1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;; Banded Waveguide Tibetan Bowl Instrument based on
;;; ====== ========= ======= ==== ==========
;;;
;;; Essl, G. and Cook, P. "Banded
;;; Waveguides: Towards Physical Modelling of Bar
;;; Percussion Instruments", Proceedings of the
;;; 1999 International Computer Music Conference.
;;;
;;; Also, Essl, Serafin, Cook, and Smith J.O.,
;;; "Theory of Banded Waveguides", CMJ, 28:1,
;;; pp37-50, Spring 2004.
;;;
;;;
;;; CLM version by Juan Reyes 2004-2005,
;;; NOTES:
;;; As with all physical models, initial conditions matter.
;;; Frequency range is not too broad. 220Hz. is a good
;;; starting point.
;;;
;;;
;;; 08/24/2013 replaced delay line macros with DelayL using clm's delay ug
;;; 08/29/2014 fixed waveguide with feed and reflections
;;; 08/30/2014 Try different delay line lengths. Fixing bandpass radius param.
;;; 09/08/2014 Tibetan bowl, using formant filter ug.
;;; 09/14/2014 This SND's S7 version
;;;
(define* (make-bowtable (offset 0.0) (slope 1.0))
(float-vector offset slope))
(define (bowtable b samp)
(max 0.0 (- 1.0 (abs (* (b 1) (+ samp (b 0)))))))
;;; Let's try a formant for bandpass filtering
(define (make-formantbp freq radius)
(make-formant freq radius))
(define (formantbp f sample0)
(formant f sample0))
;;; Delay line structures and functions using SND's delay generator (as per prc95.scm)
(defgenerator dlya (outp 0) (input #f))
(define (make-delayl len lag)
(make-dlya :input (make-delay len :max-size (ceiling (+ len lag 1)))
:outp (- lag len)))
(define (delayl d samp)
(delay-tick (d 'input) samp)
(tap (d 'input) (d 'outp)))
;;;;;;;;;;;;;;;;;;;;
(definstrument (singbowl beg dur freq amplitude
(maxa 0.9998) ;; max bow velocity
(bv 1.0) ;; bow velocity scaler
;; velocity envelope
(vel-env '(0 1.0 .95 1.1 1 1.0))
(amp-env '(0 0 0.5 1 1 0)) ;;'(0 0.0 .95 1.0 .99 0.00))
(rev-amount .08) )
(let ((nrmodes 12)
(ratius 0.45))
(let* ((start (seconds->samples beg))
(baselen (/ *clm-srate* (* freq ratius))) ;; original stk delayl length
(baselag (/ *clm-srate* (* 0.9 freq ratius)))
(dtapoffs 7.0) ;; tap offset is 0.0 in StK's version
(bandpass (make-vector nrmodes))
(delayslft (make-vector nrmodes))
(delaysrfl (make-vector nrmodes))
(modes (make-float-vector nrmodes))
(gains (make-float-vector nrmodes))
(basegains (make-float-vector nrmodes))
(excitations (make-float-vector nrmodes))
(delastout (make-float-vector nrmodes))
;;
(fradius 0.0) ;; radius for bandpass filter
(dlength 0.0) ;; delay-line length
(dlag 0.0) ;; delay lag (for tap)
;;
(bowtab (make-bowtable :slope 3.0 :offset 0.001))
(ampenv (make-env amp-env :scaler amplitude :duration dur))
;; (vel-env (make-env vel-env :scaler bv :duration dur))
;;
(maxvelocity maxa)
(end (+ start (seconds->samples dur)))
)
;;
;;
;; Tibetan Prayer Bowl (ICMC'02)
;;
(set! (modes 0) 0.996108344)
