[PD] my phase vocoder example implemented in polar form

Alexandre Torres Porres porres at gmail.com
Mon Jan 9 00:38:03 CET 2012


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.

Thanks
Alex

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#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;
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#X obj -2 215 cnv 15 400 120 empty empty empty 20 12 0 14 -191407 -66577
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#X obj 22 134 cartopol~;
#X obj 204 198 -~;
#X obj 204 242 +~;
#X obj 145 300 poltocar~;
#X obj 287 359 outlet~;
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#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;
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#X connect 4 0 7 1;
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#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;
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#X obj 66 126 rfft~;
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#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~;
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#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;
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