Download - Analog Synthesizers
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Analog SynthesizersAnalog Synthesizers
Yohahn JoSystems Engineering
Class of 2011
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Analog SynthesizerAnalog Synthesizer60s ~ 80sWave generating machineoutputs soundThrough filters sounds are
modified
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Basic FeaturesBasic FeaturesVoltage Controlled OscillatorVoltage Controlled FilterVoltage Controlled AmplifierMixer
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FiltersFilters
Use filters to modify the soundsThree commonly used filters: low
pass, high pass, band pass
http://www.hobbyprojects.com/general_theory/images/filter3.gif
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Example: Ideal Low Pass Example: Ideal Low Pass FilterFilterH(ω) = Frequency responseh(t) = impulse response
Sinc function extends to future and past times, therefore need an infinite delay to do the convolution
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Envelop GeneratorEnvelop GeneratorTrigger and Gate signalsAttack Decay Sustain Release
(ADSR)
http://www.scottliddell.com/uploaded_images/adsr-725469.png
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Sample and HoldSample and HoldUses an internal clock to capture
a voltage level of the signal and hold it.
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Other ModulesOther ModulesNoise GeneratorRing Modulator
◦Multiplies two signalsVoltage Processor
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Analog Synthesizers…Analog Synthesizers…Are hard to usegives much more options in
creating unique soundsReplaced by digital synthesizersDigital synthesizers are easier to
use, but there are limitations in producing a unique sound
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Classic PatchClassic Patch
VCO VCF VCA
Envelope GeneratorKeyboard
Gate Trigger
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How To Make SoundsHow To Make SoundsAnalyze the sound in depth
◦Listen carefully to the detailsDecide which modules to useDraw a diagramTest
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Drum MachineDrum MachineLow frequency (VCO)Noise generatorADSR Envelope generator
VCO VCF VCA
Envelope
Generator
Noise Generat
or
Sample and Hold
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QuestionsQuestions
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Works CitedWorks Citedhttp://www.intuitivedesigns.net/analog-
vs-digital-pros-and-cons-in-digital-technology/
http://cnx.org/content/m0028/latest/http://www.guitarfool.com/
ARP2600.htmlhttp://en.wikipedia.org/wiki/
Impulse_responsehttp://en.wikipedia.org/wiki/Low-
pass_filterClass Notes by H. Mukai