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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; leslie.cms
;;
;; Time varying delay-lines
;; ========================
;; Doppler shift for Leslie
;;
;; Based on:
;; Abel, Berners, Serafin, Smith J.O
;; "Doppler Simulation and the Leslie",
;; Proc. of DAFx-02, September, 2002
;;
;; Thanks to Patty Huang
;;
;;
;; Syntax: CLM-4, S7
;;
;;
;; juanig@ccrma
;;
;; First version March 20, 2004
;; Last update September 12, 2014
;;
;; NOTES:
;; Get Leslie effect on a pulse-train waveshape. Try acceleration with the vel-envelope.
;; It can also be used to apply a Leslie effect to a soundfile. Just switch to the
;; 'make-readin', readin ug.
;;
;; 06/20/2014 fixed delays and delay lines length
;; 09/10/2014 added reflection delay lines
;; 09/12/2014 added lowport baffle section using a lowpass butterworth
;; 09/18/2014 S7 .cms version
;;
;;
(define sspeed 345.12) ;; Velocity of sound
(define twopi (* 2 pi))
(define oneturn (* pi 2))
;; We need a Lowpass filter for the lower part, low frequency (baffle)
;; of the Leslie cabinet
;; A butterworth Lowpass filter (as in dsp.scm).
(define (make-butter-low-pass fq)
(let* ((r (/ 1.0 (tan (/ (* pi fq) *clm-srate*))))
(r2 (* r r))
(c1 (/ 1.0 (+ 1.0 (* r (sqrt 2.0)) r2)))
(c2 (* 2.0 c1))
(c3 c1)
(c4 (* 2.0 (- 1.0 r2) c1))
(c5 (* (+ (- 1.0 (* r (sqrt 2.0))) r2) c1))
(arra (make-float-vector 3 ))
(arrb (make-float-vector 3 )))
(set! (arra 0) c1)
(set! (arra 1) c2)
(set! (arra 2) c3)
(set! (arrb 0) 0.0)
(set! (arrb 1) c4)
(set! (arrb 2) c5)
(make-filter 3 arra arrb) ))
;;; Macros to handle Lowpass filter
;;
(define (butter f sample0)
(filter f sample0))
;; macro to sweep frequencies
;;
(define (sweep-butterfq b freq)
`(let* ((fq ,freq)
(r (/ 1.0 (tan (/ (* pi fq) *srate*))))
(r2 (* r r))
(c1 (/ 1.0 (+ 1.0 (* r (sqrt 2.0)) r2))))
(set! (mus-xcoeff ,b 0) c1)
(set! (mus-xcoeff ,b 1) (* 2.0 c1))
(set! (mus-xcoeff ,b 2) c1)
(set! (mus-ycoeff ,b 1) (* 2.0 (- 1.0 r2) c1))
(set! (mus-ycoeff ,b 2) (* (+ (- 1.0 (* r (sqrt 2.0))) r2) c1))
))
(definstrument (rotates start dur freq
(speedsl 3.33) ;; Speed source listener mts/sec
(velenv '(0 1 100 1)) ;; Velocity envelope
(gain 0.125) ;; scales output
;; (onset 0.0) ;; onset values in case of reading a soundfile
(rev-amount 0.025)) ;; very short reverb
(let* ((beg (seconds->samples start))
(sig (make-pulse-train :frequency freq))
;;; (rdA (make-readin :file file ;; just in case you want to read
;;; :start (seconds->samples onset)) ;; a soundfile instead
;;;
(maxddelayl (if (= *clm-srate* 44100) (values 96)
(values 104)))
(startddelay (if (= *clm-srate* 44100) (values 48)
(values 52)))
(m2samp (/ *clm-srate* sspeed))
(vel-env (make-env velenv :duration (* dur 0.5)))
;;;
;;; Doppler delay lines
;;;
(dpdelays (make-vector 4))
(dshift (make-vector 4 startddelay))
;;
;;;
;;; Reflection path delay arrays
;;;
(refldelays (make-vector 4))
(reflectlen (make-vector 4))
(reflections (make-vector 4 0.0))
(hornout (make-vector 4 0.0))
;;
;; Lowpass (baffle) 'frequency shift' array
(fshift (make-vector 4))
(baffleout (make-vector 4))
;;
(bfila (make-butter-low-pass 200))
(bfilb (make-butter-low-pass 200))
(bfilc (make-butter-low-pass 200))
(bfild (make-butter-low-pass 200))
;;
(growf0 0.0)
(growf1 0.0)
(growfa 0.0)
(growfb 0.0)
;;
(hornangvel 1.0)
(baffleangvel 1.0)
(hornangle 0.0)
(hornradius 0.18)
(baffleangle 0.0)
(baffleradius 0.19050)
;;
(xdev 0.0)
(ydev 0.0)
(cabinetlen 0.71)
(cabinetwid 0.52)
;;
(end (+ beg (seconds->samples dur)))
)
;;
;; Make delays
;;
(do ((i 0 (1+ i)))
((= i 4 ))
