.873543 0.87252 0.871497 0.870473 0.869436 0.868399 0.867362 0.866325 0.865274 0.864223 0.863172 0.862121 0.861057 0.859992 0.858928 0.857863 0.856785 0.855707 0.854629 0.853551 0.85246 0.851368 0.850277 0.849186 0.848081 0.846977 0.845872 0.844768 0.84365 0.842533 0.841416 0.840298 0.839168 0.838037 0.836907 0.835777 0.834634 0.833491 0.832348 0.831205 0.83005 0.828895 0.827739 0.826584 0.825416 0.824249 0.823081 0.821913 0.820733 0.819554 0.818374 0.817194 0.816002 0.814811 0.813619 0.812427 0.811224 0.81002 0.808817 0.807613 0.806398 0.805183 0.803968 0.802753 0.801526 0.8003 0.799073 0.797847 0.796609 0.795372 0.794134 0.792896 0.791647 0.790399 0.78915 0.787901 0.786642 0.785382 0.784123 0.782863 0.781593 0.780323 0.779052 0.777782 0.776502 0.775221 0.77394 0.77266 0.771369 0.770078 0.768787 0.767496 0.766195 0.764894 0.763593 0.762292 0.760981 0.75967 0.758359 0.757048 0.755728 0.754407 0.753087 0.751766 0.750436 0.749106 0.747776 0.746446 0.745107 0.743767 0.742428 0.741089 0.73974 0.738392 0.737044 0.735695 0.734338 0.732981 0.731623 0.730266 0.7289 0.727534 0.726168 0.724802 0.723428 0.722054 0.720679 0.719305 0.717922 0.71654 0.715157 0.713774 0.712384 0.710993 0.709602 0.708211 0.706813 0.705414 0.704016 0.702617 0.701211 0.699805 0.698399 0.696993 0.695579 0.694165 0.692752 0.691338 0.689917 0.688497 0.687076 0.685655 0.684227 0.6828 0.681372 0.679944 0.678509 0.677075 0.67564 0.674206 0.672765 0.671324 0.669882 0.668441 0.666994 0.665546 0.664099 0.662652 0.661198 0.659744 0.658291 0.656837 0.655378 0.653918 0.652459 0.650999 0.649534 0.648069 0.646604 0.645139 0.643668 0.642197 0.640727 0.639256 0.63778 0.636304 0.634828 0.633353 0.631872 0.630391 0.62891 0.627429 0.625943 0.624458 0.622972 0.621486 0.619996 0.618506 0.617015 0.615525 0.614031 0.612536 0.611041 0.609547 0.608048 0.606549 0.605051 0.603552 0.602049 0.600546 0.599044 0.597541 0.596035 0.594529 0.593022 0.591516 0.590006 0.588496 0.586987 0.585477 0.583964 0.582451 0.580938 0.579425 0.577909 0.576393 0.574877 0.573361 0.571842 0.570324 0.568805 0.567286 0.565765 0.564244 0.562723 0.561201 0.559678 0.558154 0.556631 0.555107 0.553581 0.552056 0.55053 0.549004 0.547477 0.545949 0.544422 0.542894 0.541365 0.539836 0.538307 0.536778 0.535248 0.533717 0.532187 0.530656 0.529124 0.527593 0.526061 0.52453 0.522997 0.521464 0.519932 0.518399 0.516866 0.515333 0.5138 0.512266 0.510733 0.509199 0.507665 0.506131 0.504598 0.503064 0.50153 0.499996 0.498462 0.496928 0.495394 0.49386 0.492326 0.490792 0.489259 0.487725 0.486192 0.484659 0.483125 0.481592 0.480059 0.478527 0.476994 0.475462 0.47393 0.472399 0.470867 0.469335 0.467805 0.466274 0.464744 0.463213 0.461684 0.460155 0.458626 0.457097 0.455569 0.454042 0.452514 0.450987 0.449461 0.447936 0.44641 0.444884 0.443361 0.441837 0.440314 0.43879 0.437269 0.435748 0.434226 0.432705 0.431186 0.429668 0.428149 0.42663 0.425114 0.423598 0.422082 0.420566 0.419053 0.417541 0.416028 0.414515 0.413005 0.411495 0.409985 0.408476 0.406969 0.405463 0.403957 0.40245 0.400948 0.399445 0.397942 0.39644 0.394941 0.393442 0.391944 0.390445 0.38895 0.387456 0.385961 0.384466 0.382976 0.381486 0.379996 0.378505 0.37702 0.375534 0.374048 0.372563 0.371082 0.369601 0.36812 0.366639 0.365163 0.363687 0.362212 0.360736 0.359265 0.357794 0.356324 0.354853 0.353388 0.351923 0.350458 