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https://github.com/cookiengineer/audacity
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27 lines
1.0 KiB
Common Lisp
27 lines
1.0 KiB
Common Lisp
;nyquist plug-in
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;version 1
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;type process
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;preview linear
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;categories "http://lv2plug.in/ns/lv2core/#FilterPlugin"
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;name "Notch Filter..."
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;action "Performing Notch Filter..."
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;author "Steve Daulton and Bill Wharrie"
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;copyright "Released under terms of the GNU General Public License version 2"
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;control freq "Frequency" real "Hz" 60 0 10000
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;control q "Q (higher value reduces width)" real "" 1 0.1 20
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;; notch.ny by Steve Daulton and Bill Wharrie, September 2010.
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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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;; (multichan-expand) provides legacy support for old versions of Audacity
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;; in which the (notch2) function only supports mono tracks.
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(cond
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((> freq (/ *sound-srate* 2.0))(format nil "Error:\nFrequency too high for track sample rate."))
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((< freq 0)(format nil "Error:\nNegative frequency is invalid."))
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((< q 0.01)(format nil "Error:\nWidth must be at least 0.01."))
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((= freq 0) (format nil "Nothing to be done."))
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(T (multichan-expand #'notch2 s freq q)))
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