puredata-doc 0.47.1-3 / usr / share / puredata / doc / 3.audio.examples / G09.pitchshift.pd

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#X floatatom 19 87 0 0 0 0 - - -;
#X obj 82 358 *~;
#X obj 205 295 line~;
#X floatatom 237 112 0 0 0 0 - - -;
#X text 68 9 PITCH SHIFTER;
#X obj 205 269 pack 0 200;
#X obj 237 86 r window;
#X obj 19 61 r transpose;
#X obj 19 143 exp;
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#X obj 19 259 /;
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#X obj 314 365 line~;
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#X obj 82 384 +~;
#X obj 19 410 cos~;
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#X obj 19 466 +~;
#X obj 106 317 wrap~;
#X obj 251 360 *~;
#X obj 251 393 +~;
#X obj 188 420 cos~;
#X obj 188 447 *~;
#X msg 492 56 \; transpose 0 \; window 100 \; delay 0;
#X obj 492 30 loadbang;
#X obj 146 216 t b f;
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#X obj 106 290 +~ 0.5;
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#X obj 19 196 - 1;
#X obj 19 117 * 0.05776;
#X obj 19 222 * -1;
#X text 53 86 <-- transposition;
#X text 96 99 (halftones);
#X text 82 163 speed;
#X text 81 177 change;
#X text 281 111 <--window (msec);
#X text 54 252 tape head;
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#X text 153 538 sample loop for;
#X text 153 555 test signal;
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#X obj 393 199 symbol;
#X msg 392 228 read -resize \$1 array1;
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#X msg 161 64 \; readfile ../sound/bell.aiff;
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#X restore 264 11 pd test-input;
#X text 425 153 This is a classic rotating-tape-head style pitch shifter
using the vd~ variable delay object. Ther are two moving tape heads
\, each of which is loudest at the middle of its trajectory \, and
enveloped out at the moment it has to jump back (or forward) to start
another scratch. Most of the brain work is in computing how fast the
tape heads have to move to get the desired transposition.;
#X text 425 272 The "window size" is the total trajectory of the read
points in the delay line \, in milliseconds. The delay times are controlled
by a phasor~ object. The second delay time \, 180 degrees out of phase
from the first one \, is computed using the "wrap" object.;
#X text 423 362 The "window size" is the total trajectory of the read
points in the delay line \, in milliseconds. The delay times are controlled
by a phasor~ object. The second delay time \, 180 degrees out of phase
from the first one \, is computed using the "wrap" object.;
#X text 422 454 The cos~ objects compute the fadein and fadeout of
the two delay line outputs. They each traverse the positive half of
the cosine waveform (phase -0.25 to +0.25) over the time the phase
goes from one end to the other.;
#X obj 19 493 output~;
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#X text 689 534 updated for Pd version 0.37-1;
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#X text 314 240 (msec);
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#X text 55 265 rotation freq;
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