Doepfer A-137-1 Wave Multiplier User Manual download pdf

doepfer

System A - 100

Waveform Multiplier

A-137

1. Introduction

Module A-137 is a Voltage Controlled Waveform Mul-

tiplier. The basic idea of a wave multiplier is to multiply

the waveform of an incoming signal (e.g. triangle from

a VCO) within one period. This leads to additional

harmonics. The period and consequently the pitch of

the signals remains unchanged - in contrast to fre-

quency multiplication e.g. with the PLL module A-196.

The A-137 works as a kind of "

inverse low pass filter

i.e. it adds a lot of harmonics to the incoming signal.

Consequently the best results are obtained with signals

that contain none or only a few harmonics (e.g. triangle

or sine waveforms). The A-137 can be used with signals

rich in harmonics too (e.g. saw) but the effect is not as

remarkable as for triangle or sine waves.

The A-137 is a very sophisticated wave multiplier that

offers much more features, more controls and more

waveform manipulations than other wave multipliers

available so far. In addition all four parameters are both

manually adjusted and controlled by external volta-

ges:

• Multiples: number of waveform multiplications

• Harmonics: adds more harmonics similar to the re-

sonance/emphasis control of filters

• Folding Level/Symmetry: value and symmetry of

the upper/lower folding level

1 2 3 4 5 6

Summary of Contents

Page 1 - 1. Introduction

doepferSystem A - 100Waveform Multiplier A-13711. IntroductionModule A-137 is a Voltage Controlled Waveform Mul-tiplier. The basic idea of a wave m

Page 2 - 2. Basic principles

A-137 Waveform Multiplier System A - 100doepfer22. Basic principlesThe signal is processed by a standard linear VCA and 4so-called wave folding

Page 3

doepferSystem A - 100Waveform Multiplier A-1373As the amplification resp. the Multiples parameter in-creases even the peaks of the folded signal rea

Page 4 - 3. Overview

A-137 Waveform Multiplier System A - 100doepfer4Controls:1a CV Multiples: Attenuator for CV input !1b Man. Multiples: Manual Multiples control2a

Page 5 - 4. Controls

doepferSystem A - 100Waveform Multiplier A-13754. Controls1a CVM (knob) / ! CVM (socket)1b Manual Multiples (knob)This group of elements is respons

Page 6 - 5. User Examples

A-137 Waveform Multiplier System A - 100doepfer6& Out (socket)This is the audio output of the module. The output signalcan be processed by ot

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Doepfer A-137-1 Wave Multiplier User Manual

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