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

1 files changed, 330 insertions, 0 deletions

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;
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+#X obj 371 258 sel 0;
+#X obj 327 443 *~;
+#X obj 293 443 +~;
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+#X obj 240 219 t f f;
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+#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;
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+#X connect 26 0 6 1;
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+#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;
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+#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;
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+#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;
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+#X obj 19 74 unpack s f;
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+#X obj 19 184 soundfiler;
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+#X text 113 252 read a sample;
+#X obj 33 251 loadbang;
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+#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;
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+#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;
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+#X msg 75 304 0 \, \$1 \$2;
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+#X obj 75 182 metro 1000;
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+;
+#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;
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+#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;
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+#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).;
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