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authorN.N. <matju@users.sourceforge.net>2010-01-05 22:49:36 +0000
committerN.N. <matju@users.sourceforge.net>2010-01-05 22:49:36 +0000
commit8dbec761cf858ea65900c8a094599857208d8c3a (patch)
tree3228c023f87f23a354da3b57fdc2afe5b7052032 /desiredata/doc/3.audio.examples/I03.resynthesis.pd
parent529e59635598e2d90a7a49f6b4c676f8366109ba (diff)
svn path=/trunk/; revision=12907
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-#N canvas 265 48 643 640 fft-analysis 0;
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-#X obj 14 99 inlet~;
-#X obj 15 218 rfft~;
-#X obj 36 140 tabreceive~ \$0-hann;
-#X obj 14 353 *~;
-#X obj 56 353 *~;
-#X obj 15 8 block~ 512 4;
-#X text 85 88 The inlet~ now re-uses 3/4 of the previous block \, along
-with the 128 new samples.;
-#X text 221 141 window function as before.;
-#X obj 76 196 tabreceive~ \$0-gain;
-#X obj 77 225 *~;
-#X obj 16 506 *~;
-#X obj 37 481 tabreceive~ \$0-hann;
-#X obj 77 283 /~ 768;
-#X text 98 301 divide by 3N/2 (factor of N because rfft and rifft aren't
-normalized \, and 3/2 is the gain of overlap-4 reconstruction when
-Hann window function is applied twice.);
-#X text 120 216 Just to show we're doing something \, we multiply each
-channel by a gain controlled by an array in the main window. The control
-is quartic-scaled for easy editing.;
-#X obj 78 251 *~;
-#X text 92 357 Multiply the (complex-valued) spectrum amplitudes by
-the (real-valued) gain-and-normalization-factor;
-#X obj 15 399 rifft~;
-#X text 89 396 Real-valued inverse Fourier transform. This uses only
-the first N/@ points of its inputs \, supplying the rest by symmerty
-(so it's OK that rfft~ obly puts out those N/2 points.) There's only
-one outlet because the output is real-valued.;
-#X obj 16 566 outlet~;
-#X text 88 499 Multiply by the Hann window function again \, necessary
-because the operation we performed might result in a signal that doesn't
-go smoothly to zero at both ends.;
-#X text 89 566 This repackages the output into 64-sample chunks for
-the parent window. Since we're operating with an overlap \, the outlet~
-object performs an overlapped sum of the blocks computed in this window.
-;
-#X text 129 8 block~ object specifies vector size of 512 and overlap
-four. This window now computes blocks of 512 samples at intervals of
-128 samples computed on the parent patch.;
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-#X restore 26 289 pd fft-analysis;
-#X text 290 362 updated for Pd version 0.39;
-#N canvas 35 66 592 433 Hann-window 0;
-#N canvas 0 0 450 300 graph1 0;
-#X array \$0-hann 512 float 0;
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-#X text 336 221 Hann window;
-#X text 113 310 period 512;
-#X text 90 215 recalculate Hann;
-#X text 125 230 window table;
-#X obj 57 146 loadbang;
-#X msg 79 179 \; pd dsp 1;
-#X text 40 27 The Hann window is now recomputed on 'loadbang' to make
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-#X text 474 375 511;
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-#X text 138 0 FOURIER RESYNTHESIS;
-#X text 6 218 0;
-#X text 6 159 1;
-#X text 19 228 0;
-#X text 516 231 22K;
-#X text 270 261 <- reset gain;
-#X text 224 148 GAIN;
-#X text 21 24 Using Fourier resynthesis you can take an incoming sound
-\, operate on its spectrum \, and hear the result. Here we start with
-white noise and apply a frequency-dependent gain \, which works as
-a graphic equalizer. There are N/2 = 256 points \, each spaced SR/512
-Hz. apart (although their frequency ranges overlap). Open the "fft-analysis"
-patch to see the workings.;
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