Yamaha PLG150AN Owner's Manual download pdf (Page 7)

Analog Physical Modeling Synthesis and the PLG150-AN Tone Generator

PLG150-AN Tone Generator Block Diagram

VCO

The VCO module is where the original sound waveform is generated. In general, the VCOs of analog

synthesizers feature the simple waveforms shown below.

In theory, these waveforms are very simple; in the real world, they’re not so simple. Because of the

characteristics of electronic circuits, all analog synthesizers introduce subtle imperfections into the

waveform. These imperfections result in slightly rounding off the edges of the wave, or adding noise,

and other artifacts — and they give each synthesizer its own special, unique sound.

Although a single oscillator is enough to generate the basic sawtooth, pulse (square) or other waves

required for different types of musical instrument sounds, the PLG150-AN’s VCO module provides

far greater ﬂexibility. The PLG150-AN’s digital VCO creates mathematically exact waveforms.

FEG AEG

Distortion

Effects

3-Band EQVCF

VCO1

Oscillator Sync

Oscillator

Sync

MIXER

LFO1 & LFO2

Ring

Modulator

Noise

Feedback

Slave

VCO2

Master

PEG

VCA

Saw (Sawtooth) Pulse (Square) Triangle

Basic sawtooth waveform Basic pulse waveform Basic triangle waveform

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Yamaha PLG150AN Owner's Manual Page 7