mirror of
https://github.com/cookiengineer/audacity
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37 lines
1.0 KiB
Common Lisp
37 lines
1.0 KiB
Common Lisp
;nyquist plug-in
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;version 3
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;type process
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;name "Spectral edit multi tool"
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;action "Calculating..."
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;control control-f0 "Low Frequency" real "" 4000 0 20000
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;control control-f1 "High Frequency" real "" 4000 0 20000
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(defun wet (sig)
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(cond
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((not (or *f0* *f1*)) (throw 'error-message "Please select frequencies"))
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((not *f0*) (highpass2 sig *f1*))
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((not *f1*) (lowpass2 sig *f0*))
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(t (if (= *f0* *f1*)
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(throw 'error-message "Band width is undefined")
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(let*
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((fc (sqrt (* *f0* *f1*)))
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(width (abs (- *f1* *f0*)))
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(q (/ fc width)))
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(notch2 sig fc q))))))
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(defun result (sig)
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(let*
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((tn (truncate len))
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(rate (snd-srate sig))
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(transition (truncate (* 0.01 rate)))
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(t1 (min transition (/ tn 2)))
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(t2 (max (- tn transition) (/ tn 2)))
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(breakpoints (list t1 1.0 t2 1.0 tn))
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(env (snd-pwl 0.0 rate breakpoints)))
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(sum (prod env (wet sig)) (prod (diff 1.0 env) sig))))
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(catch 'error-message
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(multichan-expand #'result s))
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