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https://github.com/cookiengineer/audacity
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36 lines
1.2 KiB
Common Lisp
36 lines
1.2 KiB
Common Lisp
;nyquist plug-in
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;version 3
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;type process
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;categories "http://lv2plug.in/ns/lv2core#HighpassPlugin"
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;name "High Pass Filter..."
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;action "Performing High Pass Filter..."
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;; highpass.ny by Dominic Mazzoni
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;; Modified by David R. Sky
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;; Updated by Steve Daulton June 2012
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;; Released under terms of the GNU General Public License version 2:
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;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
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;; To enable the Q control, remove one semicolon from the start of lines 18 and 32
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;control rolloff "Rolloff (dB per octave)" choice " 6 dB,12 dB,24 dB,36 dB,48 dB" 0
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;;control q "Filter quality (Q) for 12 dB rolloff" real "" 0.7071 .1 20
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;control frequency "Cutoff frequency (Hz)" real "" 1000 1 20000
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(cond
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((> frequency (/ *sound-srate* 2))
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(format nil
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"Cutoff frequency is set at ~a Hz but must not~%~
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be greater than ~a Hz (half of the track sample rate)."
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frequency
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(truncate (/ *sound-srate* 2.0))))
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((<= frequency 1)
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(format nil
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"Cutoff frequency is set at ~a Hz~%but must be at least 1 Hz."
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frequency))
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; ((= rolloff 1)(highpass2 s frequency (max (min q 20) 0.1)))
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(T
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(funcall
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(nth rolloff '(hp highpass2 highpass4 highpass6 highpass8))
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s frequency)))
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