This file is indexed.

/usr/share/puredata/doc/3.audio.examples/E09.FM.spectrum.pd is in puredata-doc 0.47.1-3.

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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
#N canvas 127 136 697 536 12;
#X obj 94 188 *~;
#X obj 136 188 line~;
#X obj 18 179 cos~;
#X obj 18 154 +~;
#X obj 136 165 pack 0 50;
#X floatatom 136 117 0 0 0 0 - - -;
#X obj 136 141 / 100;
#X obj 18 129 phasor~;
#X obj 18 284 output~;
#X obj 17 253 hip~;
#X text 442 513 updated for Pd version 0.37;
#N canvas 122 211 558 609 fft 1;
#X obj 19 61 inlet~;
#X obj 208 212 inlet;
#X obj 29 92 rfft~;
#X obj 29 125 *~;
#X obj 60 125 *~;
#X obj 29 155 sqrt~;
#X obj 332 109 block~ 4096 1;
#X obj 29 181 biquad~ 0 0 0 0 1;
#X text 93 93 Fourier series;
#X text 98 146 magnitude;
#X text 96 131 calculate;
#X text 21 3 This subpatch computes the spectrum of the incoming signal
with a (rectangular windowed) FFT. FFTs aren't properly introduced
until much later.;
#X text 83 61 signal to analyze;
#X text 193 164 delay two samples;
#X text 191 182 for better graphing;
#X obj 19 459 samplerate~;
#X obj 19 436 bng 18 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X floatatom 19 506 5 0 0 0 - - -;
#X obj 19 482 / 256;
#X obj 19 412 loadbang;
#X obj 75 528 s fundamental;
#X text 17 359 At load time \, calculate a good choice of fundamental
frequency for showing spectra: the 16th bin in a 4096-point spectrum
\, so SR*16/4096 or SR/256.;
#X obj 231 259 metro 500;
#X obj 231 236 inlet;
#X text 284 234 toggle to graph repeatedly;
#X text 262 212 bang to graph once;
#X obj 19 295 tabwrite~ E09-signal;
#X obj 231 298 tabwrite~ E09-spectrum;
#X obj 19 528 t b f;
#X msg 19 551 \; cm 6;
#X text 25 585 set carrier multiplier after fundamental;
#X obj 29 205 /~ 4096;
#X msg 209 322 \; pd dsp 1;
#X connect 0 0 2 0;
#X connect 0 0 26 0;
#X connect 1 0 26 0;
#X connect 1 0 27 0;
#X connect 1 0 32 0;
#X connect 2 0 3 0;
#X connect 2 0 3 1;
#X connect 2 1 4 0;
#X connect 2 1 4 1;
#X connect 3 0 5 0;
#X connect 4 0 5 0;
#X connect 5 0 7 0;
#X connect 7 0 31 0;
#X connect 15 0 18 0;
#X connect 16 0 15 0;
#X connect 17 0 28 0;
#X connect 18 0 17 0;
#X connect 19 0 16 0;
#X connect 22 0 26 0;
#X connect 22 0 27 0;
#X connect 23 0 22 0;
#X connect 23 0 32 0;
#X connect 28 0 29 0;
#X connect 28 1 20 0;
#X connect 31 0 27 0;
#X restore 62 243 pd fft;
#X obj 122 222 bng 18 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 122 243 tgl 18 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X text 143 242 <-- repeatedly;
#X text 144 222 <-- graph once;
#N canvas 0 0 450 300 graph1 0;
#X array E09-signal 882 float 0;
#X coords 0 1.02 882 -1.02 200 80 1;
#X restore 433 28 graph;
#N canvas 0 0 450 300 graph1 0;
#X array E09-spectrum 259 float 0;
#X coords 0 0.51 258 -0.008 259 130 1;
#X restore 403 175 graph;
#X text 442 114 ---- 0.02 seconds ----;
#X text 433 306 2;
#X text 464 306 4;
#X text 403 306 0;
#X text 441 321 -- partial number --;
#X text 497 8 WAVEFORM;
#X text 497 157 SPECTRUM;
#X text 663 291 0;
#X text 664 173 0.5;
#X obj 93 117 osc~;
#X obj 93 86 r fundamental;
#X text 171 117 index (x100);
#X text 496 306 6;
#X text 529 306 8;
#X text 557 306 10;
#X text 589 306 12;
#X text 621 306 14;
#X text 43 3 SPECTRUM OF TWO-OPERATOR PHASE MODULATION;
#X floatatom 18 58 3 0 15 0 - - -;
#X obj 18 105 *;
#X obj 18 33 r cm;
#X text 52 57 carrier harmonic #;
#X text 71 367 This patch measures the spectrum of two-operator phase
modulation. The carrier frequency is initially six times the modulation
frequency \, but you can change it with the "carrier harmonic #" control.
Changing the index changes the relative strengths of the harmonics.
Past a certain index (which depends on the carrier frequency) the lower
sidebands begin to reflect about the left edge of the spectrum \, causing
complicated interference effects.;
#X connect 0 0 3 1;
#X connect 1 0 0 1;
#X connect 2 0 9 0;
#X connect 2 0 11 0;
#X connect 3 0 2 0;
#X connect 4 0 1 0;
#X connect 5 0 6 0;
#X connect 6 0 4 0;
#X connect 7 0 3 0;
#X connect 9 0 8 0;
#X connect 9 0 8 1;
#X connect 12 0 11 1;
#X connect 13 0 11 2;
#X connect 27 0 0 0;
#X connect 28 0 27 0;
#X connect 28 0 37 1;
#X connect 36 0 37 0;
#X connect 37 0 7 0;
#X connect 38 0 36 0;