Xaoc Devices JENA Operator's Manual page 6

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fig. 4
distortions of wavetable sinusoid signal resulting
from inaccurate scanning of the cycle
external or internal clock as well as to select
between asynchronous and synchronous re-
gimes, press and hold the encoder knob for
a second. The display then shows e or i on
the first digit to indicate the clock source,
and a semi-graphical representation of the
signal model (rising or falling ramp) or off
(indicating asynchronous operation). Turn
the encoder knob to cycle between all combi-
nations of settings, and press again to select.
transfOrm banKs
Jena offers 15 banks of digital transform
data. Please refer to the online version of the
manual for a detailed list with diagrams. The
first 11 banks (numbered 0 to 9, and a) are
wavetables intended mostly for audio wave-
form generation. Each wavetable contains
256 smoothly morphing waves that are ar-
ranged circularly so that there is no audible
step while jumping from wave 255 to 0. The
wavetables have been carefully designed to
suit various sound synthesis needs. For exam-
ple, bank 7 contains smooth curves consist-
ing of low-order Chebyshev polynomials (fig.
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underscan
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overscan
5) that are well-suited for experiments with
deep, through-zero phase modulation, while
bank 0 contains waveforms with distinctive
human speech formants.
Some banks are specifically designed for ef-
ficient warping of CV signals, like LFO wave-
forms or simple envelopes. For example, bank
b features a simple shape that gradually
morphs between linear ramp through trian-
gle to inverted ramp, while bank c introduces
an increasing number of symmetric as well
as asymmetric folds to an initially linear
(1:1) transform.
A special bank d contains a very particular
set of waveforms. Besides being interesting
shapes, each of them is a combination of 8 so-
called Walsh functions. Similar to sinusoids,
these semi-rectangular functions (fig. 6)
can be used for additive synthesis. We have
selected 256 different Walsh combinations
that are generated at the individual binary
outputs of Jena, and at the same time, their
sum with corresponding factors (A
A =1/4, A =1/8, A
6 5
main output signal.
6
Scanning signal
Output waveshape
imperfect edge
=1/16... etc.) yields the
4
=1/2,
7