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Diffstat (limited to 'pd/doc/3.audio.examples/C01.nyquist.pd')
| -rw-r--r-- | pd/doc/3.audio.examples/C01.nyquist.pd | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/pd/doc/3.audio.examples/C01.nyquist.pd b/pd/doc/3.audio.examples/C01.nyquist.pd new file mode 100644 index 00000000..256da0e3 --- /dev/null +++ b/pd/doc/3.audio.examples/C01.nyquist.pd @@ -0,0 +1,102 @@ +#N canvas 601 188 580 659 12; +#N canvas 0 0 450 300 graph1 0; +#X array table24 259 float 1; +#A 0 -0.294693 0 0.294693 0.4 0.28948 0.10749 0.022875 0.0789655 0.181673 +0.218249 0.171348 0.115564 0.119192 0.169863 0.201356 0.178657 0.137857 +0.138353 0.188891 0.23571 0.22487 0.164534 0.115848 0.125265 0.176634 +0.214361 0.205655 0.169043 0.14204 0.134157 0.124033 0.0997798 0.0859507 +0.118173 0.195202 0.270956 0.301868 0.293569 0.285908 0.289835 0.256276 +0.128881 -0.0684912 -0.215994 -0.195335 -0.0145421 0.174701 0.203986 +0.0451069 -0.159794 -0.231026 -0.119011 0.0575033 0.135323 0.0628509 +-0.0665307 -0.124779 -0.0776696 0.000279083 0.0247376 -0.00546273 -0.0222151 +0.017933 0.0755681 0.0749102 4.97367e-06 -0.0729564 -0.0490464 0.0834901 +0.232853 0.286943 0.213202 0.0759584 -0.0357248 -0.0863297 -0.101697 +-0.115455 -0.125625 -0.107127 -0.0530433 0.012152 0.0608637 0.0902219 +0.111597 0.119683 0.0910146 0.0236817 -0.0326555 -0.0100379 0.100844 +0.216022 0.223032 0.094995 -0.0649958 -0.110291 0.00678482 0.180334 +0.247439 0.144699 -0.0319975 -0.124321 -0.0648335 0.0680811 0.141409 +0.100343 0.00354248 -0.0636733 -0.0891566 -0.131987 -0.227286 -0.316392 +-0.293048 -0.12222 0.100475 0.222686 0.173879 0.0281889 -0.0714016 +-0.0482686 0.0482418 0.108884 0.0773858 -0.00559103 -0.0590099 -0.0454391 +0.00509731 0.0411467 0.0421476 0.0225557 2.40108e-06 -0.0225508 -0.0421448 +-0.0411506 -0.00510821 0.0454302 0.0590142 0.0056084 -0.0773706 -0.108887 +-0.0482625 0.048252 0.0714103 -0.0281575 -0.173853 -0.222693 -0.100517 +0.122172 0.293026 0.316402 0.22731 0.132002 0.0891614 0.063682 -0.00352253 +-0.100324 -0.141412 -0.0681076 0.0648079 0.124324 0.0320316 -0.144663 +-0.247435 -0.180365 -0.00682225 0.110282 0.0650224 -0.0949583 -0.223017 +-0.216038 -0.100873 0.010022 0.0326611 -0.0236657 -0.0910033 -0.119682 +-0.111601 -0.0902271 -0.0608718 -0.0121649 0.0530291 0.107119 0.125625 +0.115458 0.101699 0.0863353 0.0357423 -0.0759289 -0.213176 -0.28694 +-0.232878 -0.0835252 0.0490278 0.0729642 1.4921e-05 -0.0749008 -0.0755765 +-0.0179463 0.0222127 0.00547055 -0.0247352 -0.000292052 0.0776522 0.12478 +0.0665546 -0.062824 -0.135322 -0.0575355 0.118973 0.23102 0.159828 +-0.0450604 -0.203969 -0.174729 0.014495 0.195309 0.21601 0.0685338 +-0.128843 -0.25626 -0.289835 -0.285909 -0.293565 -0.30187 -0.270969 +-0.195221 -0.118186 -0.0859518 -0.0997742 -0.124029 -0.134156 -0.142036 +-0.169035 -0.205649 -0.214364 -0.176646 -0.125273 -0.115843 -0.16452 +-0.22486 -0.235715 -0.188904 -0.13836 -0.137851 -0.178647 -0.201357 +-0.169874 -0.1192 -0.115557 -0.171333 -0.218246 -0.181691 -0.0789875 +-0.0228734 -0.107456 -0.289441 -0.399997 -0.294741 -7.20325e-05 0.294645 +; +#X coords 0 1.02 258 -1.02 258 130 1; +#X restore 93 408 graph; +#X obj 33 288 line~; +#X msg 33 237 500 \, 1423 4000; +#X floatatom 41 262 5 0 0 0 - - -; +#X text 24 556 Synthesis techniques vary in their tendency to make +foldover. For higher pitched sounds you'll want to try out relatively +folvover-resistant ones.; +#X obj 33 342 output~; +#X obj 201 281 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 +-1; +#N canvas 0 0 618 384 make-tab 0; +#X obj 13 28 inlet; +#X obj 99 28 inlet; +#X obj 183 28 inlet; +#X obj 255 29 inlet; +#X msg 38 176 \; table24 sinesum 256 1 1 1 1 0 0 0 0 1 0 0 0 0 0 0 +1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 1 \, normalize +0.4; +#X msg 14 277 \; table24 sinesum 256 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 \, normalize +0.2; +#X msg 183 101 \; table24 const 0 \, 0 1 1 1 1 1; +#X msg 255 58 \; table24 const 0; +#X connect 0 0 5 0; +#X connect 1 0 4 0; +#X connect 2 0 6 0; +#X connect 3 0 7 0; +#X restore 201 355 pd make-tab; +#X obj 232 300 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 +-1; +#X obj 263 317 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 +-1; +#X obj 295 334 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 +-1; +#X text 222 276 sine; +#X text 252 297 complex; +#X text 284 314 rectangle; +#X text 313 332 clear; +#X obj 33 315 tabosc4~ table24; +#X text 56 2 THE NYQUIST THEOREM AND FOLDOVER; +#X text 30 33 WARNING: PLAY THIS QUIETLY TO AVOID UNPLEASANTNESS AND +POSSIBLE EAR DAMAGE.; +#X text 29 77 Foldover occurs when you synthesize frequencies greater +than the Nyquist frequency (half the sample rate). In this example +\, the fundamental only reaches 1423 \, but the tables contain high +partials. As the partials sweep upward you hear them reflect off the +Nyquist frequency. Also \, partials can come into contact with each +other causing beating. The value of 1423 was chosen to make the beating +effect especially strong if you're running at a sample rate of 44100 +(the usual one.); +#X text 330 616 updated for Pd version 0.37; +#X text 219 245 waveforms:; +#X connect 1 0 15 0; +#X connect 2 0 1 0; +#X connect 3 0 1 0; +#X connect 6 0 7 0; +#X connect 8 0 7 1; +#X connect 9 0 7 2; +#X connect 10 0 7 3; +#X connect 15 0 5 0; +#X connect 15 0 5 1; |