From 65a1b98552d7c6a93aedfb7c9b5d83f9038227cb Mon Sep 17 00:00:00 2001 From: Miller Puckette Date: Sat, 31 Dec 2005 00:59:49 +0000 Subject: Added about 64 files that I hadn't realized weren't in the CVS repository. Threw in pd/portaudio/pa_win_wdmks for good measure, although I haven't tried compiling that in yet (no windoze machine handy today). svn path=/trunk/; revision=4316 --- pd/doc/3.audio.examples/I04.noisegate.pd | 330 +++++++++++++++++++++++++++++++ 1 file changed, 330 insertions(+) create mode 100644 pd/doc/3.audio.examples/I04.noisegate.pd (limited to 'pd/doc/3.audio.examples/I04.noisegate.pd') diff --git a/pd/doc/3.audio.examples/I04.noisegate.pd b/pd/doc/3.audio.examples/I04.noisegate.pd new file mode 100644 index 00000000..0a8bd12a --- /dev/null +++ b/pd/doc/3.audio.examples/I04.noisegate.pd @@ -0,0 +1,330 @@ +#N canvas 42 28 657 564 12; +#X floatatom 316 376 0 0 0 0 - - -; +#X floatatom 81 384 0 0 100 0 - - -; +#N canvas 98 0 648 669 fft-analysis 0; +#X obj 35 589 *~; +#X obj 143 305 *~; +#X obj 158 150 *~; +#X obj 35 72 *~; +#X obj 76 527 *~; +#X obj 35 44 inlet~; +#X obj 35 528 *~; +#X obj 34 101 rfft~; +#X obj 35 558 rifft~; +#X obj 36 616 outlet~; +#X obj 119 149 *~; +#X obj 119 176 +~; +#X obj 165 278 r mask-level; +#X obj 100 422 /~; +#X obj 355 23 block~ 1024 4; +#X text 176 446 is signal power and "m" is mask.; +#X obj 131 332 -~; +#X obj 131 355 max~ 0; +#X obj 99 448 q8_sqrt~; +#X text 175 464 (zero if s < m).; +#X obj 144 256 tabreceive~ \$0-mask; +#X obj 76 72 tabreceive~ \$0-hann; +#X obj 69 590 tabreceive~ \$0-hann; +#N canvas 91 250 910 495 calculate-mask 0; +#X obj 125 379 inlet~; +#X msg 371 283 0; +#X msg 371 166 0; +#X obj 240 196 float; +#X obj 294 200 + 1; +#X obj 240 144 bang~; +#X obj 240 169 spigot; +#X floatatom 411 218 0 0 0 0 - - -; +#X obj 315 408 -~; +#X obj 371 258 sel 0; +#X obj 327 443 *~; +#X obj 293 443 +~; +#X floatatom 351 313 0 0 0 0 - - -; +#X obj 240 219 t f f; +#X obj 370 113 r make-mask; +#X obj 371 141 t b f; +#X obj 411 165 /; +#X text 483 212 number of; +#X text 491 227 frames; +#X floatatom 481 166 0 0 0 0 - - -; +#X obj 480 113 r window-msec; +#X obj 481 136 / 4; +#X text 521 133 hop size (analysis; +#X text 546 149 period) in msec; +#X obj 359 408 tabreceive~ \$0-mask; +#X obj 292 468 tabsend~ \$0-mask; +#X obj 371 218 <; +#X obj 235 258 expr 1/($f1+1); +#X text 134 17 calculate a mask using N msec of background noise; +#X text 43 354 current power (for each channel); +#X text 367 430 average the current power into the last mask to get +the new mask. The new value is weighted 1/n on the nth iteration.; +#X text 390 312 weight to average in new power to mask; +#X text 11 203 loop counting to desired; +#X text 78 219 number of frames; +#X text 72 39 This loops for "make-mask" milliseconds \, averaging +power in each channel over that amount of time. This is done by a moving +average whose weight is adjusted to average each new value equally +with each of the accumulating ones.; +#X connect 0 0 8 0; +#X connect 1 0 12 0; +#X connect 2 0 3 1; +#X connect 2 0 26 0; +#X connect 3 0 13 0; +#X connect 3 0 4 0; +#X connect 4 0 3 1; +#X connect 5 0 6 0; +#X connect 6 0 3 0; +#X connect 7 0 26 1; +#X connect 8 0 10 0; +#X connect 9 0 1 0; +#X connect 10 0 11 1; +#X connect 11 0 25 0; +#X connect 12 0 10 1; +#X connect 13 0 26 0; +#X connect 13 1 27 0; +#X connect 14 0 15 0; +#X connect 15 0 2 0; +#X connect 15 1 16 0; +#X connect 16 0 7 0; +#X connect 20 0 21 0; +#X connect 21 0 16 1; +#X connect 21 0 19 0; +#X connect 24 0 8 1; +#X connect 24 0 11 