0.348993 0.347533 0.346074 0.344614 0.343155 0.341701 0.340247 0.338794 0.33734 0.335893 0.334445 0.332998 0.331551 0.330109 0.328668 0.327227 0.325786 0.324352 0.322917 0.321483 0.320048 0.31862 0.317192 0.315765 0.314337 0.312916 0.311495 0.310075 0.308654 0.30724 0.305827 0.304413 0.302999 0.301593 0.300187 0.298781 0.297375 0.295976 0.294578 0.293179 0.291781 0.29039 0.288999 0.287609 0.286218 0.284835 0.283453 0.28207 0.280687 0.279313 0.277939 0.276564 0.27519 0.273824 0.272458 0.271092 0.269726 0.268369 0.267012 0.265654 0.264297 0.262949 0.2616 0.260252 0.258904 0.257564 0.256225 0.254886 0.253547 0.252217 0.250886 0.249556 0.248226 0.246906 0.245585 0.244265 0.242944 0.241633 0.240323 0.239012 0.237701 0.2364 0.235099 0.233798 0.232497 0.231206 0.229915 0.228624 0.227333 0.226053 0.224772 0.223491 0.222211 0.22094 0.21967 0.2184 0.21713 0.21587 0.214611 0.213351 0.212092 0.210843 0.209594 0.208346 0.207097 0.205859 0.204622 0.203384 0.202146 0.20092 0.199693 0.198467 0.19724 0.196025 0.19481 0.193595 0.19238 0.191177 0.189973 0.18877 0.187566 0.186374 0.185183 0.183991 0.182799 0.181619 0.18044 0.17926 0.17808 0.176913 0.175745 0.174577 0.17341 0.172254 0.171099 0.169943 0.168788 0.167645 0.166502 0.165359 0.164217 0.163086 0.161956 0.160826 0.159696 0.158578 0.157461 0.156343 0.155226 0.154121 0.153017 0.151912 0.150808 0.149717 0.148625 0.147534 0.146443 0.145365 0.144287 0.143209 0.142131 0.141066 0.140002 0.138937 0.137873 0.136822 0.135771 0.13472 0.133669 0.132632 0.131595 0.130558 0.129521 0.128498 0.127474 0.126451 0.125428 0.124419 0.12341 0.122401 0.121392 0.120397 0.119402 0.118408 0.117413 0.116432 0.115452 0.114472 0.113491 0.112525 0.11156 0.110594 0.109628 0.108677 0.107726 0.106775 0.105823 0.104887 0.103951 0.103014 0.102078 0.101157 0.100236 0.0993142 0.0983929 0.0974867 0.0965805 0.0956743 0.0947681 0.0938772 0.0929862 0.0920953 0.0912043 0.0903288 0.0894533 0.0885777 0.0877022 0.0868421 0.0859821 0.0851221 0.084262 0.0834177 0.0825733 0.0817289 0.0808845 0.080056 0.0792274 0.0783988 0.0775702 0.0767575 0.0759448 0.0751321 0.0743194 0.0735227 0.0727261 0.0719294 0.0711327 0.0703522 0.0695717 0.0687912 0.0680107 0.0672464 0.0664822 0.0657179 0.0649537 0.0642058 0.0634579 0.06271 0.0619622 0.0612308 0.0604994 0.059768 0.0590366 0.0583219 0.0576071 0.0568923 0.0561775 0.0554794 0.0547814 0.0540833 0.0533852 0.052704 0.0520227 0.0513414 0.0506602 0.0499958 0.0493315 0.0486672 0.0480028 0.0473555 0.0467082 0.0460609 0.0454136 0.0447834 0.0441532 0.0435229 0.0428927 0.0422797 0.0416667 0.0410537 0.0404407 0.039845 0.0392494 0.0386536 0.038058 0.0374796 0.0369014 0.0363231 0.0357448 0.0351839 0.0346231 0.0340623 0.0335014 0.0329582 0.0324149 0.0318717 0.0313284 0.0308028 0.0302772 0.0297516 0.0292259 0.0287181 0.0282102 0.0277023 0.0271944 0.0267043 0.0262142 0.0257241 0.025234 0.0247618 0.0242896 0.0238174 0.0233451 0.0228909 0.0224366 0.0219823 0.0215281 0.0210918 0.0206555 0.0202193 0.019783 0.0193648 0.0189467 0.0185285 0.0181103 0.0177103 0.0173103 0.0169102 0.0165102 0.0161284 0.0157465 0.0153647 0.0149829 0.0146193 0.0142557 0.0138922 0.0135286 0.0131833 0.0128381 0.0124928 0.0121476 0.0118207 0.0114938 0.0111669 0.01084 0.0105315 0.0102231 0.00991461 0.00960612 0.00931612 0.00902611 0.0087361 0.0084461 0.0081746 0.0079031 0.0076316 0.0073601 