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|
;;; maxf.scm -- CLM -> Snd/Scheme translation of maxf.ins
;; Translator/Author: Michael Scholz <scholz-micha@gmx.de>
;; Last: Tue Mar 25 04:32:23 CET 2003
;; Version: $Revision: 1.2 $
;; array -> vector functions added by Bill S, 18-Apr-11
;; defgenerator changes (Bill 25-Jul-12)
;; It follows the original header by Juan Reyes.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; maxf.ins
;; This is Max Mathews (mvm) new filter (2002)
;; High-Q, 2-Integrator, filter with
;; Two Poles, and one Zero at the Origin
;;
;; It synthesizes equal-tempered frequencies
;; integer & just scales out of a wide-band input
;; signal.
;; Based on Max's code (filter.cpp)
;;
;; This heuristic might be called Modal Synthesis.
;; But as well it can also be additive synthesis in
;; which a resonator is initialized to generate the
;; exponentially decaying sinusoids at the desired
;; phase.
;;
;; This implementation written by Juan Reyes with dsp
;; assistance from JOS.
;; This version Oct-30, 2002
;;
;; Change gain(att) of input file if clipping
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(provide 'snd-maxf.scm)
(if (provided? 'snd)
(require snd-ws.scm)
(require sndlib-ws.scm))
(define *locsig-type* mus-interp-sinusoidal)
(define (snd-msg frm . args)
((if (not (string=? "" (getenv "EMACS"))) display snd-print)
(apply format #f frm args)))
(defgenerator mvm sample pp1 pp2 pp3 yy1 yy2 zz1 zz2 out)
(define (mvmfilt b sample0)
(let-set! b 'sample sample0)
(with-let b
(set! yy2 (- (+ (* pp1 yy1)
(* pp2 zz1))
(* pp3 sample)))
(set! zz2 (- zz1 (* pp2 yy2)))
(set! zz1 zz2)
(set! yy1 yy2)
(set! out yy1)))
(define pi2s (/ (* 2.0 pi) *clm-srate*))
(define i2s (/ 2.0 *clm-srate*))
(define tper (/ 1.0 *clm-srate*))
(define (set-coeffs b famp ffreq fdecay)
(let ((centerfreq (* ffreq pi2s)))
(let ((maxdecay (/ (* 2.0 tper) (* centerfreq centerfreq)))
(mindecay (/ tper centerfreq)))
;; Conditions for JOS constraints
;; maxdecay: Filter may be unstable
;; mindecay: Filter may not oscillate
(set! fdecay (max mindecay (min fdecay maxdecay))))
(set! (b 'pp1) (- 1.0 (/ i2s fdecay)))
(set! (b 'pp2) centerfreq)
(set! (b 'pp3) (* (b 'pp2) famp))))
(define (make-array dim1) ; I'm guessing ...
(make-vector (list dim1 3) 0.0))
(define (array-set! arr val i1 i2)
(set! (arr i1 i2) val))
(define array-ref vector-ref)
(define maxfilter
(let ((+documentation+ "(maxfilter file beg (att 1.0) (numf 1) (freqfactor 1.0)
(amplitude 1.0) (amp-env '(0 1 100 1))
(degree (random 90.0)) (distance 1.0) (reverb-amount 0.2))
This is Max Mathews (mvm) new filter (2002) High-Q, 2-Integrator,
filter with Two Poles, and one Zero at the Origin
It synthesizes equal-tempered frequencies integer & just scales
out of a wide-band input signal.
Based on Max's code (filter.cpp)
This heuristic might be called Modal Synthesis. But as well it
can also be additive synthesis in which a resonator is
initialized to generate the exponentially decaying sinusoids at
the desired phase.
