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#X restore 369 323 graph;
#X text 393 465 --- 0.02 sec ---;
#X text 24 31 Many synthesis algorithms and transformations can have
outputs with a zero-freqency component (commonly called DC for "direct
current"). These are inaudible and sometimes cause distortion in audio
output devices \, or when converting to fixed-point soundfile formats.
It is often desirable to filter an audio signal to remove its DC component.
;
#X text 23 147 The simplest way to do this is to use a one-pole low-pass
filter \, tuned to a low frequency such as 3 Hertz \, and to subtract
its output from the original. This difference is called a one-pole
\, one-zero high-pass filter \, and it is used so often that Pd provides
one in the "hip~" object.;
#X obj 26 270 +~ 1;
#X obj 25 407 hip~ 5;
#X text 88 407 high-pass filter;
#X floatatom 74 366 5 0 0 0 - - -;
#X msg 74 296 0;
#X text 110 245 sinusoidal test signal;
#X text 71 270 add "DC";
#X text 112 296 zero for no filtering;
#X msg 74 319 3;
#X text 109 320 3 (or so) to remove DC;
#X text 114 343 higher freqencies affect;
#X text 154 359 the audible part of;
#X text 154 375 the signal as well.;
#X obj 26 245 osc~ 220;
#X msg 74 342 220;
#X text 131 4 ONE-POLE \, ONE-ZERO HIGH-PASS FILTER;
#X obj 114 485 tabwrite~ H02-graph;
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