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Diffstat (limited to 'pd/doc/3.audio.examples/H02.high-pass.pd')
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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 38 354 +~ 1; +#X obj 37 491 hip~ 5; +#X text 100 491 high-pass filter; +#X floatatom 86 450 5 0 0 0 - - -; +#X msg 86 380 0; +#X text 122 329 sinusoidal test signal; +#X text 83 354 add "DC"; +#X text 124 380 zero for no filtering; +#X msg 86 403 3; +#X text 121 404 3 (or so) to remove DC; +#X text 126 427 higher freqencies affect; +#X text 166 443 the audible part of; +#X text 166 459 the signal as well.; +#X obj 38 329 osc~ 220; +#X msg 86 426 220; +#X text 23 229 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 computed by a one-pole +\, one-zero high-pass filter. These are used so often that Pd provides +one in the "hip~" object.; +#X text 131 4 ONE-POLE \, ONE-ZERO HIGH-PASS FILTER; +#X obj 126 569 tabwrite~ H02-graph; +#X connect 2 0 26 0; +#X connect 3 0 2 0; +#X connect 9 0 10 0; +#X connect 10 0 0 0; +#X connect 10 0 0 1; +#X connect 10 0 26 0; +#X connect 12 0 10 1; +#X connect 13 0 12 0; +#X connect 17 0 12 0; +#X connect 22 0 9 0; +#X connect 23 0 12 0; |