diff options
Diffstat (limited to 'pd/doc/3.audio.examples/45.envelope.follower.pd')
-rw-r--r-- | pd/doc/3.audio.examples/45.envelope.follower.pd | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/pd/doc/3.audio.examples/45.envelope.follower.pd b/pd/doc/3.audio.examples/45.envelope.follower.pd deleted file mode 100644 index 0c3de2b4..00000000 --- a/pd/doc/3.audio.examples/45.envelope.follower.pd +++ /dev/null @@ -1,101 +0,0 @@ -#N canvas 64 77 982 581 12; -#X text 759 566 updated for Pd version 0.26; -#X text 67 8 ENVELOPE FOLLOWERS; -#X text 17 28 The env~ object reports ths RMS signal level over the last 256 samples (by default) or any other power of 2 that's at least twice the block size. The analysis is done in an overlapped fashion so that results appear every N/2 points if N is the analysis window size. So the larger the window \, the stabler the result and the less frequently it appears. Computation time doesn't depend heavily on N.; -#X text 471 28 Envelope followers are frequently used to detect attacks and periods of silence. (There are fancier attack detectors out there \, though.) Here is a simple threshold-based attack and rest detector.; -#X obj 152 160 dbtorms; -#X floatatom 75 142; -#X obj 75 165 osc~ 440; -#X obj 75 188 *~ 0; -#X obj 75 211 env~; -#X floatatom 136 216; -#X floatatom 152 137; -#X msg 219 155 \; pd dsp 1; -#X obj 87 307 t b f; -#X floatatom 87 330; -#X obj 94 385 pack; -#X text 198 215 note 3.01 dB difference between peak and RMS amplitudes.; -#X obj 94 408 route 0 1; -#X obj 94 431 > 55; -#X obj 139 433 < 45; -#X obj 94 454 sel 1; -#X obj 139 456 sel 1; -#X msg 16 494 1; -#X msg 45 494 0; -#X obj 94 494 print attack; -#X obj 87 365 != 0; -#X obj 517 267 t b f; -#X floatatom 517 290; -#X obj 524 348 pack; -#X obj 524 371 route 0 1; -#X obj 524 404 sel 1; -#X msg 458 525 1; -#X msg 488 525 0; -#X obj 517 326 != 0; -#X obj 547 290 < 45; -#X obj 542 441 timer; -#X obj 600 371 sel 0; -#X obj 616 496 sel 0; -#X obj 542 487 sel 1; -#X obj 542 528 print rest; -#X obj 542 464 > 1000; -#X text 125 330 state -- 1 if waiting for low threshold \,; -#X text 151 345 0 if we've attained it and now want the; -#X text 180 359 high one.; -#X text 165 408 route the RMS value according to state; -#X text 191 435 if off \, 55 dB means attack. If on \, 45; -#X text 192 456 dB or less means state changes to off.; -#X text 106 279 ATTACK DETECTION; -#X text 515 244 REST DETECTION; -#X text 590 288 Here we always will test RMS against a low value; -#X text 615 305 but as before we route the result according to; -#X text 637 322 our state \, 1 if "resting" \, 0 if not.; -#X text 645 368 regardless of state \, when RMS isn't low; -#X text 667 383 reset the timer; -#X text 691 511 RMS isn't low enough.; -#X text 602 403 If we're not in rest \, and the RMS is low \,; -#X text 626 419 check elapsed time sinse RMS last wasn't low.; -#X text 613 461 If more than 1 second \, report a rest.; -#X text 664 495 If we're at rest \, pop out of it when; -#X text 471 94 Both detectors are state machines with two states \, on and off. If on \, a test is run to determine whether to turn off \, and vice versa. The tests are run at each output of the rms~ object.; -#X connect 4 0 7 1; -#X connect 5 0 6 0; -#X connect 6 0 7 0; -#X connect 7 0 8 0; -#X connect 8 0 9 0; -#X connect 8 0 12 0; -#X connect 8 0 25 0; -#X connect 10 0 4 0; -#X connect 10 0 11 0; -#X connect 12 0 13 0; -#X connect 12 1 14 1; -#X connect 13 0 24 0; -#X connect 14 0 16 0; -#X connect 16 0 17 0; -#X connect 16 1 18 0; -#X connect 17 0 19 0; -#X connect 18 0 20 0; -#X connect 19 0 21 0; -#X connect 19 0 23 0; -#X connect 20 0 22 0; -#X connect 21 0 13 0; -#X connect 22 0 13 0; -#X connect 24 0 14 0; -#X connect 25 0 26 0; -#X connect 25 1 33 0; -#X connect 26 0 32 0; -#X connect 27 0 28 0; -#X connect 28 0 29 0; -#X connect 28 1 36 0; -#X connect 29 0 34 1; -#X connect 30 0 26 0; -#X connect 31 0 26 0; -#X connect 32 0 27 0; -#X connect 33 0 27 1; -#X connect 33 0 35 0; -#X connect 34 0 39 0; -#X connect 35 0 34 0; -#X connect 36 0 31 0; -#X connect 37 0 30 0; -#X connect 37 0 38 0; -#X connect 39 0 37 0; |