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author | N.N. <matju@users.sourceforge.net> | 2010-01-05 22:49:36 +0000 |
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committer | N.N. <matju@users.sourceforge.net> | 2010-01-05 22:49:36 +0000 |
commit | 8dbec761cf858ea65900c8a094599857208d8c3a (patch) | |
tree | 3228c023f87f23a354da3b57fdc2afe5b7052032 /desiredata/doc/3.audio.examples/I01.Fourier.analysis.pd | |
parent | 529e59635598e2d90a7a49f6b4c676f8366109ba (diff) |
svn path=/trunk/; revision=12907
Diffstat (limited to 'desiredata/doc/3.audio.examples/I01.Fourier.analysis.pd')
-rw-r--r-- | desiredata/doc/3.audio.examples/I01.Fourier.analysis.pd | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/desiredata/doc/3.audio.examples/I01.Fourier.analysis.pd b/desiredata/doc/3.audio.examples/I01.Fourier.analysis.pd deleted file mode 100644 index 31bcce63..00000000 --- a/desiredata/doc/3.audio.examples/I01.Fourier.analysis.pd +++ /dev/null @@ -1,90 +0,0 @@ -#N canvas 25 8 688 708 12; -#X floatatom 38 264 7 0 0 0 - - -; -#N canvas 0 0 450 300 graph1 0; -#X array \$0-real 64 float 2; -#X coords 0 64 64 -64 256 200 1; -#X restore 423 184 graph; -#X floatatom 38 168 5 0 32 0 - - -; -#X obj 78 240 samplerate~; -#X obj 38 215 t f b; -#X obj 38 240 *; -#X obj 80 568 metro 250; -#X obj 38 637 tabwrite~ \$0-real; -#X obj 67 614 tabwrite~ \$0-imaginary; -#X obj 38 384 osc~; -#N canvas 0 0 450 300 graph1 0; -#X array \$0-imaginary 64 float 2; -#X coords 0 64 64 -64 256 200 1; -#X restore 423 417 graph; -#X obj 69 360 f; -#X floatatom 91 316 3 0 100 0 - - -; -#X obj 91 337 / 100; -#X obj 38 191 / 64; -#X text 504 163 real part; -#X text 489 398 imaginary part; -#X obj 80 545 loadbang; -#X text 94 166 <- frequency; -#X text 133 182 (as multiple; -#X text 135 198 of SR/64 \, the; -#X text 133 215 fundamental); -#X text 170 345 of a cycle; -#X text 431 638 updated for PD version 0.39; -#X obj 89 590 s \$0-snap; -#X obj 69 286 r \$0-snap; -#X text 127 315 <- phase in; -#X text 161 331 hundredths; -#X text 113 264 <- frequency \, Hz.; -#X text 87 415 given the real and imaginary part; -#X text 88 431 of a complex-valued signal. Here; -#X text 87 447 the imaginary part is zero (the; -#X text 86 400 fft~ computes the Fourier transform \,; -#X text 186 541 real and imaginary; -#X text 186 557 outputs are graphed; -#X text 185 574 separately.; -#X text 86 464 input is real-valued). The output; -#X text 85 482 is a (real \, imaginary) pair for each; -#X text 86 500 frequency from 0 to 63 (in units of; -#X text 87 520 SR/64).; -#X text 145 -36 The "fft~" object has separate inlets for the real -and imaginary parts of a complex-valued signal and outputs its Fourier -transform \, again using separate outlets for the real and imaginary -part. The transform is done on one block of samples (here the block -size is 64 \, Pd's default.) The outputs give the complex amplitudes -of the harmonics of the input signal \, from DC up. The harmonics are -tuned to the fundamental frequency of the analysis \, 1/64th of the -sample rate. If the frequency (in harmonics) is an integer \, the result -is two harmonics symmetric about the Nyquist frequency. Fractional -frequencies spill across harmonics. Changing the initial phase rotates -energy from real to imaginary and back.; -#X text 26 -24 ANALYSIS; -#X text 27 -42 FOURIER; -#X msg 38 79 0; -#X msg 38 100 10; -#X msg 38 121 10.5; -#X text 159 283 bang-on-snapshot; -#X text 157 297 from below; -#X text 100 363 sync phase with snapshots; -#X obj 37 423 fft~; -#X msg 274 614 \; pd dsp 1; -#X connect 0 0 9 0; -#X connect 2 0 14 0; -#X connect 3 0 5 1; -#X connect 4 0 5 0; -#X connect 4 1 3 0; -#X connect 5 0 0 0; -#X connect 6 0 7 0; -#X connect 6 0 8 0; -#X connect 6 0 24 0; -#X connect 9 0 49 0; -#X connect 11 0 9 1; -#X connect 12 0 13 0; -#X connect 13 0 11 1; -#X connect 14 0 4 0; -#X connect 17 0 6 0; -#X connect 17 0 50 0; -#X connect 25 0 11 0; -#X connect 43 0 2 0; -#X connect 44 0 2 0; -#X connect 45 0 2 0; -#X connect 49 0 7 0; -#X connect 49 1 8 0; |