0.00710714 0.00685418 0.00660124 0.00634828 0.00611392 0.00587955 0.00564519; #A 2000 0.00541082 0.00519508 0.00497931 0.00476357 0.00454783 0.00435072 0.00415364 0.00395656 0.00375944 0.00358105 0.00340262 0.00322419 0.0030458 0.00288612 0.00272641 0.0025667 0.00240701 0.00226605 0.00212508 0.00198409 0.00184312 0.00172091 0.00159872 0.0014765 0.00135428 0.00125083 0.00114739 0.00104398 0.000940531 0.000855893 0.000771224 0.000686586 0.000601947 0.000536084 0.000470251 0.000404418 0.000338554 0.000291526 0.000244498 0.00019744 0.000150412 0.00012219 9.39965e-05 6.57737e-05 3.75509e-05 2.81632e-05 1.87755e-05 9.38773e-06; #X coords 0 1 2047 0 300 100 1; #X restore 76 78 graph; #N canvas 0 22 450 300 (subpatch) 0; #X array \$0-phase-accum 1024 float 0; #X coords 0 1 1023 -1 250 150 1; #X restore 97 238 graph; #X restore 232 413 pd fft-tables; #X obj 232 368 block~ 2048 4; #X obj -2 215 cnv 15 400 120 empty empty empty 20 12 0 14 -191407 -66577 0; #N canvas 1245 426 502 450 phase-acummulation 0; #X obj 171 186 cnv 15 210 90 empty empty empty 20 12 0 14 -233017 -66577 0; #X obj 22 46 inlet~; #X obj 143 46 inlet~; #X obj 82 46 inlet~; #X obj 202 46 inlet~; #X obj 146 359 outlet~; #X obj 206 359 outlet~; #X obj 143 133 cartopol~; #X obj 22 134 cartopol~; #X obj 204 198 -~; #X obj 204 242 +~; #X obj 145 300 poltocar~; #X obj 287 359 outlet~; #X obj 318 46 inlet~; #X text 166 22 front; #X text 52 17 back; #X text 302 22 Accumulated phase; #X text 245 202 phase difference; #X text 288 222 +; #X text 287 387 phase accumulation; #X text 236 244 "Accumulated phase"; #X text 178 392 to iFFT; #X connect 1 0 8 0; #X connect 2 0 7 0; #X connect 3 0 8 1; #X connect 4 0 7 1; #X connect 7 0 11 0; #X connect 7 1 9 0; #X connect 8 1 9 1; #X connect 9 0 10 0; #X connect 10 0 12 0; #X connect 10 0 11 1; #X connect 11 0 5 0; #X connect 11 1 6 0; #X connect 13 0 10 1; #X restore 23 259 pd phase-acummulation; #X obj 167 297 tabsend~ \$0-phase-accum; #X obj 167 228 tabreceive~ \$0-phase-accum; #N canvas 123 52 275 236 Front-FFT 0; #X obj 66 126 rfft~; #X obj 66 90 *~; #X obj 84 63 tabreceive~ \$0-hann; #X obj 66 33 inlet~; #X obj 44 174 outlet~; #X obj 104 174 outlet~; #X connect 0 0 4 0; #X connect 0 1 5 0; #X connect 1 0 0 0; #X connect 2 0 1 1; #X connect 3 0 1 0; #X restore 83 165 pd Front-FFT; #N canvas 107 326 308 238 Back-FFT 0; #X obj 66 136 rfft~; #X obj 66 90 *~; #X obj 84 63 tabreceive~ \$0-hann; #X obj 66 33 inlet~; #X obj 42 184 outlet~; #X obj 102 184 outlet~; #X connect 0 0 4 0; #X connect 0 1 5 0; #X connect 1 0 0 0; #X connect 2 0 1 1; #X connect 3 0 1 0; #X restore -18 164 pd Back-FFT; #X obj 43 364 rifft~; #X obj 43 424 *~; #X obj 61 399 tabreceive~ \$0-hann; #X obj 43 455 /~ 3072; #X connect 6 0 7 0; #X connect 7 0 15 0; #X connect 7 1 14 0; #X connect 11 0 16 0; #X connect 11 1 16 1; #X connect 11 2 12 0; #X connect 13 0 11 4; #X connect 14 0 11 2; #X connect 14 1 11 3; #X connect 15 0 11 0; #X connect 15 1 11 1; #X connect 16 0 17 0; #X connect 17 0 19 0; #X connect 18 0 17 1; #X connect 19 0 2 0; #X restore -299 36 pd Phase-Vocoder; #X obj -309 87 dac~; #X text -139 40 instructions \; - open/load sound file \; - play; #X connect 0 0 8 1; #X connect 1 0 8 0; #X connect 2 0 8 3; #X connect 3 0 8 4; #X connect 4 0 8 2; #X connect 8 0 11 0; #X connect 11 0 12 0; #X connect 11 0 12 1;