(set! (basegains 0) 0.999925960128219)
(set! (modes 1) 1.0038916562)
(set! (basegains 1) 0.999925960128219)
(set! (modes 2) 2.979178)
(set! (basegains 2) 0.999982774366897)
(set! (modes 3) 2.99329767)
(set! (basegains 3) 0.999982774366897)
(set! (modes 4) 5.704452)
(set! (basegains 4) 1.0) ;; 0.999999999999999999987356406352
(set! (modes 5) 5.704452)
(set! (basegains 5) 1.0) ;; 0.999999999999999999987356406352
(set! (modes 6) 8.9982)
(set! (basegains 6) 1.0) ;;0.999999999999999999996995497558225
(set! (modes 7) 9.01549726)
(set! (basegains 7) 1.0) ;;0.999999999999999999996995497558225
(set! (modes 8) 12.83303)
(set! (basegains 8) 0.99965497558225)
(set! (modes 9) 12.807382)
(set! (basegains 9) 0.999965497558225)
(set! (modes 10) 17.2808219)
(set! (basegains 10) 0.9999999999999999999965497558225)
(set! (modes 11) 21.97602739726)
(set! (basegains 11) 0.999999999999999965497558225)
;;
;;
(set! (excitations 0) (/ 11.900357 10))
(set! (excitations 1) (/ 11.900357 10))
(set! (excitations 2) (/ 10.914886 10))
(set! (excitations 3) (/ 10.914886 10))
(set! (excitations 4) (/ 42.995041 10))
(set! (excitations 5) (/ 42.995041 10))
(set! (excitations 6) (/ 40.063034 10))
(set! (excitations 7) (/ 40.063034 10))
(set! (excitations 8) (/ 7.063034 10))
(set! (excitations 9) (/ 7.063034 10))
(set! (excitations 10) (/ 57.063034 10))
(set! (excitations 11) (/ 57.063034 10))
;;
;; setFrequency method in STK's BandedWG
;;
(set! fradius (- 0.79998 (* pi (/ 32 *clm-srate*))))
(do ((i 0 (+ i 1)))
((= i nrmodes))
(set! dlength (floor (/ baselen (modes i))))
(set! dlag (floor (/ baselag (modes i)))) ;; (- lag len) --> tap offset
(set! (delayslft i) (make-delayl dlength dlag))
(set! (delaysrfl i) (make-delayl dlength dlag))
(set! (gains i) ( basegains i))
(set! (bandpass i)
(make-formantbp (* freq (modes i)) fradius)) )
;;
;;;;;;;;;;;;
;;
(do ((i start (+ i 1)))
((= i end))
;;
(let ((input 0.00)
(velinput 0.00)
(bowvelocity 0.00)
(bplastout 0.0)
(dlastsampl 0.00)
(sample0 0.00)
)
(do ((k 0 (+ k 1)))
((= k nrmodes))
(set! velinput (+ velinput (* (basegains k) (delastout k)))))
;;
;;
;; (set! bowvelocity (* 0.3 (env vel-env) maxvelocity))
(set! bowvelocity (* 0.3 maxvelocity))
(set! input (- bowvelocity velinput))
(set! input (* input (bowtable bowtab input)))
(set! input (/ input nrmodes ))
;;
;; Here the waveguide
;;
(do ((j 0 (1+ j)))
((= j nrmodes))
(set! bplastout
(+ bplastout (formantbp (bandpass j)
(delayl (delayslft j)
(+ input (* (gains j) dlastsampl)) ))))
;;
(set! dlastsampl (+ dlastsampl (delayl ( delaysrfl j) bplastout)))
(set! (delastout j) dlastsampl)
)
;;
;;
(set! sample0 (* 2.0 (env ampenv) bplastout))
;;
(outa i sample0)
;;
(if *reverb*
(begin
(outa i (* sample0 rev-amount) *reverb*)))
)))
))
;;; (with-sound () (singbowl 0 1 200 0.4 ))
;;; (with-sound () (singbowl 0 1 220 0.4 ))
;;; (with-sound () (singbowl 0 1 180 0.2 ))
|