(att 1) in-file attenuation
(numf 1) 1 filter
(numf 4) 4 filters
(numf 9) 9 filters
(numf 12) 12 filters
(numf 13) 13 filters"))
(lambda* (file beg
(att 1.0)
(numf 1)
(freqfactor 1.0)
(amplitude 1.0)
(amp-env '(0 1 100 1))
(degree (random 90.0))
(distance 1.0)
(reverb-amount 0.2))
(let ((beg (floor (* beg *clm-srate*)))
(dur (mus-sound-framples file)))
(let ((formfil (make-mvm))
(end (+ beg dur))
(rdA (make-readin :file file :channel 0))
(ampf (make-env :envelope amp-env :scaler amplitude :length dur))
(state-0 (make-array 1))
(state-1 (make-array 12))
(state-2 (make-array 9))
(state-3 (make-array 13))
(state-4 (make-array 4))
(state-5 (make-array 2))
(loc (make-locsig :degree degree
:distance distance
:reverb reverb-amount
:type *locsig-type*)))
(case numf
((1)
(snd-msg ";;;; State 0 (default): One filter~%")
(array-set! state-0 7.54e-002 0 0)
(array-set! state-0 (* 2000 freqfactor) 0 1)
(array-set! state-0 2.0 0 2))
;;
((2)
(snd-msg ";;;; State 5: Two filters~%")
(array-set! state-5 7.54e-003 0 0)
(array-set! state-5 (* 200.0 freqfactor) 0 1)
(array-set! state-5 4.0 0 2)
;;
(array-set! state-5 7.54e-004 1 0)
(array-set! state-5 (* 800.0 freqfactor) 1 1)
(array-set! state-5 1.0 1 2))
;;
((4)
(snd-msg ";;;; State 4: Four filters~%")
(array-set! state-4 7.54e-002 0 0)
(array-set! state-4 (* 1000.0 freqfactor) 0 1)
(array-set! state-4 0.5 0 2)
;;
(array-set! state-4 3.225e-002 1 0)
(array-set! state-4 (* 400.0 freqfactor) 1 1)
(array-set! state-4 3.0 1 2)
;;
(array-set! state-4 1.14e-002 2 0)
(array-set! state-4 (* 800.0 freqfactor) 2 1)
(array-set! state-4 2.8 2 2)
;;
(array-set! state-4 7.54e-002 3 0)
(array-set! state-4 (* 1600.0 freqfactor) 3 1)
(array-set! state-4 1.0 3 2))
;;
((9)
(snd-msg ";;;; State 2: Streached overtone string 9 filters~%")
(array-set! state-2 1.07e-002 0 0)
(array-set! state-2 100.0 0 1)
(array-set! state-2 2.5 0 2)
;;
(array-set! state-2 1.07e-002 1 0)
(array-set! state-2 202.0 1 1)
(array-set! state-2 0.75 1 2)
;;
(array-set! state-2 1.07e-002 2 0)
(array-set! state-2 305.0 2 1)
(array-set! state-2 0.5 2 2)
;;
(array-set! state-2 7.077e-003 3 0)
(array-set! state-2 408.0 3 1)
(array-set! state-2 0.4 3 2)
;;
(array-set! state-2 1.07e-002 4 0)
(array-set! state-2 501.0 4 1)
(array-set! state-2 0.3 4 2)
;;
(array-set! state-2 1.07e-002 5 0)
(array-set! state-2 612.0 5 1)
(array-set! state-2 0.25 5 2)
;;
(array-set! state-2 1.07e-003 6 0)
(array-set! state-2 715.0 6 1)
(array-set! state-2 0.25 6 2)
;;
(array-set! state-2 1.07e-002 7 0)
(array-set! state-2 817.0 7 1)
(array-set! state-2 0.2 7 2)
;;
(array-set! state-2 1.07e-002 8 0)
(array-set! state-2 920.0 8 1)
(array-set! state-2 0.18 8 2))
;;
((12)
(snd-msg ";;;; State 1: Risset bell long 12 filters~%")
(array-set! state-1 5.025e-002 0 0)
(array-set! state-1 224.0 0 1)
(array-set! state-1 3.7 0 2)
;;
(array-set! state-1 5.025e-002 1 0)
(array-set! state-1 225.0 1 1)
(array-set! state-1 3.3 1 2)
;;
(array-set! state-1 5.025e-002 2 0)
(array-set! state-1 368.0 2 1)
(array-set! state-1 2.8 2 2)
;;
(array-set! state-1 5.025e-002 3 0)
(array-set! state-1 369.0 3 1)
(array-set! state-1 2.4 3 2)
;;
(array-set! state-1 1.047e-002 4 0)
(array-set! state-1 476.0 4 1)
(array-set! state-1 1.9 4 2)
;;
(array-set! state-1 5.025e-002 5 0)
(array-set! state-1 680.0 5 1)
