Doepfer A-110 Standard VCO User Manual download pdf (Page 3)

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System A - 100

VCO

A-110

3. Basics

Module A-110 puts out four waveforms simultaneously.

All these signals have the same pitch, since all are

controlled by the same voltages present at inputs "

and §.

Sawtooth

The VCO’s sawtooth waveform is present at output &.

It has a ‘cutting’ sound, rich in overtones. All the

harmonics of the fundamental are present, with a linear

reduction in intensity as the harmonic series progres-

ses - so that the second harmonic is half as

Fig. 1: Harmonic spectrum of a sawtooth

strong, the third is one third, the fourth a quarter, and

so on (see Fig. 1).

Sawtooth waves are ideal for synthesizing sounds

which are rich in harmonics, such as percussion, brass

or vocal timbres.

Square wave

The VCO produces a square / rectangle wave at output

/. You can alter its pulse width manually, or by voltage

control (Pulse Width Modulation).

Fig 2: Square waves with different pulse widths

Harmonics

➨

100%

1/f 1/f

1 2 3 4 5 6 7 8 ... 11 12

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Doepfer A-110 Standard VCO User Manual Page 3