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https://github.com/cookiengineer/audacity
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31 lines
1.0 KiB
Common Lisp
31 lines
1.0 KiB
Common Lisp
;nyquist plug-in
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;version 4
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;type process
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;preview linear
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;name "Notch Filter..."
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;action "Applying 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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;; notch.ny by Steve Daulton and Bill Wharrie, September 2010.
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;; Last updated August 2015.
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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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;control frequency "Frequency (Hz)" float-text "" 60 0 nil
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;control q "Q (higher value reduces width)" float-text "" 1 0.1 nil
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(cond
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((< frequency 0.1) "Frequency must be at least 0.1 Hz.")
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((>= frequency (/ *sound-srate* 2.0))
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(format nil "Error:~%~%Frequency (~a Hz) is too high for track sample rate.~%~%~
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Track sample rate is ~a Hz~%~
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Frequency must be less than ~a Hz."
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frequency
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*sound-srate*
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(/ *sound-srate* 2.0)))
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((< q 0.1) "Q must be at least 0.1.")
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(T (notch2 *track* frequency q)))
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