/usr/lib/pd/extra/Gem/pix_tIIR-help.pd is in gem 1:0.93.3-9build1.
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 452 8 GEM object;
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#X text 40 267 Inlets:;
#X text 39 372 Outlets:;
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#X text 18 226 Arguments:;
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#X text 453 60 Example:;
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#X obj 132 136 gemwin;
#X obj 67 89 outlet;
#X obj 67 10 inlet;
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#X msg 132 112 create \, 1;
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#X text 515 289 Create window:;
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#X obj 451 83 gemhead;
#X text 17 386 Outlet 1: gemlist;
#X text 24 281 Inlet 1: gemlist;
#X obj 451 292 square 3;
#X obj 451 270 pix_texture;
#X text 71 31 Class: pix object (timebased effect);
#X obj 451 151 pix_film;
#X obj 515 151 t f;
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-1;
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#X msg 85 179 open \$1;
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#X restore 464 131 pd open;
#X text 505 77 open a supported;
#X text 506 88 movie-clip;
#X text 523 114 macOS: quicktime;
#X text 516 104 windos: *.AVI;
#X text 523 124 linux: depends...;
#X text 50 12 Synopsis: [pix_tIIR];
#X text 29 57 Description: timebased IIR-filter;
#X text 64 237 list: <feedbackTaps-1> <feedforwardTaps-1>;
#X floatatom 464 218 3 0 1 2 fb0 - -;
#X floatatom 491 218 3 0 1 2 fb1 - -;
#X floatatom 517 218 3 0 1 2 fb2 - -;
#X floatatom 554 218 3 0 1 2 ff0 - -;
#X obj 451 238 pix_tIIR 2 1;
#X floatatom 581 218 3 0 1 2 ff1 - -;
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#X obj 254 258 outlet;
#X obj 304 258 outlet;
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1;
#X msg 477 182 set;
#X text 24 294 Inlet 1: message: set: overwrites the filter-buffers
with the next incoming image.;
#X text 24 323 Inlet 1: message: set 0: blanks the filter-buffers.
;
#X text 24 343 Inlet 2..(M+2): float: mth feedback-coefficient;
#X text 24 355 Inlet (M+2)..(N+M+2): float: nth feedforward-coefficient
;
#X text 37 189 w(n) = fb0 * x(n) + fb1 * w(n-1) + ... + fbN(n-M);
#X text 38 203 y(n) = ff1 * w(n) + ff2 * w(n-1) + ... + ffM(n-N);
#X text 11 161 The output y() will calculate from the input x() at
a time n as follows;
#X msg 517 183 set 0;
#X text 11 79 [pix_tIIR] is a time-based filter like [pix_motionblur]
\, [pix_biquad] or pd's [biquad~]. The filter has a feedback- and a
feedforward-section \, the length of each can be specified as arguments.
The objects will have an inlet for each feedback-coefficient and an
inlet for each feedforward-coefficient.;
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