Instruction Manual

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System A - 100

Dual Ring Modulator A-114

1. Introduction

Module A-114 (Dual Ring Modulator) contains two

separate

ring modulators

A ring modulator outputs the product (Multiplication X •

Y) of the signals at inputs X and Y. It’s similar to a

VCA, but whereas a VCA only responds to positive

voltages at the inputs (2-quadrant multiplication), the

ring modulator responds to both positive and negative

voltages (4-quadrant multiplication).

The ring modulator thus provides a refinement of

amplitude modulation (AM). Ordinary amplitude modu-

lation will output the original carrier frequency f

well as the two side bands (f

- f

, f

+ f

) for each of

the spectral components of the carrier and modulation

signals - but ring modulation cancels out the carrier

frequencies, and just lets the side-bands pass to the

output (see Fig. 1).

A ring modulator is used for the production of bell-like

sounds, alien voices, or just to produce new timbres.

X IN

A-114

Y IN

X • Y OUT

X IN

Y IN

X • Y OUT

RING MOD.

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer Dual Ring Modulator A-114 1. Introduction A-114 Module A-114 (Dual Ring Modulator) contains two separate ring modulators. RING MOD. X IN Y IN X • Y OUT X IN Y IN X • Y OUT A ring modulator outputs the product (Multiplication X • Y) of the signals at inputs X and Y. It’s similar to a VCA, but whereas a VCA only responds to positive voltages at the inputs (2-quadrant multiplication), the ring modulator responds to both positive and negative voltages (4-quadrant multiplication).
PAGE 2
A-114 Dual Ring Modulator System A - 100 doepfer 2. Dual Ring Modulator - Overview In / Outputs: A-114 RING MOD. ➊ X IN ➋ Y IN ➌ X•Y OUT RING MOD.
PAGE 3
System A - 100 doepfer Dual Ring Modulator A-114 3. In / Outputs 4. User examples ! X In Basic ring modulation • " Y In Sockets ! and " are the signal inputs for the A-114. Patch the signals you would like to ring modulate into these sockets. The inputs need to have AC signals - so you should use audio signals, not control voltages. For control voltages, use a VCA. § X*Y Out Socket § is the ring modulator Output. Fig. 1 shows a basic form of ring modulation using two sine waves.
PAGE 4
A-114 Dual Ring Modulator System A - 100 Ring modulation of audio signals A ring modulator is very good at doing weird things to audio signals (for instance, voices, strings, sax). The example at Fig. 2 shows an audio signal (input via module A-119 "Ext. In") ring modulated with a sine wave. The spectrum at the output contains the sum and difference of the frequency of the sine wave with every single one of the components of the audio signal’s sound spectrum.
PAGE 5
System A - 100 doepfer “Glissando ring modulation” The patch in Fig. 3. produces some interesting sounds. Input two VCOs set to an exact harmonic interval (eg. a fifth or octave) into the ring modulator. Send the pitch CV direct to the first VCO, but run the second oscillator’s CV through the upper section of the slew limiter (A-170) first. H Dual Ring Modulator A-114 Use the upper part of the A-170 for this, because the diode offset in the lower part wlll put the VCO out of tune.
PAGE 6
A-114 Dual Ring Modulator System A - 100 doepfer 5. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system. Make multiple copies of your composite diagram, and use them for remembering good patches and set-ups.