0; +#X connect 26 0 6 1; +#X connect 26 0 9 0; +#X connect 27 0 12 0; +#X restore 132 203 pd calculate-mask; +#X text 91 98 real Fourier transform; +#X obj 357 57 loadbang; +#X msg 357 80 \; pd dsp 1 \; window-size 1024; +#X text 193 355 ... but not less than zero; +#X text 101 561 real inverse Fourier transform; +#X text 196 498 normalize by 2/(3N) where N is window size; +#X text 168 332 current power ("s") minus level-adjusted mask ("m") +; +#X text 156 175 compute power (call it "s") in each channel; +#X obj 123 395 +~ 1e-20; +#X text 203 395 protect against division by zero; +#X text 179 426 compute sqrt((s-m)/s) where "s"; +#X text 296 204 <- subwindow calculates noise mask; +#X obj 98 499 /~ 1536; +#X connect 0 0 9 0; +#X connect 1 0 16 1; +#X connect 2 0 11 1; +#X connect 3 0 7 0; +#X connect 4 0 8 1; +#X connect 5 0 3 0; +#X connect 6 0 8 0; +#X connect 7 0 6 0; +#X connect 7 0 10 0; +#X connect 7 0 10 1; +#X connect 7 1 4 0; +#X connect 7 1 2 0; +#X connect 7 1 2 1; +#X connect 8 0 0 0; +#X connect 10 0 11 0; +#X connect 11 0 16 0; +#X connect 11 0 23 0; +#X connect 11 0 32 0; +#X connect 12 0 1 1; +#X connect 13 0 18 0; +#X connect 16 0 17 0; +#X connect 17 0 13 0; +#X connect 18 0 36 0; +#X connect 20 0 1 0; +#X connect 21 0 3 1; +#X connect 22 0 0 1; +#X connect 25 0 26 0; +#X connect 32 0 13 1; +#X connect 36 0 6 1; +#X connect 36 0 4 1; +#X restore 80 441 pd fft-analysis; +#N canvas 0 110 565 454 hann-window 0; +#N canvas 0 0 450 300 graph1 0; +#X array \$0-hann 1024 float 0; +#X coords 0 1 1023 0 300 100 1; +#X restore 82 311 graph; +#X obj 378 165 osc~; +#X obj 378 190 *~ -0.5; +#X obj 378 214 +~ 0.5; +#X obj 331 247 tabwrite~ \$0-hann; +#X obj 37 88 r window-size; +#X obj 38 173 /; +#X obj 127 142 samplerate~; +#X obj 38 251 s window-sec; +#X obj 177 204 swap; +#X obj 177 228 /; +#X obj 177 252 s window-hz; +#X obj 49 201 * 1000; +#X obj 49 228 s window-msec; +#X obj 38 115 t f b f; +#X msg 173 92 resize \$1; +#X obj 173 116 s \$0-hann; +#X obj 330 105 r window-hz; +#X msg 382 130 0; +#X obj 330 131 t f b; +#X text 15 8 calculate Hann window table (variable window size) and +constants window-hz (fundamental frequency of analysis) \, window-sec +and window-msec (analysis window size in seconds and msec).; +#X connect 1 0 2 0; +#X connect 2 0 3 0; +#X connect 3 0 4 0; +#X connect 5 0 14 0; +#X connect 6 0 8 0; +#X connect 6 0 12 0; +#X connect 7 0 6 1; +#X connect 7 0 9 1; +#X connect 9 0 10 0; +#X connect 9 1 10 1; +#X connect 10 0 11 0; +#X connect 12 0 13 0; +#X connect 14 0 6 0; +#X connect 14 0 9 0; +#X connect 14 1 7 0; +#X connect 14 2 15 0; +#X connect 15 0 16 0; +#X connect 17 0 19 0; +#X connect 18 0 1 1; +#X connect 19 0 1 0; +#X connect 19 1 4 0; +#X connect 19 1 18 0; +#X restore 331 478 pd hann-window; +#X text 197 355 noise; +#N canvas 132 255 660 373 insample 0; +#N canvas 0 0 450 300 graph1 0; +#X array \$0-sample 155948 float 0; +#X coords 0 1 155947 -1 400 150 1; +#X restore 236 25 graph; +#X obj 19 23 r read-sample; +#X obj 19 74 unpack s f; +#X obj 116 74 s insamprate; +#X obj 19 184 soundfiler; +#X obj 19 208 s insamplength; +#X text 113 252 read a sample; +#X obj 33 251 loadbang; +#X obj 19 100 t s b; +#X obj 75 99 symbol \$0-sample; +#X obj 19 135 pack s s; +#X msg 19 160 read -resize \$1 \$2; +#X obj 74 46 44100; +#X msg 33 275 \; read-sample ../sound/bell.aiff; +#X msg 31 322 \; read-sample ../sound/voice.wav; +#X obj 19 47 t a b; +#X connect 1 0 15 0; +#X connect 2 0 8 0; +#X connect 2 1 3 0; +#X connect 4 0 5 0; +#X connect 7 0 13 0; +#X connect 8 0 10 