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|
;;; this is a translation to Snd (from CLM's prc-toolkit95.lisp)
;;; of Perry Cook's Physical Modelling Toolkit.
(provide 'snd-prc95.scm)
(if (provided? 'snd)
(require snd-ws.scm)
(require sndlib-ws.scm))
(define* (make-reed (offset 0.6) (slope -0.8))
(float-vector offset slope))
(define (reedtable r samp)
(min 1.0 (+ (r 0) (* (r 1) samp))))
(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)))))))
(define (jettable samp)
(max -1.0 (min 1.0 (* samp (- (* samp samp) 1.0)))))
(define* (make-onezero (gain 0.5) (zerocoeff 1.0))
(make-one-zero gain (* gain zerocoeff)))
(define* (make-onep (polecoeff 0.9))
(make-one-pole (- 1.0 polecoeff) (- polecoeff)))
(define (set-pole p val)
(set! (mus-ycoeff p 1) (- val))
(set! (mus-xcoeff p 0) (- 1.0 val)))
(define (set-gain p val)
(set! (mus-xcoeff p 0) (* (mus-xcoeff p 0) val)))
(define (lip-set-freq b freq)
(set! (mus-frequency b) freq))
(define (lip b mouthsample boresample)
(let ((temp (formant b (- mouthsample boresample))))
(set! temp (min 1.0 (* temp temp)))
(+ (* temp mouthsample) (* (- 1.0 temp) boresample))))
(define (make-dc-block)
(float-vector 0.0 0.0))
(define (dc-block b samp)
(set! (b 1) (- (+ samp (* 0.99 (b 1))) (b 0)))
(set! (b 0) samp)
(b 1))
;; we could also use a filter generator here: (make-filter 2 (float-vector 1 -1) (float-vector 0 -0.99))
;;; this ia a 0-based versions of the clm delays
(defgenerator dlya (outp 0) (input #f))
(define (make-delayl len lag)
;; Perry's original had linear interp bug, I think -- this form is more in tune
(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)))
;;; now some example instruments
(definstrument (plucky beg dur freq amplitude maxa)
;; (with-sound () (plucky 0 .3 440 .2 1.0))
(let ((len (+ 1 (floor (/ *clm-srate* 100.0))))) ; 100 = lowest freq
(let ((delayline (make-delayl len (- (/ *clm-srate* freq) 0.5)))
(filt (make-onezero))
(start (seconds->samples beg))
(end (seconds->samples (+ beg dur)))
(dout 0.0))
(do ((i 0 (+ i 1)))
((= i len))
(set! dout (delayl delayline (+ (* 0.99 dout) (mus-random maxa)))))
(do ((i start (+ i 1)))
((= i end))
(set! dout (delayl delayline (one-zero filt dout)))
(outa i (* amplitude dout))))))
;;; freq is off in this one (in prc's original also)
(definstrument (bowstr beg dur frq amplitude maxa)
;; (with-sound () (bowstr 0 .3 220 .2 1.0))
(let ((len (+ 1 (floor (/ *clm-srate* 100.0))))) ; 100 = lowest freq
(let ((ratio 0.8317)
(rate .001)
(bowing #t)
(temp (- (/ *clm-srate* frq) 4.0)))
(let ((neckdelay (make-delayl len (* temp ratio)))
(bridgedelay (make-delayl (floor (/ len 2)) (* temp (- 1.0 ratio))))
(bowtab (make-bowtable :slope 3.0))
(filt (make-onep))
(bowvelocity rate)
(maxvelocity maxa)
(attackrate rate)
(st (seconds->samples beg))
(end (seconds->samples (+ beg dur)))
(release (seconds->samples (* .8 dur)))
(ctr 0)
(bridgeout 0.0)
(neckout 0.0))
(set-pole filt 0.6)
(set-gain filt 0.3)
(do ((i st (+ i 1))
(bridgerefl 0.0 0.0)
(nutrefl 0.0 0.0)
(veldiff 0.0 0.0)
(stringvel 0.0 0.0)
(bowtemp 0.0 0.0))
((= i end))
(if bowing
(if (not (= maxvelocity bowvelocity))
(set! bowvelocity ((if (< bowvelocity maxvelocity) + -) bowvelocity attackrate)))
(if (> bowvelocity 0.0)
(set! bowvelocity (- bowvelocity attackrate))))
(set! bowtemp (* 0.3 bowvelocity))
(let ((filt-output (one-pole filt bridgeout)))
(set! bridgerefl (- filt-output))
(set! nutrefl (- neckout))
(set! stringvel (+ bridgerefl nutrefl))
(set! veldiff (- bowtemp stringvel))
(set! veldiff (* veldiff (bowtable bowtab veldiff)))
(set! neckout (delayl neckdelay (+ bridgerefl veldiff)))
(set! bridgeout (delayl bridgedelay (+ nutrefl veldiff)))
(outa i (* amplitude 10.0 filt-output))
(if (= ctr release)
(begin
(set! bowing #f)
(set! attackrate .0005)))
(set! ctr (+ ctr 1))))))))
(definstrument (brass beg dur freq amplitude maxa)
;; does this work at all?
