e85d191b46
- merge v0.01 --> Añadido fileselector - Añadidas fuentes de Gem y Pure Data - pix2jpg incluído en Gem. Archivos de construcción de Gem modificados. - Añadido fichero ompiling.txt con instrucciones de compilación
66 lines
2.5 KiB
Text
66 lines
2.5 KiB
Text
#N canvas 87 57 580 690 12;
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#X text 355 655 updated for Pd version 0.42;
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#X text 28 36 Pd is usually compiled to work on 32-bit audio samples.
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These do not \, in general \, have enough precision for use as indices
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into an array of more than about 32K samples. This is because the mantissa
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of a 23-bit floating point number has only 24 bits \, out of which
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you would be using 16 bits or more to address a sample more than 32K
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into the array \, so there would remain 8 or fewer bits to supply the
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fraction. In the most extreme situation possible \, the sample could
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contain a Nyquist frequency sinusoid and the output would then have
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only about 8 bits of accuracy!;
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#X text 29 196 You can use the "onset" inlet to tabread4~ to get good
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accuracy reading longer arrays. The tabread4~ object adds the index
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and the "main" (signal) inlet in 64-bit precision. So if \, for example
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\, the onset inlet could specify an integer exactly up to about 8 million
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(190 seconds at 44100 Hz) \, and the signal inlet could act as a displacement.
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;
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#X text 116 13 USING ONSETS INTO TABREAD4~ TO IMPROVE ACCURACY;
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#X obj 41 587 output~;
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#X obj 395 507 samplerate~;
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#X obj 395 531 / 2;
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#X obj 384 445 loadbang;
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#X obj 384 582 tabwrite~ \$0-tab;
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#X obj 40 557 tabread4~ \$0-tab;
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#X obj 395 555 osc~;
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#X obj 172 557 tabread4~ \$0-tab;
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#X obj 173 589 output~;
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#X obj 384 486 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144
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-1 -1;
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#X msg 408 468 \; pd dsp 1;
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#X obj 41 474 *~ 10000;
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#X obj 41 527 +~;
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#X floatatom 192 476 6 0 0 0 - - -;
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#X msg 247 446 1;
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#X obj 383 610 table \$0-tab 200000;
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#X obj 42 446 phasor~ 0.02;
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#X msg 192 446 150001;
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#X text 28 310 At left below an onset (1 or 150000 samples) is added
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to the index of a table lookup. If you select the onset of 150001 \,
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you should hear the truncation error. (The table contains a Nyquist
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signal and the "correct" output should be a 100 Hz. tone.) At right
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\, the onset is presented in the separate onset inlet. The worst-case
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truncation error drops by about 30 dB.;
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#X text 57 647 BAD;
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#X text 190 646 GOOD;
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#X text 193 425 ONSET INTO TABLE;
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#X text 384 426 This loads the table:;
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#X connect 5 0 6 0;
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#X connect 6 0 10 0;
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#X connect 7 0 13 0;
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#X connect 7 0 14 0;
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#X connect 9 0 4 0;
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#X connect 9 0 4 1;
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#X connect 10 0 8 0;
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#X connect 11 0 12 0;
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#X connect 11 0 12 1;
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#X connect 13 0 5 0;
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#X connect 13 0 8 0;
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#X connect 15 0 16 0;
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#X connect 15 0 11 0;
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#X connect 16 0 9 0;
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#X connect 17 0 11 1;
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#X connect 17 0 16 1;
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#X connect 18 0 17 0;
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#X connect 20 0 15 0;
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#X connect 21 0 17 0;
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