3 9

Re: [PD] ring buffer with an array
by Alexandre Torres Porres 10 Jan '12

10 Jan '12

Hi there, yeah, the way it was, I didn't see a way to not use [bang~], so I asked to see if there was something new for me. But then I just started working with buffers that are multiples of block size, which is fine. Check the Phase Vocoder harmonizer I shared over here. I made it that way. And you're right, [delwrite~] is the way out of this restrain. But the phase vocoder was designed without it, with that sample location counter, and I thought it had to be that way. But then I saw that in the pdmtl phase vocoder abstraction they're using delwrite~ instead of this counter! I just don't know yet how this new structure actually works like. I'd have to think for a while in order to adapt it with a delwrite~, or study the pdmtl patch a lot. I just didn't have the time and tried to do it without it. But I mentioned I should try and work on a new pvoc harmonizer with a delwrite~ later on. The thing is that I'm working with this "super phase vocoder", with every possibility, and not just a ring buffer. I also have a regular buffer for recording that loops, scrubs and everything. So I made this multiples of block size and I'm using [bang~]. I also load files into the buffer, as a sampler... So I also needed to design a loop function for these files, which I managed to pull off yesterday. Again, the normal way would be to use something like phasor~, but I had to stick with the counter. anyway, I do have to look into [delwrite~], it surely seems like a more elegant way to solve this problem than with the way I did it. But try this harmonizer I shared the other day. Thanks a lot. alex =========== Hi Alex On Sun, 2012-01-08 at 16:33 -0200, Alexandre Torres Porres wrote: > Hi folks, I'm trying to implement a ring buffer with a table for a sampler > patch based on an array. > > But I'm having the hardest time cause it always "clicks" when I start > writing back on the beginning of the array. > > I made this simple test attached below using metro. But I'm figuring the > flaw is because is not trivial at all to keep control data in sync with > audio blocks I see two flaws with the same cause in your patch. Both objects, [tabwrite~ ] and [tabplay~ ], execute the incoming messages at block boundaries. Thus, your patch suffers from the limitation that you intended to avoid by not using [bang~ ]. It does not matter whether you use [bang~ ] or not, either way you cannot start the [tabwrite~ ] recording between blocks. It's not possible with the current implementation to make it record exactly every 2000ms (unless 2000ms is an exact multiple of the block size). The same applies to [tabplay~]. It does not take into account the scheduling information of the incoming bang message and simply starts playing at the next block start. Because of above mentioned reasons I suggest to stick with [delwrite~ ] and [delread~ ]. [delwrite~ ] is exactly what you are asking for: a ring buffer. Is there a particular reason why you don't use those? Roman

