MUC4441/6445
Electroacoustic Music Composition/Digital I




Granular Synthesis

basic granular orchestra

                ;basicgrain.orc
; 70_01_1.orc ; synthesis: granular ; basic granular synthesis ; uniform pseudorandom selection of ; grain frequency, inter-grain time, ; and grain length ; coded: 6/95 RKP sr=48000 kr=480 ksmps=100 nchnls=1 instr 1 iamp = p4 ;amplitude of overall event ibpch = p5 ;basepch (center frequency) ibw = p6 ;bandwidth of random frequency variation of grains, ;1 = one semitone variation above and below the base frequency imiigt = p7 ;minimum inter-grain time imxigt = p8 ;maximum inter-grain time imigl = p9 ;minimum grain length imxgl = p10 ;maximum grain length iseed = p11 ;seed value for randh igefn = p12 ;grain envelope function number ;inter-grain time: uniform pseudorandom selection between imiigt and imxgt kr1 randh (imxigt-imiigt)/2,1/imiigt,iseed kigt = imiigt+ (kr1+((imxigt-imiigt)/2)) ;grain length: uniform pseudorandom selection between imigl and imxgl kr2 randh (imxgl-imigl)/2,1/imiigt,iseed kgl = imigl+(kr2+((imxgl-imigl)/2)) ;grain cps random variation: uniform pseudorandom selection. ;mean = ibpch, range = (ibpch) + - ibw kvar randh ibw/12,1/imiigt,iseed ;envelope for overall event kenv linen iamp,p3*.1,p3,p3*.3 reset: timout 0,i(kgl)+i(kigt),contin reinit reset contin: andx line 0,i(kgl),4096 agenv tablei andx,igefn ioct = octpch(ibpch) icps = cpsoct(ioct+i(kvar)) a1 oscili agenv,icps,1 out a1*i(kenv) endin

basic granular score

                ;basicgrain.sco
                ;70_01_1.sco
                ;coded:   RKP  6/95

                ;iamp   amplitude of overall event
                ;ibpch  base pch (center frequency)
                ;ibw    bandwidth of random frequency variation of grains, 
                        ;1 = one semitone variation above and below  the base frequency
                ;imiigt minimum inter-grain time
                ;imxigt maximum inter-grain time
                ;imigl  minimum grain length
                ;imxgl  maximum grain length
                ;iseed  seed value for randh
                ;igefn  grain envelope function number



;  GEN functions
;  waveform
f1      0       4096    10      1       ;sine function for grain production

;grain envelope
f31     0       4096    7       0 1024 1 2048 1 1024 0

;score

;ins    strt    dur     iamp    ibpch   ibw     imiigt  imxigt  imigl   imxgl   iseed   igefn
i1      0       1       10000   9.09    1       .02     .1      .02     .05     .001    31
s
;ins    strt    dur     iamp    ibpch   ibw     imiigt  imxigt  imigl   imxgl   iseed   igefn
i1      0       1       10000   9.09    2       .02     .1      .02     .05     .001    31
s
;ins    strt    dur     iamp    ibpch   ibw     imiigt  imxigt  imigl   imxgl   iseed   igefn
i1      0       1       10000   9.09    3       .02     .1      .02     .05     .001    31
s
;ins    strt    dur     iamp    ibpch   ibw     imiigt  imxigt  imigl   imxgl   iseed   igefn
i1      0       1       10000   9.09    6       .02     .1      .02     .05     .001    31
s
;ins    strt    dur     iamp    ibpch   ibw     imiigt  imxigt  imigl   imxgl   iseed   igefn
i1      0       1       10000   9.09    12      .02     .1      .02     .05     .001    31
e

sample granular orchestra

;***********************************************************
;*                                                         *
;*                      samplegrain.orc                    *
;*                   w/melodic contour added               *
;*                                                         *
;***********************************************************
                ;  synthesis:   granular
                ;               basic granular sampling engine 
                ;               uniform pseudorandom selection of
                ;               grain start point, inter-grain time,
                ;               and grain length
                ;               w/ intergrain time change over event
                ;               w/ grain length change over event
                ;               w/ center freq change over event
                ;  coded:       7/95  JPS
                ;  based:       granular design by RK Parks   



                sr=48000
                kr=480
                ksmps=100
                nchnls=2

         instr 1
                itrnss  = p4    ;event pitch (start: 1000=@ orig pitch)
                itrnsf  = p5    ;event pitch (finish: 1000=@ orig pitch)
                iamp    = p6    ;amplitude of overall event
                imiigts = p7    ;minimum inter-grain time (start)
                imiigtf = p8    ;minimum inter-grain time (finish)
                imxigts = p9    ;maximum inter-grain time (start)
                imxigtf = p10   ;maximum inter-grain time (finish)
                imigls  = p11   ;minimum grain length (start)
                imiglf  = p12   ;minimum grain length (finish)
                imxgls  = p13   ;maximum grain length (start)
                imxglf  = p14   ;maximum grain length (finish)
                iseed   = p15   ;seed value for randh units
                irvars  = p16   ;random var around read pointer (start)
                irvarf  = p17   ;random var around read pointer (finish)
                ifns    = p18   ;sound file source table
                ismpsz  = p19   ;actual sample size
                ifnrp   = p20   ;line function for read pointer 
                ifnm    = p21   ;function for melodic contour
                ifnmt   = p22   ;number of repeats of melodic function/p3

