Manual

ManualsBrandsDoepfer ManualsAudioA-118 Noise/Random

doepfer

System A - 100

NOISE / RANDOM A-118

1. Introduction

Module A-118 (NOISE / RANDOM) is (as you might

have guessed) a

noise and random voltage genera-

tor.

It produces three types of signal: white noise, colo-

red noise, and random voltage.

White and colored noise can be used as audio sour-

ces, and also, in conjunction with a sample & hold

module, as control voltages, and the random voltage is

a useful source of voltage control, especially for its low

frequency content.

The A-118 gives you the ability to mix the relative

amounts of

Red

(low frequency component) and

Blue

noise (high frequency component) in the colored noise

output.

There are knobs to control the

rate of change

and

amplitude of the random voltage, and two LEDs indi-

cate the state of the voltage at any one time.

Blue

Colored

Random

Output

Rate

White

A-118

NOISE / RANDOM

Random Control

- +

Red

Level

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer NOISE / RANDOM A-118 1. Introduction A-118 NOISE / RANDOM Whit e Blue Colored Red Rate Random Output Level Random Control + Module A-118 (NOISE / RANDOM) is (as you might have guessed) a noise and random voltage generator. It produces three types of signal: white noise, colored noise, and random voltage.
PAGE 2
A-118 NOISE / RANDOM System A - 100 2.
PAGE 3
System A - 100 doepfer 1 Blue 3. Controls The A-118 produces white and colored noise. White noise contains all audio frequencies, at random amplitude. The spectrum of white noise is completely flat ie. each section of the sound spectrum contains the same amount of energy (see Fig. 1). Another type of noise is pink noise. This also contains all audio frequencies, but with equal weighting for each octave rather than each frequency, so the higher frequencies get progressively quieter (see Fig. 1).
PAGE 4
A-118 NOISE / RANDOM System A - 100 doepfer 5 Random Control Use these two LEDs to keep track of whether the random voltage is positive (+) or negative (-) at any point in time. Their relative brightness also shows amplitude. Fig. 2: Random voltage with Rate = 0 4. Outputs ! White Output ! produces white noise. " Colored T Fig. 3: Random voltage with Rate = 10 4 Level The amplitude of the signal at output § is adjusted with this control.
PAGE 5
System A - 100 doepfer NOISE / RANDOM A-118 Random arpeggios 5. User examples The A-118 as wind FX generator D Patch the A-118 into an A-120 VCF as below. Set CV2 to zero, the frequency to a mid position, and the resonance to just below self-oscillation. D Now increase CV2’s level. An irregular wind sound should emerge. Knobs 3 and 4 on the A-118 control the rate of change and amount of this irregularity. 1 and 2 control the wind’s timbral content.
PAGE 6
A-118 NOISE / RANDOM System A - 100 doepfer 6. 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. A-118 NOISE / White Blue 0 Colored 0 6 • Draw in patchleads with colored pens.