analog synthesizers
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Analog SynthesizersAnalog Synthesizers
Yohahn JoSystems Engineering
Class of 2011
Analog SynthesizerAnalog Synthesizer60s ~ 80sWave generating machineoutputs soundThrough filters sounds are
modified
Basic FeaturesBasic FeaturesVoltage Controlled OscillatorVoltage Controlled FilterVoltage Controlled AmplifierMixer
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
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
Envelop GeneratorEnvelop GeneratorTrigger and Gate signalsAttack Decay Sustain Release
(ADSR)
http://www.scottliddell.com/uploaded_images/adsr-725469.png
Sample and HoldSample and HoldUses an internal clock to capture
a voltage level of the signal and hold it.
Other ModulesOther ModulesNoise GeneratorRing Modulator
◦Multiplies two signalsVoltage Processor
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
Classic PatchClassic Patch
VCO VCF VCA
Envelope GeneratorKeyboard
Gate Trigger
How To Make SoundsHow To Make SoundsAnalyze the sound in depth
◦Listen carefully to the detailsDecide which modules to useDraw a diagramTest
Drum MachineDrum MachineLow frequency (VCO)Noise generatorADSR Envelope generator
VCO VCF VCA
Envelope
Generator
Noise Generat
or
Sample and Hold
QuestionsQuestions
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
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