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;;; ADDITIVE SYNTHESIS
;;; Risset Drum
;;; coded by Pedro Jose Morales
;;; pmorales@iele-ab.uclm.es
(setf *pmorales-path* (current-path))
(load (strcat *pmorales-path* "pjmg.lsp"))
(defun drum-env (amp dur)
(pwev amp dur (* 12e-5 amp)))
(defun noise-component (amp dur central-frq noise-frq)
(amosc (hz-to-step central-frq)
(mult (drum-env (/ amp 2) dur)
(randi1 noise-frq dur))))
(defun fund-component (amp dur frq)
(amosc (hz-to-step frq)
(drum-env (/ amp 2.5) dur)))
(defun drum-inh-wave ()
(setf *drum-inh-table*
(sim (build-harmonic 10 2048)
(scale 1.5 (build-harmonic 16 2048))
(scale 2.0 (build-harmonic 22 2048))
(scale 1.5 (build-harmonic 23 2048))))
(setf *drum-inh-table* (list *drum-inh-table* (hz-to-step 1) T)))
(if (not (boundp '*drum-inh-table*)) (drum-inh-wave))
(defun inh-component (amp dur frq)
(amosc (hz-to-step (/ frq 10))
(drum-env (/ amp 6.0) dur)
*drum-inh-table*))
(defun risset-drum (amp dur frq)
(sim (noise-component amp dur 500 400)
(inh-component amp dur frq)
(fund-component amp dur frq)))
(defun risset-drum-sequence ()
(sim
(at 0.0 (risset-drum 1.0 3.0 100.0))
(at 0.5 (risset-drum 1.0 1.0 50.0))
(at 1.0 (risset-drum 1.0 1.0 75.0))
(at 1.2 (risset-drum 1.0 1.0 200.0))
(at 1.4 (risset-drum 1.0 3.0 300.0))
(at 1.8 (risset-drum 1.0 6.0 500.0))))
(defun risset-drum-demo () (ss (risset-drum-sequence)))
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