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|
;;; fm-violin as a generator (and at end, original instrument using this generator)
;;;
;;; make-fm-violin takes the same args as the instrument version with the following changes
;;; beg and dur are omitted, also degree, reverb-amount, distance
;;; all envelopes default to constants (rather than envelopes)
;;; from the generator's point of view, each envelope is a function called at run time to get its next value,
;;; very much like "as-needed" input in src or granulate, so the envelopes could actually be any
;;; arbitrary function you like (see examples at end).
;;; returns a violin function
;;; fm-violin takes the value returned by make-fm-violin and returns a new sample each time it is called
(provide 'snd-fmv.scm)
(define make-fm-violin
(let ((+documentation+ "(make-fm-violin frequency amplitude
(fm-index 1.0) (amp-env #f) (periodic-vibrato-rate 5.0)
(random-vibrato-rate 16.0) (periodic-vibrato-amplitude 0.0025)
(random-vibrato-amplitude 0.005) (noise-amount 0.0)
(noise-freq 1000.0) (ind-noise-freq 10.0) (ind-noise-amount 0.0)
(amp-noise-freq 20.0) (amp-noise-amount 0.0) (gliss-env #f)
(fm1-env #f) (fm2-env #f) (fm3-env #f) (fm1-rat 1.0)
(fm2-rat 3.0) (fm3-rat 4.0) (fm1-index #f) (fm2-index #f)
(fm3-index #f) (base 1.0))
makes a new fm-violin generator. It is the same as the v.scm version,
but does not assume it is running within with-sound. In terms of arguments
beg, dur, degree, reverb-amount, and distance are omitted,
and all envelopes default to constants (rather than envelopes).
From the generator's point of view, each envelope is a function called at run time to get its next value,
very much like 'as-needed' input in src or granulate.
fm-violin takes the value returned by make-fm-violin and returns a new sample each time it is called:
(define (test-v beg dur freq amp)
(let ((v (make-fm-violin freq amp
:amp-env (let ((e (make-env :envelope '(0 0 1 1 2 0)
:scaler amp :length dur)))
(lambda () (env e)))))
(data (channel->float-vector beg dur)))
(do ((i 0 (+ 1 i))) ((= i dur))
(set! (data i) (+ (data i) (v))))
(float-vector->channel data beg dur))))"))
(lambda* (frequency amplitude
(fm-index 1.0)
amp-env
(periodic-vibrato-rate 5.0)
(random-vibrato-rate 16.0)
(periodic-vibrato-amplitude 0.0025)
(random-vibrato-amplitude 0.005)
(noise-amount 0.0)
(noise-freq 1000.0)
(ind-noise-freq 10.0)
(ind-noise-amount 0.0)
(amp-noise-freq 20.0)
(amp-noise-amount 0.0)
gliss-env
fm1-env
fm2-env
fm3-env
(fm1-rat 1.0)
(fm2-rat 3.0)
(fm3-rat 4.0)
fm1-index
fm2-index
fm3-index
(base 1.0))
(let ((frq-scl (hz->radians frequency)))
(let ((maxdev (* frq-scl fm-index))
(logfreq (log frequency)))
(let ((modulate (not (zero? fm-index)))
(index1 (or fm1-index (min pi (* maxdev (/ 5.0 logfreq)))))
(index2 (or fm2-index (min pi (/ (* maxdev 3.0 (- 8.5 logfreq)) (+ 3.0 (* frequency 0.001))))))
(index3 (or fm3-index (min pi (* maxdev (/ 4.0 (sqrt frequency))))))
(easy-case (and (zero? noise-amount)
(or (not fm2-env) (equal? fm1-env fm2-env))
(or (not fm3-env) (equal? fm1-env fm3-env))
(= fm1-rat (floor fm1-rat))
(= fm2-rat (floor fm2-rat))
(= fm3-rat (floor fm3-rat)))))
(let ((carrier (make-oscil frequency))
(fmosc1 (and modulate (make-oscil (* fm1-rat frequency))))