0; +#X connect 8 1 9 0; +#X connect 9 0 10 1; +#X connect 10 0 11 0; +#X connect 11 0 4 0; +#X connect 12 0 3 0; +#X connect 15 0 2 0; +#X connect 15 1 12 0; +#X restore 331 456 pd insample; +#X obj 316 401 s mask-level; +#X floatatom 202 379 0 0 100 0 - - -; +#X text 317 325 on; +#X text 362 326 off; +#X text 317 309 masking; +#X text 290 5 DENOISER; +#X msg 361 349 0; +#N canvas 190 43 812 571 test-signal 0; +#X obj 75 328 line~; +#X obj 75 250 f; +#X obj 251 164 r insamprate; +#X obj 583 219 *~; +#X obj 76 442 *~; +#X obj 583 110 noise~; +#X obj 370 493 +~; +#X obj 98 415 dbtorms; +#X obj 605 193 dbtorms; +#X obj 98 390 inlet; +#X obj 605 169 inlet; +#X obj 371 541 outlet~; +#X obj 236 139 r insamplength; +#X msg 75 304 0 \, \$1 \$2; +#X obj 75 276 pack 0 0; +#X obj 236 248 /; +#X obj 251 190 * 0.001; +#X obj 251 219 t b f; +#X obj 370 516 hip~ 5; +#X obj 75 136 loadbang; +#X obj 75 182 metro 1000; +#X obj 583 135 bp~ 10000 3; +#X obj 75 161 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1 +; +#X text 270 247 sample duration \, msec; +#X text 126 84 looped sample playback; +#X obj 75 356 tabread4~ \$0-sample; +#X text 580 83 filtered noise; +#X text 105 15 TEST SIGNAL: looped sample plus noise. The inlets control +amplitude of each in dB.; +#X connect 0 0 25 0; +#X connect 1 0 14 0; +#X connect 2 0 16 0; +#X connect 3 0 6 1; +#X connect 4 0 6 0; +#X connect 5 0 21 0; +#X connect 6 0 18 0; +#X connect 7 0 4 1; +#X connect 8 0 3 1; +#X connect 9 0 7 0; +#X connect 10 0 8 0; +#X connect 12 0 1 1; +#X connect 12 0 15 0; +#X connect 13 0 0 0; +#X connect 14 0 13 0; +#X connect 15 0 14 1; +#X connect 15 0 20 1; +#X connect 16 0 17 0; +#X connect 17 0 15 0; +#X connect 17 1 15 1; +#X connect 18 0 11 0; +#X connect 19 0 22 0; +#X connect 20 0 1 0; +#X connect 21 0 3 0; +#X connect 22 0 20 0; +#X connect 25 0 4 0; +#X restore 81 409 pd test-signal; +#X text 69 357 sampler; +#X text 443 311 calculate noise mask; +#X obj 80 488 output~; +#X msg 462 338 \; make-mask 2000; +#X msg 316 348 15; +#N canvas 0 0 592 442 mask-table 0; +#N canvas 0 0 450 300 graph1 0; +#X array \$0-mask 512 float 0; +#X coords 0 500 511 0 400 300 1; +#X restore 110 76 graph; +#X text 25 14 This table ($0-mask) is the average power measured in +each channel of the spectrum \, presumed to represent the noise floor. +; +#X restore 331 500 pd mask-table; +#X text 80 322 amplitudes (dB); +#X text 68 26 This patch attempts to scrub the noise floor from a sample +in two steps. First using the "make-mask" message (which is caught +in the "fft-analysis" window) \, you estimate the background spectrum. +You would normally do this at a moment when only the background noise +is audible. Then \, turn on "masking" (to 15 by default \, but try +other values) and the patch will try to clean the background noise +out of a signal.; +#X text 67 149 For this demonstration \, you control the amplitudes +of a looping sample and a filtered noise source. Normally you'd hit +"calculate noise mask" with only hte noise turned on \, then turn both +the noise and the sampler on \, and also "masking" \, to see if the +patch can clean the noise out of the signal. Open the "fft-analysis" +window to see the algorithm \, or the "insample" window to change samples +\, or "mask-table" to see the current mask (the average signal power +of the noise to clean out of the signal).; +#X connect 0 0 6 0; +#X connect 1 0 13 0; +#X connect 2 0 16 0; +#X connect 2 0 16 1; +#X connect 7 0 13 1; +#X connect 12 0 0 0; +#X connect 13 0 2 0; +#X connect 18 0 0 0; -- cgit v1.2.1