(set! (dpdelays i) (make-delay :size startddelay
:max-size maxddelayl
:type mus-interp-linear))
(set! (refldelays i) (make-delay )))
;;
;;
;;;
;;; main loop
;;;
(do ((i beg (1+ i)))
((= i end ))
;;
(let ((sample (pulse-train sig))
;;; (sample (readin rdA)) switch in case of reading a soundfile
(deltavel (env vel-env))
(sigouta 0.0) (sigoutb 0.0) ;; horn
(sigoutc 0.0) (sigoutd 0.0) ;; reflections
(woofera 0.0) (wooferb 0.0)) ;; low baffle output
;;
;; set acceleration of horn
(set! hornangvel (* speedsl deltavel))
(set! hornangle (+ hornangle (* twopi (/ hornangvel *clm-srate*))))
;; baffle lower port
(set! baffleangvel (* 0.98 speedsl ))
(set! baffleangle (+ baffleangle (* twopi (/ baffleangvel *clm-srate*))))
;;
(if (> hornangle twopi) (set! hornangle (- hornangle twopi)))
(if (> baffleangle twopi) (set! baffleangle (- baffleangle twopi)))
;;
;; calculate grow functions for delay line size (horn Doppler shifts)
(set! growf0 (/ (*(* (- twopi) hornradius) (* hornangvel (cos hornangle))) sspeed))
(set! growf1 (/ (*(* (- twopi) hornradius) (* hornangvel (sin hornangle))) sspeed))
;;
(set! (dshift 0) (- (dshift 0) growf0))
(set! (dshift 1) (- (dshift 1) growf1))
(set! (dshift 2) (- (dshift 2) (- growf0)))
(set! (dshift 3) (- (dshift 3) (- growf1)))
;;
(do ((j 0 (1+ j)))
((= j 4))
(set! (hornout j ) (delay (dpdelays j) sample (dshift j)))
)
;;
;; Reflections
;;
(set! xdev (* hornradius (cos hornangle)))
(set! ydev (* hornradius (sin hornangle)))
(set! (reflectlen 0) (* (+ (/ cabinetwid 2) ydev) m2samp))
(set! (reflectlen 1) (* (- cabinetlen xdev) m2samp))
(set! (reflectlen 2) (* 1.5 (- cabinetwid ydev) m2samp))
(set! (reflectlen 3) (* (+ cabinetlen xdev) m2samp))
;;
;; Need to add these reflections to *reverb*
(do ((j 0 (1+ j)))
((= j 4))
(set! (reflections j) (delay (refldelays j)
(hornout j)
(reflectlen j))))
;;
(set! sigouta (+ (hornout 0) (hornout 2)))
(set! sigoutb (+ (hornout 1) (hornout 3)))
(set! sigoutc (+ (reflections 0) (reflections 2)))
(set! sigoutd (+ (reflections 1) (reflections 3)))
;;
;; Grow functions baffle low port section
(set! growfa (* (- twopi) baffleradius baffleangvel (cos baffleangle)))
(set! growfb (* (- twopi) baffleradius baffleangvel (sin baffleangle)))
;;
(set! (fshift 0) (+ 250 (* growfa 50)))
(set! (fshift 1) (+ 250 (* growfb 50)))
(set! (fshift 2) (+ 250 (* (- growfa) 50)))
(set! (fshift 3) (+ 250 (* (- growfb) 50)))
;;
(sweep-butterfq bfila (fshift 0))
(sweep-butterfq bfilb (fshift 1))
(sweep-butterfq bfilc (fshift 2))
(sweep-butterfq bfild (fshift 3))
;;
(set! (baffleout 0) (butter bfila sample))
(set! (baffleout 1) (butter bfilb sample))
(set! (baffleout 2) (butter bfilc sample))
(set! (baffleout 3) (butter bfild sample))
;;
(set! woofera (+ (baffleout 0) (baffleout 2)))
(set! wooferb (+ (baffleout 1) (baffleout 3)))
;;
(outa i (* gain (+ sigouta sigoutc woofera)))
(outb i (* gain (+ sigoutb sigoutd wooferb)))
;;;
(if *reverb*
(progn
(outa i (* (* 0.5 gain) (+ sigoutc woofera) rev-amount) *reverb*)
(outb i (* (* 0.5 gain) (+ sigoutd wooferb) rev-amount) *reverb*) ))
))
))
;;; (with-sound (:channels 2) (rotates 0 1 800))
;;; (with-sound (:channels 2) (rotates 0 3 200))
;;; (with-sound (:channels 2) (rotates 0 8 300 :speedsl 1.0))
;;; (with-sound (:channels 2) (rotates 0 3 500 :speedsl 1.0))
;;; (with-sound (:channels 2) (rotates 0 3 500 :velenv '(0 0 100 1)))
;;; (with-sound (:channels 2) (rotates 0 3 500 :velenv '(0 1 100 0.25)))
;;; (load "nrev.ins")
;;; (with-sound (:channels 2 :reverb nrev :reverb-channels 2) (rotates 0 5 500 :velenv '(0 1 100 0.25)))
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