Doepfer A-113 Bedienungsanleitung
Doepfer
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A-113
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doepfer System A - 100 Subharmonic Generator A-113
1
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.
In
Up
Mix
Out
Down
8.8.
Out 1
Level
1
Up
Down
8.8.
Level
2
Up
Down
8.8.
3
Foot
Ctr. 1
Foot
Ctr. 2
Preset
Up
Down
8.8.
Level
4
Out 4
Out 2
Store
Level
Out 3
A-113 Subharmonic Generator System A - 100 doepfer
2
2. Basic principles
The Subharmonic Generator A-113 contains four ti-
mes the following elements (see fig. 1)
• digital frequency divider (rectangle outputs) with
2-digit display and up/down buttons for divisor adju-
stment
• rectangle/sawtooth converter (with single output)
• attenuator controlling the amount (i.e. the ampli-
tude) of the subharmonic in the mix output
The incoming signal (preferably the rectangle ouput of
a VCO) is fed into the four frequency dividers. The
frequencies of the rectangle signals generated by the
frequency dividers are determined by the current divi-
sors (1...24).
The rectangle outputs are converted to sawtooth wa-
veforms by means of the rectangle/sawtooth conver-
ters.
Fig. 1: Basic layout of the A-113
doepfer System A - 100 Subharmonic Generator A-113
3
Subharmonics
The subharmonics result from integer division of
the frequency of the input signal.
The table in fig. 2 shows the frequencies and corre-
sponding tone pitches of the resulting subharmonics
derived from an input signal with the tone pitch C 5 (i.e.
523,2 Hz).
Fig. 2: Subharmonics of a signal with tone pitch C 5
It becomes apparent that the subharmonics are equi-
valent to the tones of the minor chord scale.
By way of contrast the harmonics are equivalent to
the tones of the major chord scale. Harmonics are
integer multiples of the basic frequency (see fig. 3).
The undertone series (i.e. subharmonics) are the
mirror image of the overtone series (i.e. harmonics).
Fig. 3:Harmonics of a signal with tone pitch C 2
Divisor Freq. [Hz]
1 523,2 C5
2 261,6 C4
3 174,6 F3
4 130,8 C3
5 103,8 As2
6 87,3 F2
7 73,4 D2
8 65,4 C2
Note Factor Freq. [Hz]
1 65,4 C2
2 130,8 C3
3 196,0 G3
4 261,6 C4
5 329,6 E4
6 392,0 G4
7 466,1 B4
8 523,2 C5
Note
Produktspezifikationen
| Marke: | Doepfer |
| Kategorie: | Nicht kategorisiert |
| Modell: | A-113 |
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