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A-137.1 |
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Wave
Multiplier |
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A-137
is a voltage controlled Wave Multiplier. The basic idea of a wave
multiplier is to multiply the waveform of an incoming signal (e.g.
triangle/saw/sine from a VCO) within one period of the waveform.
This leads to additional harmonics of the incoming signal. The
period and consequently the pitch of the signals remains unchanged
(in contrast to frequency multiplication e.g. with the PLL module
A-196). The A-137 works as a kind of "inverse low pass filter",
i.e. it adds a lot of harmonics to a signal that contains none or
only a few harmonics (e.g. sine or triangle waveform). In contrast
to that a low pass filter (e.g. A-120) removes harmonics from a
signal that contains a lot of harmonics (e.g. saw or rectangle
waveform). Consequently the best results are obtained in combination
with input signals poor in harmonics (e.g. sine or triangle). The
A-137 can be used with signals rich in harmonics too (e.g. saw) but
the effect is not as effective as for triangle or sine waves. For
rectangle signals none or only little effect is achieved. The A-137
is a very sophisticated wave multiplier that offers much more
features, more controls and more waveform manipulations than other
wave multipliers available so far. In addition all parameters are
both manually adjusted and controlled by external voltages.
The Multiples parameter (manual and ext. CV) defines the number of
basic wave multiplications within one period. With the Folding Level
and Symmetry parameter (both manual and ext. CV) the upper and lower
clipping levels of the wave folder units are controlled. The
Harmonics parameter (manual and ext. CV) adds some harmonic content
by sharpening the waveform edges and adding overshoot peaks. It
works a little bit like the resonance control of a VCF. The module
is fully DC coupled, i.e. even control signal can be processed with
the modules.
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Width
14 HP |
Depth
65 mm |
Current
40 mA |
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Owners
Manual A-137.1 |
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