                ;inter-grain time
                kmiigt  expseg imiigts,p3*.66,imiigtf,p3*.34,imiigts
                kmxigt  expseg imxigts,p3*.66,imxigtf,p3*.34,imxigts
                kr1     randh (kmxigt-kmiigt)/2,1/kmiigt,iseed
                kigt    = kmiigt+(kr1+((kmxigt-kmiigt)/2))

                ;grain length
                kmxgl   expseg imxgls,p3*.66,imxglf,p3*.34,imxgls
                kmigl   expseg imigls,p3*.66,imiglf,p3*.34,imigls
                kr2     randh (kmxgl-kmigl)/2,1/kmiigt,iseed
                kgl     = kmigl+(kr2+((kmxgl-kmigl)/2))

                ;envelope for random stereo placement over event duration:
                ;uniform pseudorandom selection
                kstr      randh .5,1/kmiigt,iseed

                ;read pointer
newvar:         krvar   expseg irvars,p3*.34,irvarf,p3*.66,irvars
                ktrns   expseg itrnss,p3*.34,itrnsf,p3*.66,itrnss
                kr4     oscil ktrns,ifnmt/p3,ifnm
                kr3     randh krvar*1000,1/kmiigt,iseed
                krpt    oscil1 0,1,p3*2.5,ifnrp
                kbegg   = (krpt*1000)*48+(kr3*48)
                kendg   = kbegg+((kgl*kr4)*48)

                ;amplitude of overall event
                kenv    linenr iamp,p3*.25,0,0.001

reset:          timout  0,i(kigt)+i(kgl),contin
                reinit  reset
contin:         if      i(kendg)>ismpsz goto null
                if      i(kbegg)<0 goto null
                andx    line  0,i(kgl),4096
                agenv   tablei  andx,81
                adyn    line i(kbegg),i(kgl),i(kendg)
                a1      tablei adyn,ifns,0,0,0
                outs1   (a1*agenv*kenv)*(i(kstr)+.5)
                outs2   (a1*agenv*kenv)*(1-(i(kstr)+.5))
null:           a2      = 0
                outs    a2,a2
endin

sample granular score

;***********************************************************
;*                                                         *
;*                      samplegrain.sco                    *
;*             run with samplegrain.orc                    *
;*                                                         *
;***********************************************************
                ;                coded: jps  7/95
                ;itrnss  = p4    event pitch (start: 1000=@ orig pitch)
                ;itrnsf  = p5    event pitch (finish: 1000=@ orig pitch)
                ;iamp    = p6    amplitude of overall event
                ;imiigt  = p7    minimum inter-grain time (start)
                ;imiigt  = p8    minimum inter-grain time (finish)
                ;imxigt  = p9    maximum inter-grain time (start)
                ;imxigt  = p10   maximum inter-grain time (finish)
                ;imigl   = p11   minimum grain length (start)
                ;imigl   = p12   minimum grain length (finish)
                ;imxgl   = p13   maximum grain length (start)
                ;imxgl   = p14   maximum grain length (finish)
                ;iseed   = p15   seed value for randh units
                ;irvar   = p16   random var around read pointer (start)
                ;irvar   = p17   random var around read pointer (finish)
                ;ismpsz  = p18   actual sample size
                ;ifns    = p19   sound file source table
                ;ifnrp   = p20   line function for read pointer

;GEN functions

;grain envelope
f81     0     4096    8     0 1024 1 2048 1 1024 0

;input source (substitute a sample of your here; check with the Csound manual for GEN1 options for various file formants)
f71     0     32769     1     "CLAR48A.aiff"     0     4     1     ;sample file

;line generators for read pointer
f31     0     4096    7       0   4096  1

;melody function (substitute your melodic sequence function here)
f32     0     4096    5    1.000 600 1.000 1 1.189 52 1.189 31 1.237 340 1.237 1 0.944 340 0.944 1 1.782 2730 1.782

;score
;*************************************************
; single line melodic fragment with clarinet sample
;*************************************************
;ins  strt  dur  itrnss  itrnsf  iamp  imiigts  imiigtf  imxigts  imxigtf  imigls  imiglf  imxgls  imxglf  iseed  irvars  irvarf  ifns  ismpsz  ifnrp  ifnm
i1    0     6    1000    1000    2000  .005     .01      .01      .1       .02     .04     .05     .1      .001   .001    .1      71    30948   31     32
e

- last update 16 September 2019 -