(fmosc2 (and modulate (or easy-case (make-oscil (* fm2-rat frequency)))))
(fmosc3 (and modulate (or easy-case (make-oscil (* fm3-rat frequency)))))
(coeffs (and easy-case modulate
(partials->polynomial
(list (floor fm1-rat) index1
(floor (/ fm2-rat fm1-rat)) index2
(floor (/ fm3-rat fm1-rat)) index3))))
(ampf (or amp-env (lambda () amplitude)))
(indf1 (or fm1-env (lambda () (or (and easy-case modulate 1.0) index1))))
(indf2 (or fm2-env (lambda () index2)))
(indf3 (or fm3-env (lambda () index3)))
(pervib (make-triangle-wave periodic-vibrato-rate (* periodic-vibrato-amplitude frq-scl)))
(ranvib (make-rand-interp random-vibrato-rate (* random-vibrato-amplitude frq-scl)))
(fm-noi (and (not (= 0.0 noise-amount))
(make-rand noise-freq (* pi noise-amount))))
(amp-noi (and (not (= 0.0 amp-noise-amount))
(not (= 0.0 amp-noise-freq))
(make-rand-interp amp-noise-freq amp-noise-amount)))
(ind-noi (and (not (= 0.0 ind-noise-amount))
(not (= 0.0 ind-noise-freq))
(make-rand-interp ind-noise-freq ind-noise-amount)))
(frqf (or gliss-env (lambda () 0.0))))
(lambda ()
(let ((vib (+ (frqf) (triangle-wave pervib) (rand-interp ranvib)))
(fuzz (if (rand? fm-noi) (rand fm-noi) 0.0)))
(* (ampf)
(if amp-noi (+ 1.0 (rand-interp amp-noi)) 1.0)
(oscil carrier
(+ vib
(* (if ind-noi (+ 1.0 (rand-interp ind-noi)) 1.0)
(if (not fmosc1)
0.0
(if coeffs
(* (indf1)
(polynomial coeffs (oscil fmosc1 vib)))
(+ (* (indf1) (oscil fmosc1 (+ (* fm1-rat vib) fuzz)))
(* (indf2) (oscil fmosc2 (+ (* fm2-rat vib) fuzz)))
(* (indf3) (oscil fmosc3 (+ (* fm3-rat vib) fuzz)))))))))))))))))))
#|
(define test-v
(lambda (beg dur freq amp amp-env)
(let ((v (make-fm-violin
freq amp
:amp-env (let ((e (make-env :envelope (or amp-env '(0 0 1 1 2 0))
:scaler amp
:length dur)))
(lambda () (env e)))))
(data (channel->float-vector beg dur)))
(do ((i 0 (+ 1 i)))
((= i dur))
(set! (data i) (+ (data i) (v))))
(float-vector->channel data beg dur))))
;;; (with-sound () (test-v 0 10000 440 .1 '(0 0 1 1 2 0)))
(define test-v1
;; use oscil as index envelope
(lambda (beg dur freq amp amp-env)
(let ((v (make-fm-violin
freq amp
:amp-env (let ((e (make-env :envelope (or amp-env '(0 0 1 1 2 0))
:scaler amp
:length dur)))
(lambda () (env e)))
:fm1-env (let ((osc (make-oscil 100.0)))
(lambda () (oscil osc)))))
(data (channel->float-vector beg dur)))
(do ((i 0 (+ 1 i)))
((= i dur))
(set! (data i) (+ (data i) (v))))
(float-vector->channel data beg dur))))
|#
(define fm-violin-ins
(let ((+documentation+ "(fm-violin-ins startime dur freq amp degree (reverb-amount 0.0) (distance 1.0) :rest args)
calls the fm-violin with the given args and mixes the results into the current sound"))
(lambda* (startime dur freq amp degree (reverb-amount 0.0) (distance 1.0) :rest args)
(let ((beg (floor (* startime (srate))))
(len (floor (* dur (srate)))))
(let ((loc (make-locsig :channels (channels) :degree (or degree (random 90.0)) :reverb reverb-amount :distance distance))
(out-data (make-float-vector len))
(v (apply make-fm-violin freq amp args)))
(do ((i 0 (+ 1 i)))
((= i len))
(set! (out-data i) (v)))
(if (= (channels) 2)
(let ((bsamps (copy out-data)))
(mix-float-vector (float-vector-scale! bsamps (locsig-ref loc 1)) beg #f 1 #f)
(mix-float-vector (float-vector-scale! out-data (locsig-ref loc 0)) beg #f 0 #f))
(mix-float-vector out-data beg #f 0 #f)))))))
|
