/usr/lib/puredata/doc/3.audio.examples/H09.ssb.modulation.pd is in puredata-doc 0.43.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | #N canvas 7 6 605 578 12;
#X obj 188 393 cos~;
#X obj 231 371 +~ -0.25;
#X obj 231 394 cos~;
#X obj 23 438 *~;
#X obj 89 438 *~;
#X obj 22 462 -~;
#X floatatom 188 322 5 0 0 0 - - -;
#X text 30 242 sample loop for;
#X text 30 260 test signal;
#X text 35 321 pair of allpass;
#X text 34 338 filters to make;
#X text 34 356 90 degree phase;
#X text 32 373 shifted versions;
#X text 238 323 <-- shift frequency;
#X text 310 356 cosine and sine waves;
#X text 55 7 SINGLE SIDEBAND MODULATION;
#X text 300 7 (AKA FREQUENCY SHIFTING);
#N canvas 555 154 448 326 bell-loop 0;
#X obj 23 142 /;
#X obj 23 214 +~ 1;
#X msg 23 117 44100;
#X obj 23 91 t b f;
#X obj 24 264 outlet~;
#N canvas 0 0 450 300 graph1 0;
#X array \$0-array 155948 float 0;
#X coords 0 1 155947 -1 200 150 1;
#X restore 234 88 graph;
#X obj 23 67 r \$0-totsamps;
#X obj 65 190 r \$0-totsamps;
#X obj 23 190 *~;
#X obj 23 166 phasor~;
#X obj 23 238 tabread4~ \$0-array;
#X connect 0 0 9 0;
#X connect 1 0 10 0;
#X connect 2 0 0 0;
#X connect 3 0 2 0;
#X connect 3 1 0 1;
#X connect 6 0 3 0;
#X connect 7 0 8 1;
#X connect 8 0 1 0;
#X connect 9 0 8 0;
#X connect 10 0 4 0;
#X restore 24 279 pd bell-loop;
#N canvas 711 110 483 471 startup 0;
#X obj 53 335 r readfile;
#X obj 53 388 soundfiler;
#X obj 59 23 loadbang;
#X obj 59 49 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 59 70 f \$0;
#X obj 60 271 /;
#X msg 60 248 44100;
#X obj 60 223 t b f;
#X obj 60 199 r \$0-totsamps;
#X obj 60 294 s \$0-loopf;
#X msg 53 361 read -resize ../sound/bell.aiff \$1;
#X msg 59 102 \; readfile symbol \$1-array \; \$1-totsamps 143718;
#X connect 0 0 10 0;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 4 0 11 0;
#X connect 5 0 9 0;
#X connect 6 0 5 0;
#X connect 7 0 6 0;
#X connect 7 1 5 1;
#X connect 8 0 7 0;
#X connect 10 0 1 0;
#X restore 157 530 pd startup;
#X obj 21 495 output~;
#X text 352 547 updated for Pd version 0.39;
#X obj 188 347 phasor~;
#X text 123 438 <-- complex multipier;
#X text 122 455 (calculates real part);
#X text 309 371 to form the real and;
#X text 309 387 imaginary part of a;
#X text 309 404 complex sinusoid;
#X text 43 37 The signal sideband modulator gives you only one sideband
for each frequency in the input signal (whereas ring modulation gave
both a positive and negative sideband). You can set the shift frequency
positive to shift all frequencies upward \, or negative to shift them
downwards.;
#X text 42 117 The technique is to filter the input into two versions
\, 90 degrees out of phase \, which can be interpreted as the real
and imaginary part of a complex signal with positive frequencies only.
You can then form the (complex) product of this with a (complex) sinusoid
to modulate upward or downward in frequency.;
#X obj 23 400 hilbert~;
#X text 42 213 The "Hilbert~" object is an abstraction in pd/extra.
;
#X connect 0 0 3 1;
#X connect 1 0 2 0;
#X connect 2 0 4 1;
#X connect 3 0 5 0;
#X connect 4 0 5 1;
#X connect 5 0 19 0;
#X connect 5 0 19 1;
#X connect 6 0 21 0;
#X connect 17 0 29 0;
#X connect 21 0 1 0;
#X connect 21 0 0 0;
#X connect 29 0 3 0;
#X connect 29 1 4 0;
|