Doepfer A-114 User Manual
doepfer
System A - 100
1. Introduction
Dual Ring Modulator A-114
A-114
RING MOD.
X IN
Y IN
X • Y OUT
X IN
Y IN
X • Y OUT
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 modulation will output the original carrier frequency f
well as the two side bands (f
- fM, fC + fM) for each of
C
C
as
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.
1
A-114
Dual Ring Modulator
System A - 100
2. Dual Ring Modulator - Overview
A-114
RING MOD.
➊
X IN
In / Outputs:
! X In : Signal input
"
X*Y Out : Output
§
: Signal input
Y In
doepfer
➋
➌
2
Y IN
X • Y
OUT
RING MOD.
X IN
Y IN
X • Y
OUT
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