A-113
Subharmonic Generator
System A - 100
doepfer
4
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 harmo-
nics theory. A sawtooth wave has a marked
harmonic spectrum with odd and even overto-
nes in contrast to the sine wave which is a
“pure” wave without overtones. For details con-
cerning harmonic contents of different wa-
veforms please refer to the A-110 or A-111
manual (VCO´s).
We wanted to use the same terms as Oscar
Sala in his
Mixtur Trautonium
and this is why
we call the outputs of the A-113
subharmonics
though they are sawtooth outputs.
Mixture
The combination of four subharmonics is called a
mixture
.
Four different mixtures
("00", "01", "10" und
"11") are available but only
one mixture
is
active
at a
time. The original Mixtur-Trautonium had only three
mixtures available but due to the binary structure of the
A-113 we introduced 4 mixtures.
The active mixture is selected by the current state of
the two
gate control inputs
. In the original Mixtur-
Trautonium 2 foot switches mounted left and right of
the volume foot controller are used to switch between
the 3 mixtures.
Preset
A
preset
consists of 4 mixtures with 4 divisors each
(see fig. 4). 50 presets can be stored and called up
within the A-113 module. The original Mixtur-
Trautonium had no presets available. Each mixture
had to be changed manually.
Fig. 4
: Structure of a preset
T1
T1
T1
T1
divisor
T2
T2
T2
T2
(display)
T3
T3
T3
T3
T4
T4
T4
T4
mixture
"00" "01" "10" "11"
