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|
;nyquist plug-in
;version 3
;type generate
;categories "http://lv2plug.in/ns/lv2core#GeneratorPlugin"
;name "Risset Drum..."
;action "Generating Risset Drum..."
;info "Risset Drum generator by Steven Jones, after Jean Claude Risset\nReleased under terms of the GNU General Public License version 2\nProduces a realistic drum sound consisting of three components;\na sine wave ring-modulated by narrow band noise, an enharmonic\ntone, and a relatively strong sine wave at the fundamental"
;control frq "Frequency [Hz]" real "" 100 50 2000
;control decay "Decay [seconds]" real "" 2 0.125 10
;control cf "Center frequency of noise [Hz]" real "" 500 100 5000
;control bw "Width of noise band [Hz]" real "" 400 10 1000
;control noise "Amount of noise in mix [percent]" real "" 50 0 100
(if (not (boundp '*rdrum-wtabsize*))
(progn
(setq *rdrum-wtabsize* 2048)
(setq *rdrum-wtab*
(list (sum
(scale 1.00 (build-harmonic 10 *rdrum-wtabsize*))
(scale 1.50 (build-harmonic 16 *rdrum-wtabsize*))
(scale 2.00 (build-harmonic 22 *rdrum-wtabsize*))
(scale 1.50 (build-harmonic 23 *rdrum-wtabsize*)))
(hz-to-step 1) t))))
(defun log2 (n)
(/ (log (float n))(log 2.0)))
(defun percussion (decay)
(let* ((half-life (expt 2.0 (- (log2 decay) 3))))
(exp-dec 0 half-life decay)))
(defun pink (dur cutoff)
(lowpass6 (noise dur) cutoff))
(defun risset-drum (frq decay cf bw noise)
(let* ((decay2 (* decay 0.50))
(pitch1 (hz-to-step frq))
(pitch2 (hz-to-step (* frq 0.10)))
(noise-mix (float (min (max (/ noise 100) 0) 1)))
(tone-mix (- 1 noise-mix)))
(sum (mult
(sum (scale noise-mix
(mult (sine (hz-to-step cf) decay2)
(pink decay2 bw)))
(scale (* tone-mix 0.17)
(osc pitch2 decay2 *rdrum-wtab*)))
(percussion decay2))
(mult (scale tone-mix (sine pitch1 decay))
(percussion decay)))))
;; Generate signal and normalize.
;; ISSUE: Is there any way to normalize signal without
;; generating it twice?
;;
(setf peakval (peak (risset-drum frq decay cf bw (/ noise 100))
ny:all))
(scale (/ 0.8 peakval)(risset-drum frq decay cf bw (/ noise 100)))
|
