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<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out Audio in No messages
-odac -iadc -d ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o syncphasor-CZresonance.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
; by Anthony Kozar. February 2008
; http://www.anthonykozar.net/
; Imitation of the Casio CZ-series synthesizer's "Resonance" waveforms
; using a synced phasor to read a sinusoid table. The jumps at the sync
; points are smoothed by multiplying with a windowing function controlled
; by the master phasor.
; Based on information from the Wikipedia article on phase distortion:
; http://en.wikipedia.org/wiki/Phase_distortion_synthesis
; Sawtooth Resonance waveform. Smoothing function is just the inverted
; master phasor.
; The Wikipedia article shows an inverted cosine as the stored waveform,
; which implies that it must be unipolar for the smoothing to work.
; I have substituted a sine wave in the first phrase to keep the output
; bipolar. The second phrase demonstrates the much "rezzier" sound of the
; bipolar cosine due to discontinuities.
instr 1
ifreq = cpspch(p4)
initReson = p5
itable = p6
imaxamp = 10000
anosync init 0.0
kslavecps line ifreq * initReson, p3, ifreq
amaster, async syncphasor ifreq, anosync ; pair of phasors
aslave, async2 syncphasor kslavecps, async ; slave synced to master
aosc tablei aslave, itable, 1 ; use slave phasor to read a (co)sine table
aout = aosc * (1.0 - amaster) ; inverted master smoothes jumps
adeclick linseg 0.0, 0.05, 1.0, p3 - 0.1, 1.0, 0.05, 0.0
out aout * adeclick * imaxamp
endin
; Triangle or Trapezoidal Resonance waveform. Uses a second table to change
; the shape of the smoothing function. (This is my best guess so far as to
; how these worked). The cosine table works fine with the triangular smoothing
; but we once again need to use a sine table with the trapezoidal smoothing.
; (It might be interesting to be able to vary the "width" of the trapezoid.
; This could be done with the pdhalf opcode).
instr 2
ifreq = cpspch(p4)
initReson = p5
itable = p6
ismoothtbl = p7
imaxamp = 10000
anosync init 0.0
kslavecps line ifreq * initReson, p3, ifreq
amaster, async syncphasor ifreq, anosync ; pair of phasors
aslave, async2 syncphasor kslavecps, async ; slave synced to master
aosc tablei aslave, itable, 1 ; use slave phasor to read a (co)sine table
asmooth tablei amaster, ismoothtbl, 1 ; use master phasor to read smoothing table
aout = aosc * asmooth
adeclick linseg 0.0, 0.05, 1.0, p3 - 0.1, 1.0, 0.05, 0.0
out aout * adeclick * imaxamp
endin
</CsInstruments>
<CsScore>
f1 0 16385 10 1
f3 0 16385 9 1 1 270 ; inverted cosine
f5 0 4097 7 0.0 2048 1.0 2049 0.0 ; unipolar triangle
f6 0 4097 7 1.0 2048 1.0 2049 0.0 ; "trapezoid"
; Sawtooth resonance with a sine table
i1 0 1 7.00 5.0 1
i. + 0.5 7.02 4.0
i. + . 7.05 3.0
i. + . 7.07 2.0
i. + . 7.09 1.0
i. + 2 7.06 12.0
f0 6
s
; Sawtooth resonance with a cosine table
i1 0 1 7.00 5.0 3
i. + 0.5 7.02 4.0
i. + . 7.05 3.0
i. + . 7.07 2.0
i. + . 7.09 1.0
i. + 2 7.06 12.0
f0 6
s
; Triangle resonance with a cosine table
i2 0 1 7.00 5.0 3 5
i. + 0.5 7.02 4.0
i. + . 7.05 3.0
i. + . 7.07 2.0
i. + . 7.09 1.0
i. + 2 7.06 12.0
f0 6
s
; Trapezoidal resonance with a sine table
i2 0 1 7.00 5.0 1 6
i. + 0.5 7.02 4.0
i. + . 7.05 3.0
i. + . 7.07 2.0
i. + . 7.09 1.0
i. + 2 7.06 12.0
e
</CsScore>
</CsoundSynthesizer>
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