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System A - 100

VC Waveform Processor A-116

1. Introduction

Module A-116 (Voltage Controlled Waveform Pro-

cessor)

provides

voltage-controlled dynamic wa-

veform modification of audio signals. It can produce

new waveforms from the standard VCO shapes, and

modulate these changes

in real time.

The signal first of all goes through an

input amplifier,

which can attenuate the signal as well as amplify it by

up to a factor of 2.

After the input amplifier, the signal goes through

two

parallel processors: a clipping circuit, and an

asymmetrical amplifier. The processed signals are

added together

and sent to the output.

Clipping-Level

and

Symmetry

amounts are not just

manually controllable, but can also be modulated by

control voltages, to produce complex, constantly chan-

ging waveforms.

Clipping

CCV

Symm. CV

Audio Out

Audio In

A-116

VCW

Clipping

Level

Lev.

SCV

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer VC Waveform Processor A-116 1. Introduction A-116 Lev. VCW Audio In CCV Clipping CV SCV Symm. CV Audio Out Clipping Level Module A-116 (Voltage Controlled Waveform Processor) provides voltage-controlled dynamic waveform modification of audio signals. It can produce new waveforms from the standard VCO shapes, and modulate these changes in real time.
PAGE 2
A-116 VC Waveform Processor System A - 100 2. VC Waveform Processor - Overview A-116 VCW VC Waveform Processor Audio In ➊ Lev. 0 10 0 10 Clipping Level ➀ ➁ Clipping CV ➋ CCV 0 ➂ 10 Symm. CV ➌ SCV 0 ➃ 10 Audio Out ➍ Sym. 0 2 10 ➄ doepfer Controls: 1 Lev. : Input ! amplifier level control 2 Clipping Level : Clipping threshold control 3 CCV : Clipping CV attenuator 4 SCV : Symmetry CV attenuator 5 Sym.
PAGE 3
doepfer System A - 100 3. Controls 1 Lev. The input amplifier’s gain can be set with attenuator 1. Since the gain amount is variable from 0 up to a factor of 2, you can attenuate as well as amplify input signals. 2 Clipping Level VC Waveform Processor A-116 metry VCA is a special amplifier which operates in the amplification range from -1 to +1, so can amplify negative as well as positive voltages (see Fig. 2).
PAGE 4
A-116 VC Waveform Processor System A - 100 1.0 (Input Signal) 5. User examples 0.75 0.5 0 0.25 - 0.25 - 0.5 - 0.75 - 1.0 Fig. 2:In this example, a triangle wave is symmetrically amplified by the internal symmetry VCA, with various gain factors from 1.0 to -1.0 4. In / Outputs ! Audio In Socket ! is the A-116 audio input. " Clipping CV The input to use for voltage control of the clipping threshold. § Symm. CV The input to use for voltage control of symmetry.
PAGE 5
System A - 100 doepfer • • VC Waveform Processor A-116 LFO (sine wave) for Symmetry, LFO (square wave) for Clipping Level VCO RANDOM for Clipping Level, Modulation wheel for Symmetry etc. CV D Try the same experiments with more complex (rich in harmonics) waveforms like a square wave, sawtooth, PWM, FM, or ring modulated sounds, or external audio, for the input signal. Listen to the results and take note. D patch the original signal and the A-116’s output into a mixer.
PAGE 6
A-116 VC Waveform Processor System A - 100 doepfer v=1 v = 0.5 Input Signal Signal after Clipping v=0 Sum Up v = -0.5 v = -1 Fig. 4: 6 Example of how the A-116 processes a triangle wave with a constant clipping level and variable symmetrical amplifier levels.