(array-set! state-1 1.7 5 2)
;;
(array-set! state-1 5.025e-002 6 0)
(array-set! state-1 800.0 6 1)
(array-set! state-1 1.5 6 2)
;;
(array-set! state-1 4.05e-002 7 0)
(array-set! state-1 1096.0 7 1)
(array-set! state-1 1.1 7 2)
;;
(array-set! state-1 4.05e-002 8 0)
(array-set! state-1 1099.0 8 1)
(array-set! state-1 0.9 8 2)
;;
(array-set! state-1 4.05e-002 9 0)
(array-set! state-1 1200.0 9 1)
(array-set! state-1 0.6 9 2)
;;
(array-set! state-1 3.78e-002 10 0)
(array-set! state-1 1504.0 10 1)
(array-set! state-1 0.4 10 2)
;;
(array-set! state-1 4.05e-002 11 0)
(array-set! state-1 1628.0 11 1)
(array-set! state-1 0.3 11 2))
;;
((13)
(snd-msg ";;;; State 3: Open major chord with repeated octave 12 filters~%")
(array-set! state-3 5.025e-002 0 0)
(array-set! state-3 100.0 0 1)
(array-set! state-3 2.0 0 2)
;;
(array-set! state-3 5.025e-002 1 0)
(array-set! state-3 251.0 1 1)
(array-set! state-3 2.0 1 2)
;;
(array-set! state-3 5.025e-002 2 0)
(array-set! state-3 299.0 2 1)
(array-set! state-3 2.0 2 2)
;;
(array-set! state-3 5.025e-002 3 0)
(array-set! state-3 401.0 3 1)
(array-set! state-3 2.0 3 2)
;;
(array-set! state-3 5.025e-002 4 0)
(array-set! state-3 199.0 4 1)
(array-set! state-3 2.0 4 2)
;;
(array-set! state-3 5.025e-002 5 0)
(array-set! state-3 501.0 5 1)
(array-set! state-3 2.0 5 2)
;;
(array-set! state-3 5.025e-002 6 0)
(array-set! state-3 599.0 6 1)
(array-set! state-3 2.0 6 2)
;;
(array-set! state-3 5.025e-002 7 0)
(array-set! state-3 801.0 7 1)
(array-set! state-3 2.0 7 2)
;;
(array-set! state-3 5.025e-002 8 0)
(array-set! state-3 201.0 8 1)
(array-set! state-3 2.0 8 2)
;;
(array-set! state-3 5.025e-002 9 0)
(array-set! state-3 749.0 9 1)
(array-set! state-3 2.0 9 2)
;;
(array-set! state-3 5.025e-002 10 0)
(array-set! state-3 900.0 10 1)
(array-set! state-3 2.0 10 2)
;;
(array-set! state-3 5.025e-004 11 0)
(array-set! state-3 1205.0 11 1)
(array-set! state-3 2.0 11 2)
;;
(array-set! state-3 5.025e-004 12 0)
(array-set! state-3 1205.0 12 1)
(array-set! state-3 2.0 12 2))
(else
(snd-msg "Please leave default or enter [1] [2] [4] [9] [12] [13]~%")
(set! numf 1)))
(do ((run-state (case numf
((1) state-0)
((2) state-5)
((4) state-4)
((9) state-2)
((12) state-1)
((13) state-3)))
(i beg (+ 1 i)))
((= i end))
(let ((outvalA (* att (readin rdA)))
(add-fl 0.0))
(do ((j 0 (+ 1 j)))
((= j numf))
(set-coeffs formfil (array-ref run-state j 0) (array-ref run-state j 1) (array-ref run-state j 2))
(set! add-fl (+ add-fl (mvmfilt formfil outvalA))))
(locsig loc i (* (env ampf) add-fl)))))))))
;; (let* ((ifile "dog.snd")
;; (ofile "gmax_dog.snd")
;; (snd (find-sound ofile))
;; (number-ary '(1 2 4 9 12 13)))
;; (if snd
;; (close-sound snd))
;; (with-sound (:play 1 :statistics #t :channels 4 :output ofile :reverb jc-reverb
;; :comment
;; (format #f "maxfilter test, filters ~S, source ~A" number-ary ifile))
;; (do ((i 0 (+ 1 i))
;; (nary number-ary (cdr nary)))
;; ((null? nary))
;; (maxfilter ifile i :numf (car nary) :degree (random 3454)))))
;; (with-sound () (maxfilter "dog.snd" 0))
;; (with-sound (:srate 44100) (maxfilter "dog.snd" 0 :numf 12))
;; (with-sound (:srate 44100) (maxfilter "dog.snd" 0 :numf 13 :att 0.75))
;; (with-sound (:srate 44100) (maxfilter "dog.snd" 0 :numf 2 :att 0.25 :freqfactor 0.5))
;; maxf.scm ends here
|