(let ((len (+ 1 (floor (/ *clm-srate* 100.0)))))
(let ((blowing #t)
(rate .001)
(breathpressure 0.0)) ; 0.1 ?
(let ((delayline (make-delayl len (+ 1.0 (/ *clm-srate* freq))))
(lipfilter (make-formant freq))
(dcblocker (make-dc-block))
(maxpressure maxa)
(attackrate rate)
(st (seconds->samples beg))
(end (seconds->samples (+ beg dur)))
(release (seconds->samples (* .8 dur)))
(ctr 0)
(dout 0.0))
(do ((i st (+ i 1)))
((= i end))
(if blowing
(if (not (= maxpressure breathpressure))
(set! breathpressure ((if (< breathpressure maxpressure) + -) breathpressure attackrate)))
(if (> breathpressure 0.0)
(set! breathpressure (- breathpressure attackrate))))
(set! dout (delayl delayline (dc-block dcblocker
(lip lipfilter
(* 0.3 breathpressure)
(* 0.9 dout)))))
(outa i (* amplitude dout))
(if (= ctr release)
(begin
(set! blowing #f)
(set! attackrate .0005)))
(set! ctr (+ ctr 1)))))))
(definstrument (clarinet beg dur freq amplitude maxa)
;; (with-sound () (clarinet 0 .3 440 .2 1.0))
(let ((len (+ 1 (floor (/ *clm-srate* 100.0)))))
(let ((blowing #t)
(breathpressure 0.0) ; 0.1 ?
(rate .001))
(let ((delayline (make-delayl len (- (* 0.5 (/ *clm-srate* freq)) 1.0)))
(rtable (make-reed :offset 0.7 :slope -0.3))
(filt (make-onezero))
(maxpressure maxa)
(attackrate rate)
(st (seconds->samples beg))
(end (seconds->samples (+ beg dur)))
(ctr 0)
(release (seconds->samples (* .8 dur)))
(dlyout 0.0))
(do ((i st (+ i 1)))
((= i end))
(if blowing
(if (not (= maxpressure breathpressure))
(set! breathpressure ((if (< breathpressure maxpressure) + -) breathpressure attackrate)))
(if (> breathpressure 0.0)
(set! breathpressure (- breathpressure attackrate))))
(let ((pressurediff (- (one-zero filt (* -0.95 dlyout)) breathpressure)))
(set! dlyout (delayl delayline
(+ breathpressure
(* pressurediff
(reedtable rtable pressurediff))))))
(outa i (* amplitude dlyout))
(if (= ctr release)
(begin
(set! blowing #f)
(set! attackrate .0005)))
(set! ctr (+ ctr 1)))))))
(definstrument (flute beg dur freq amplitude maxa)
;; (with-sound () (flute 0 .3 440 .2 1.0))
(let ((len (+ 1 (floor (/ *clm-srate* 100.0)))))
(let ((jetrefl 0.6)
(endrefl 0.6)
(sinphase 0.0)
(blowing #t)
(rate .0005)
(breathpressure 0.0) ; 0.1 ?
(ratio 0.8)
(temp (- (/ *clm-srate* freq) 5.0)))
(let ((jetdelay (make-delayl (floor (/ len 2)) (* temp (- 1.0 ratio))))
(boredelay (make-delayl len (* ratio temp)))
(filt (make-onep))
(dcblocker (make-dc-block))
(maxpressure maxa)
(attackrate rate)
(st (seconds->samples beg))
(end (seconds->samples (+ beg dur)))
(ctr 0)
(release (seconds->samples (* .8 dur)))
(boreout 0.0))
(set-pole filt 0.8)
(set-gain filt -1.0)
(do ((i st (+ i 1)))
((= i end))
(let ((randpressure (random (* 0.1 breathpressure))))
(set! sinphase (+ sinphase 0.0007)) ;5 hz vibrato?
(if (> sinphase 6.28) (set! sinphase (- sinphase 6.28)))
(set! randpressure (+ randpressure (* 0.05 breathpressure (sin sinphase))))
(if blowing
(if (not (= maxpressure breathpressure))
(set! breathpressure ((if (< breathpressure maxpressure) + -) breathpressure attackrate)))
(if (> breathpressure 0.0)
(set! breathpressure (- breathpressure attackrate))))
(let ((pressurediff (let ((temp (dc-block dcblocker (one-pole filt boreout))))
(+ (jettable (delayl jetdelay (- (+ breathpressure randpressure) (* jetrefl temp))))
(* endrefl temp)))))
(set! boreout (delayl boredelay pressurediff)))
(outa i (* 0.3 amplitude boreout))
(if (= ctr release)
(begin
(set! blowing #f)
(set! attackrate .0005)))
(set! ctr (+ ctr 1))))))))
#|
(with-sound ()
(plucky 0 .3 440 .2 1.0)
(bowstr .5 .3 220 .2 1.0)
(brass 1 .3 440 .2 1.0)
(clarinet 1.5 .3 440 .2 1.0)
(flute 2 .3 440 .2 1.0))
|#
|
