/usr/share/puredata/doc/5.reference/lop~-help.pd is in puredata-core 0.48.1-3.
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 | #N canvas 390 359 625 364 12;
#X obj 75 228 env~;
#X floatatom 75 253 0 0 0 0 - - -;
#X floatatom 120 178 0 0 0 0 - - -;
#X obj 12 226 env~;
#X floatatom 12 252 0 0 0 0 - - -;
#X floatatom 12 107 0 0 0 0 - - -;
#X obj 74 6 lop~;
#X text 9 68 The left inlet is the incoming audio signal. The right
inlet is the cutoff frequency in Hz.;
#X obj 12 130 osc~ 100;
#X text 57 105 <-- scroll to change input frequency;
#X text 8 35 lop~ is a one-pole low pass filter with a specified rolloff
frequency.;
#X text 114 7 - one-pole low pass filter;
#X msg 75 154 clear;
#X text 119 153 <-- reinitialize internal state;
#X text 152 179 <-- set cutoff frequency;
#X obj 75 206 lop~ 5;
#X text 132 208 The filter is initialized to cut off frequencies above
5 Hz.;
#X text 12 271 Compare the strength of the original signal on the left
with that of the filtered signal on the right.;
#X text 115 227 env~ gives the amplitude of the signal in dB.;
#X text 8 310 see also:;
#X obj 87 309 hip~;
#X obj 132 309 bp~;
#X obj 169 309 vcf~;
#X text 364 322 updated for Pd version-0.38;
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