70 lines
2.1 KiB
Plaintext
70 lines
2.1 KiB
Plaintext
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;nyquist plug-in
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;version 4
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;type generate
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;categories "http://lv2plug.in/ns/lv2core#GeneratorPlugin"
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;author "dm"
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;name "Reverb Impulse Drum..."
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;action "Generating..."
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;info ""
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;control band-list "List: (center amplitude &optional bandwith)" string "" "(420 0.5 250) (1500 0.3 150) (4300 0.01) (7500 0.02 2000) (12345 0.01 3000) (3500 0.05 300)"
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;control impulse-type "Kind of Impulse" choice "chirp, noise, spike" 0
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;control impulse-volume "Volume of Impulse" float "" 0.5 0 1
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;control impulse-length "Length of Impulse (ms)" float "" 10 1 50
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;control decay "Decay" float "" 0.5 0.01 1
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(setq impulse-length (mult 0.001 impulse-length))
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;Stolen from David R. Sky's Sequencer2, I don't know how this works.
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(defun string-to-list (string)
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(read (make-string-input-stream (format nil "(~a)" string))))
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(defun normalize (signal &optional (amplitude 1))
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(setf factor (/ amplitude (peak signal ny:all)))
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(scale factor signal)
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);end normalize
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(defun gen-noiseband (center &optional (amplitude 1) (bandwidth 1000))
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(partial (hz-to-step center) (lowpass8 (normalize (noise 1) amplitude) bandwidth))
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);end gen-noiseband
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(defun gen-response (band-list dur)
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(setf bands ())
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(dolist (band-params (string-to-list band-list))
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(setf bands (cons (apply #'gen-noiseband band-params) bands))
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);end dolist
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(mult (normalize (apply #'sim bands) impulse-volume)
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(pwlv 1 (* dur 0.25) 0.1 dur 0))
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);end response
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(defun chirp-impulse (dur)
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(mult (hzosc (sum
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(pwlv (/ *sound-srate* 2.1) (* dur 0.3) 100 dur 1) ;frequency of hzosc
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(scale 100 (noise dur)) ;noise to vary frequency of chirp randomly
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));end of hzosc
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(pwlv 1 dur 0)) ;envelope to get rid of click at and of impulse
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);end gen-impulse
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(defun noise-impulse (dur)
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(noise dur)
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)
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(defun spike-impulse (dur)
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(pwl (/ dur 5.0) 1 dur 0)
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)
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(defun gen-impulse (dur)
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(cond ;chooses which kind of impulse
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((= impulse-type 0) (chirp-impulse dur))
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((= impulse-type 1) (noise-impulse dur))
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((= impulse-type 2) (spike-impulse dur))
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);end cond
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)
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(setf impulse (normalize (gen-impulse impulse-length) impulse-volume))
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(setf response (gen-response band-list decay))
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(lowpass8 (sum
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impulse
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(convolve impulse response))
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15000)
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