/usr/share/puredata/doc/3.audio.examples/H09.ssb.modulation.pd is in puredata-doc 0.48.1-3.
This file is owned by root:root, with mode 0o644.
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#X obj 188 393 cos~;
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#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);
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#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 multiplier;
#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.;
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#X text 42 213 The "Hilbert~" object is an abstraction in pd/extra.
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