<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
;-odac           -iadc     ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o cell.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
; cell.csd by Gleb Rogozinsky

sr        = 44100
kr        = 4410
ksmps     = 10
nchnls    = 1
0dbfs     = 1

; Cellular automaton-driven synthesis in spectral domain
instr 1

  iatt      = p4                                ; envelope attack time
  isus      = p5                                ; envelope sustain time
  irel      = p6                                ; envelope release time
  ivol      = p7                                ; overall volume
  
  ; create some white noise
  asig      rand      0.8                      
  
  ; spectral analysis of asig
  fsig      pvsanal   asig, 2048, 1024, 2048, 0  ; get a vector of magnitudes
           
  ; calculate cellular automaton state
  kfreq     line      50, 5, 1                  ; variable CA triggering frequency
  ktrig     metro     kfreq                     ; trigger the CA to update cells
            cell      ktrig, 0, 3, 1, 2, 2048   ; cells are written into ftable 3 
                                                                        
                                                                         
  ; use current row of cells in spectral domain
  fmas      pvstencil fsig, 0, 1, 3             ; apply spectral mask 
  aout      pvsynth   fmas                      ; reconstruct time signal 
  
  ; apply envelope and out signal
  kenv      expseg    .001, iatt, 1, isus, 1, irel, .001
            out       aout*kenv*ivol
endin

</CsInstruments>
<CsScore>

; This example uses one-dimensional cellular automaton
; to produce structures in spectral domain

; We have to prepare initial row of cells.
; One alive cell is enough to produce a simple fractal,
; so two alivee cells will make structure more sophisticated
f1 0 2048 7 0 150 0 0 1 1 1 0 0 45 0 0 1 1 1 0 0

; The CA rule is used as follows:
; the states (values) of each cell are summed with their neighboring cells.
; Each sum is used as an index to read a next state of cell
; from the rule table.
; Let us try rule # 129 (LSB binary 1 0 0 0 0 0 0 1).
; This rule will produce a fractal structure for single active cell
; For more rules see http://mathworld.wolfram.com/ElementaryCellularAutomaton.html
f2 0 8 -2 1 0 0 0 0 0 0 1
; Try some different rules i.E. 254 (0 1 1 1 1 1 1 1) or 169 (1 0 0 1 0 1 0 1)

; Prepare the output table of ielements size
f3 0 2048 10 0

; Time to make it sound!
i1 0  13  0.3  7  3  1 
e

</CsScore>
</CsoundSynthesizer>