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a phase vocoder pitch shifter harmonizer in real time
by Alexandre Torres Porres 10 Jan '12

10 Jan '12

Hi Folks, working with these phase vocoder stuff, I thought I'd try and do a simple shifter/harmonizer with it once and for all. The phase vocoder shifter I found in pdmtl doesn't work as a harmonizer, and the latency was pretty high and not constant, so I did this. It's all as a Vanila abstraction! I have 2 short buffers (arrays) and do crossfade between them, I got some phase issues trying out and building it, but they now seem reasonably fine. I just did this, so I should work more on it to make it more stable and robust. I'm sure there are some bugs around, and it's still very dirty and needs code cleaning. Maybe I should try and implement it with delay lines as in pdmtl, hmmm, I guess it'd be better, right? Hmm... Later on when I have the time... Anyway, this goes back to the Pd Shifting thread I started here a while ago. I really like the quality of the phase vocoder. Somehow I don't get interested so much on other techniques and such. Yes, I assume there are some advantages out there, so what exactly would I be missing? Well, Check this thing I did out, see what you think, let's talk some more about pitch shifting.... get it here: http://sites.google.com/site/porres/pvoc-shifter.zip I wish to officially release it along with some other tools I'm building for my PhD, soon to be over... by the way, I see this object is finally available http://www.katjaas.nl/pitchshift/pitchshift.html need to try it out. cheers alex

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Re: [PD] no pd?? WTF ????
by ydegoyon＠gmail.com 10 Jan '12

10 Jan '12

Chris McCormick wrote: > On 01/04/2012 03:36 PM, ydegoyon(a)gmail.com wrote: >> productivity? that's what we should hate... > > fuck yes! > > "i define success as not working, and i live like a king." (nofx) > hey chris, i'm droiding party, i see it as the major kewl thing in pd these past years sooo great .... keep the good work ... regards, sevy

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ring buffer with an array
by Alexandre Torres Porres 10 Jan '12

10 Jan '12

Hi folks, I'm trying to implement a ring buffer with a table for a sampler patch based on an array. But I'm having the hardest time cause it always "clicks" when I start writing back on the beginning of the array. I made this simple test attached below using metro. But I'm figuring the flaw is because is not trivial at all to keep control data in sync with audio blocks any hints or ideas? thanks ============================ #N canvas 727 343 619 425 10; #N canvas 0 0 450 300 (subpatch) 0; #X array sample 88200 float 2; #X coords 0 1 88199 -1 200 140 1; #X restore 261 172 graph; #X obj 82 188 tabwrite~ sample; #X obj 109 270 tabplay~ sample; #X obj 104 307 dac~; #X obj 99 240 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X obj 168 131 metro 2000; #X obj 53 124 adc~ 1; #X obj 189 172 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X obj 101 119 sel 0; #X msg 101 143 stop; #X obj 137 232 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X obj 168 57 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0 1; #X obj 168 78 t f f; #X connect 2 0 3 0; #X connect 2 0 3 1; #X connect 2 1 4 0; #X connect 4 0 2 0; #X connect 5 0 1 0; #X connect 5 0 7 0; #X connect 6 0 1 0; #X connect 8 0 9 0; #X connect 9 0 1 0; #X connect 10 0 2 0; #X connect 11 0 12 0; #X connect 12 0 5 0; #X connect 12 1 8 0;

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Pure Data Patching Circle Dublin Second Meet 28th January at 2pm
by Andrew mcgovern 09 Jan '12

09 Jan '12

Hi All! The second meet for the Pd Patching circle in Dublin is taking place on the 28th of January just off Baggot St at 2pm. If you need further details just pm me and I'll get back to you. Directionshttp://maps.google.com/maps?client=s...ed=0CB8Q8gEwAA Andy

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Pure Data Patching Circle Dublin Second Meet 28th January
by Andrew mcgovern 09 Jan '12

09 Jan '12

Hi All! The second meet for the Pd Patching circle in Dublin is taking place on the 28th of January just off Baggot St. If you need further details just pm me and I'll get back to you. Directionshttp://maps.google.com/maps?client=s...ed=0CB8Q8gEwAA Andy

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