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
181 lines
8.3 KiB
Text
181 lines
8.3 KiB
Text
#N canvas 279 221 567 589 12;
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#N canvas 228 148 651 544 fft-analysis 0;
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#X obj 15 164 *~;
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#X obj 14 99 inlet~;
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#X obj 15 218 rfft~;
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#X obj 36 140 tabreceive~ \$0-hann;
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#X obj 14 306 *~;
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#X obj 56 306 *~;
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#X obj 15 356 sqrt~;
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#X obj 14 498 tabwrite~ \$0-magnitude;
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#X obj 23 386 loadbang;
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#X obj 23 470 metro 250;
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#X obj 23 449 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1
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;
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#X msg 31 411 \; pd dsp 1;
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#X obj 15 8 block~ 512;
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#X text 225 131 tabreceive~ outputs array contents \,;
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#X text 225 149 constantly \, every block. Here it's;
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#X text 223 169 used to get the Hann window to;
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#X text 225 187 multiply by the input.;
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#X text 120 7 block~ object does no computation but declares this;
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#X text 120 24 window to be operating at a different block size from
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;
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#X text 122 58 Fourier transform.;
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#X text 121 40 the parent window. This determines the size of the;
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#X text 76 99 The inlet~ automatically re-blocks to the new block size.
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;
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#X obj 15 332 +~;
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#X text 94 308 Take the magnitude by squaring real and imaginary part
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\, adding and taking square root.;
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#X text 110 424 periodically graph the output. It appears every 512
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samples (about 12 milliseconds) but we only update the graph 4 times
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per second. The graph is back on the main (parent) window.;
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#X text 82 215 forward real FFT. Like "fft~" \, but only one inlet
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(for the real part) and only the first half of the output signals are
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used. (The others are determined by symmetry: they're complex conjugates
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of the first half \, in reverse order.) This takes 1/2 the CPU time
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of "fft".;
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#X connect 0 0 2 0;
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#X connect 1 0 0 0;
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#X connect 2 0 4 0;
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#X connect 2 1 5 1;
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#X connect 3 0 0 1;
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#X connect 5 0 22 1;
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#X connect 6 0 7 0;
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#X connect 8 0 10 0;
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#X connect 8 0 11 0;
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#X connect 9 0 7 0;
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#X connect 10 0 9 0;
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#X connect 22 0 6 0;
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#X restore 26 289 pd fft-analysis;
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#N canvas 0 0 450 300 (subpatch) 0;
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#X array \$0-magnitude 256 float 0;
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#X coords 0 256 255 0 256 100 1;
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#X restore 287 208 graph;
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#X text 110 6 WINDOWING AND BLOCKING FOURIER TRANSFORMS;
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#X obj 25 264 osc~;
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#X floatatom 25 218 5 0 0 0 - - -;
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#X obj 25 240 * 10;
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#X text 305 559 updated for Pd version 0.39;
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#X text 445 186 magnitude;
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#X text 284 311 0;
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#X text 522 311 255;
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#X text 273 297 0;
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#X text 255 253 128;
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#X text 254 203 256;
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#N canvas 0 0 450 300 (subpatch) 0;
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0.990393 0.991553 0.992639 0.993651 0.994589 0.995452 0.99624 0.996954
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0.997593 0.998156 0.998645 0.999059 0.999398 0.999661 0.999849 0.999962
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1 0.999962 0.999849 0.999661 0.999398 0.999059 0.998645 0.998156 0.997592
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0.996953 0.996239 0.995451 0.994588 0.99365 0.992638 0.991552 0.990392
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0.00135431 0.000940561 0.000601947 0.000338584 0.000150442 3.75807e-05
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;
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#X coords 0 1 511 0 200 120 1;
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#X restore 278 401 graph;
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#X msg 156 415 0;
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#X obj 50 464 osc~;
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#X obj 50 416 samplerate~;
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#X obj 50 487 *~ -0.5;
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#X obj 50 510 +~ 0.5;
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#X obj 42 535 tabwrite~ \$0-hann;
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#X text 264 393 1;
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#X text 257 511 0;
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#X text 273 524 0;
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#X obj 50 440 / 512;
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#X obj 42 393 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
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-1;
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#X text 383 378 Hann window;
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#X text 98 462 period 512;
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#X text 40 368 recalculate Hann;
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#X text 75 383 window table;
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#X text 100 233 tens of Hz.;
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#X text 80 215 <- frequency \,;
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#X text 98 270 click here and;
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#X text 170 286 <- see;
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#X text 21 32 In this example we use a sub-patch ("pd fft-analysis")
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to re-block the Fourier transform to 512 points. The signal is multiplied
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by the Hann window function (which is just a raised cosine.) The magnitude
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\, which is computed in the sub-patch \, is graphed below in this window.
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The point at 255 corresponds to just below the Nyquist frequency. Phase
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isn't shown \, and unlike the previous patch we don't control the initial
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phase of the oscillator. (For fun \, try drawing other window functions
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with the mouse...);
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#X text 459 527 511;
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#X connect 3 0 0 0;
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#X connect 4 0 5 0;
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#X connect 5 0 3 0;
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#X connect 14 0 15 1;
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#X connect 15 0 17 0;
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#X connect 16 0 23 0;
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#X connect 17 0 18 0;
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#X connect 18 0 19 0;
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#X connect 23 0 15 0;
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#X connect 24 0 16 0;
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#X connect 24 0 14 0;
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#X connect 24 0 19 0;
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