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https://github.com/cookiengineer/audacity
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32 lines
1006 B
Common Lisp
32 lines
1006 B
Common Lisp
;nyquist plug-in
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;version 3
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;type process
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;name "Spectral edit parametric EQ..."
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;action "Calculating..."
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;control control-gain "Gain (dB)" real "" 0 -24 24
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(defun wet (sig gain)
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(cond
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((not (or *f0* *f1*)) (throw 'debug-message "Please select frequencies"))
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((not *f0*) (throw 'debug-message "Bottom frequency is undefined"))
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((not *f1*) (throw 'debug-message "Top frequency is undefined"))
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(t (let*
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((fc (sqrt (* *f0* *f1*)))
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(width-octaves (/ (s-log (/ *f1* *f0*)) (s-log 2.0))))
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(eq-band sig fc gain (/ width-octaves 2))))))
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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 control-gain)) (prod (diff 1.0 env) sig))))
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(catch 'debug-message
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(multichan-expand #'result s))
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