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System A - 100

Subharmonic Generator

A-113

1. Introduction

Module A-113 (Subharmonic Generator) is an addi-

tional sound source that derives four independend

so-called Subharmonics from an incoming pulse si-

gnal. The module represents the sound generation

core of the

Mixtur-Trautonium

introduced by

Oskar

Sala (ref. chapter 6).

Subharmonic means in this context a sawtooth wave

whose frequency is derived from a master frequency.

The master frequency is divided by an integer 1...24 to

obtain the subharmonic. The subharmonics are avai-

lable as 4 single outputs as well as mix output with

adjustable level for each subharmonic.

The integer

divisor

for each subharmonic is set with

up/down buttons. The current divisors are displayed

with four 2-digit LED displays.

The combination of 4 divisors is called

mixture

. 4

mixtures form a preset. 50 presets can be stored and

called up within the module.

Two gate inputs are available to switch between the

4 mixtures within one preset (controlled by any gate

signals, e.g. from foot controllers).

Attention ! The A-113 module requires an additional

+5V power supply with 100mA (e.g. the separate +5V

power supply or the +5V low-cost adapter)

A-113

Subharmonic Generator

Freq.

Mix

Out

Dow n

8.8.

Out 1

Level

Dow n

8.8.

Level

Dow n

8.8.

Foot

Ctr. 1

Foot

Ctr. 2

Preset

Dow n

8.8.

Level

Out 4

Out 2

Store

Level

Out 3

Summary of content (14 pages)

PAGE 1
System A - 100 doepfer Subharmonic Generator A-113 1. Introduction A-113 Subharmonic Generator 1 Up 8.8. Down 2 Up 8.8. Down 3 8.8. Level Out 1 Level Out 2 Level Down Out 3 Store 4 Level Up Up 8.8. Down Out 4 Preset Freq. Foot Foot Mix Ctr. 1 Ctr. 2 Out In Attention ! The A-113 module requires an additional +5V power supply with 100mA (e.g.
PAGE 2
A-113 Subharmonic Generator System A - 100 2. Basic principles The Subharmonic Generator A-113 contains four times the following elements (see fig. 1) • digital frequency divider (rectangle outputs) with 2-digit display and up/down buttons for divisor adjustment • rectangle/sawtooth converter (with single output) • attenuator controlling the amount (i.e.
PAGE 3
System A - 100 doepfer Subharmonics The subharmonics result from integer division of the frequency of the input signal. The table in fig. 2 shows the frequencies and corresponding tone pitches of the resulting subharmonics 5 derived from an input signal with the tone pitch C (i.e. 523,2 Hz). Divisor Freq. [Hz] Subharmonic Generator A-113 It becomes apparent that the subharmonics are equivalent to the tones of the minor chord scale.
PAGE 4
A-113 Subharmonic Generator System A - 100 H The term "subharmonic" is not quite correct as the A-113 outputs are sawtooth waveforms in contrast to the sine waves used in the harmonics theory. A sawtooth wave has a marked harmonic spectrum with odd and even overtones in contrast to the sine wave which is a “pure” wave without overtones. For details concerning harmonic contents of different waveforms please refer to the A-110 or A-111 manual (VCO´s).
PAGE 5
System A - 100 doepfer Controls: 2. Overview ➃ ➂ ➁ ➀ A-113 1 Display : 2 Up : SHG Subharmonic Generator 8.8. 8.8. 8.8. 8.8. Subharmonic Generator A-113 Divisor Level Single Out 0 10 Single Out Level 0 10 Single Out Level Store 0 Single Out 4 0 In / Outputs: ➌ " Foot Ctr. 1 : 10 Level Preset ➋ Foot Ctr. In 2 3 Divisor 5 Preset : 6 Store : Foot Ctr. In 1 2 Divisor ➊ In 1 Divisor ➍ 3 Down : 4 Level : 10 ! In : § Foot Ctr.
PAGE 6
A-113 Subharmonic Generator System A - 100 3. Controls 1 Display This is the 2-digit LED display that shows the current value of the divisor. In addition the decimal points of the displays are used to display the current mixture (see fig. 5): • no decimal point is on: mixture "00" doepfer 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 Fig.
PAGE 7
System A - 100 doepfer 5 Preset While button 5 is operated one reaches the preset mode (see chapter 2 concerning the term preset). In this state the displays of the third and fourth frequency divider show “Pr" resp. the number of the preset currently selected (e.g. “45", see fig. 6a): 1 1 2 2 (a) 3 4 Fig.
PAGE 8
A-113 Subharmonic Generator System A - 100 4. In / Outputs The mixture is displayed with the decimal points (see chapter 3, fig. 5). ! In Socket ! is the subharmonic generator’s audio input. Connect up the signal you wish to use as master frequency signal (normally the rectangle output of a VCO). " Foot Ctr. In 1 • § Foot Ctr. In 2 The gate inputs " and § are used to select the mixture. Any gate type signals may be used (e.g. Foot Controller, Sequencer gate outputs, MIDI interface) (see fig. 7).
PAGE 9
doepfer System A - 100 5. User Examples Simulation of a Mixtur-Trautonium The Trautonium is an electronic musical instrument invented by Friedrich Trautwein in the thirties in Berlin, Germany, with enhancements made by Oskar Sala in the fifties which led to the well known MixturTrautonium. The Trautonium can be divided into two logical sub-units: the control unit and the sound generation unit.
PAGE 10
A-113 Subharmonic Generator System A - 100 Fig.
PAGE 11
doepfer System A - 100 Subharmonic Generator A-113 11
PAGE 12
A-113 Subharmonic Generator A -113 VC- Mixer XYZ Audio In 1 V CO MOD ext . CV In 1 A udio Out VCA VCA MOD 4 Trig Fig.
PAGE 13
doepfer System A - 100 Subharmonic Generator A-113 7. 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.
PAGE 14
A-113 Subharmonic Generator 14 System A - 100 doepfer