/usr/share/puredata/doc/3.audio.examples/H07.measure.spectrum.pd is in puredata-doc 0.46.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X text 12 41 In this example we use two cascaded bandpass filters
to troll for partials in Jonathan Harvey's famous bell sample.;
#X text 16 233 You can hear partials around 48 \, 51.3 \, 55 (faint!)
\, 57 (fainter!) \, 60 \, two beating partials around 65 \, 67 \, 69
\, 70.9 \, 71.75 \, 72.6 \, 74 \, 74.65 \, 75.6 \, 77 \, 81.2 \, 84.6
\, 86.5 \, and probably many more. There's also one down at 36 \, but
it's easier to see it on the meter than hear it.;
#X text 124 447 <-- center pitch;
#X text 120 463 (shift-drag to fine tune);
#X text 131 491 <-- center frequency;
#X text 138 520 <-- Q (filter selectivity);
#X obj 44 614 output~;
#X text 341 680 updated for Pd version 0.39;
#X text 14 82 Note that filters can give unexpected level changes.
The bp~ object is designed to have roughly unit gain at the pass band
\, so the higher you set "Q" the more amplitude is lost. You can correct
for this by pushing the output amplitude \, but be sure to remember
to reset the output amplitude before you reduce Q again. I set the
Q to 100 and the output amplitude to 110 or 120 (with the room gain
way down.) Then holding the shift key \, slowly drag the center pitch
upward listening for modes.;
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#X msg 53 361 read -resize ../sound/bell.aiff \$1;
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#X obj 45 346 phasor~;
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#X text 109 12 MEASURING SPECTRA USING BANDPASS FILTERS;
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