Doepfer A-124 Handleiding

Doepfer Niet gecategoriseerd A-124

Lees hieronder de 📖 handleiding in het Nederlandse voor Doepfer A-124 (8 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 18 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

Pagina 1/8
doepfer System A - 100 Wasp Filter (VCF 5) A-124
1
1. Introduction
Module A-124 (WASP FILTER) is a special voltage-
controlled multimode filter with a cut-off slope of
-12dB / octave.
The special feature of the A-124 is the peculiar elec-
tronic circuitry of the Wasp synthesizer manufactured
at the end of the seventies by the UK company EDP
(Electronic Dream Plant). This synthesizer is well
known for its eye-catching black/yellow wasp design
and its distinctive filter. Its circuitry "abuses" digital
inverters as analog operational amplifiers leading to
distortions and other "dirty" effects that generate the
specific sound of this filter.
Our version is equipped with a band pass output and
a combined low/notch/high pass output. For this
latter output a control knob defines the relative
amounts of low and high pass signals. If both si-
gnals appear at the same level (i.e. middle position of
the Mix knob) one obtains a filter. Otherwise thenotch
low or high pass signal predominates.
Resonance can be adjusted manually. The filter can't
go into self oscillation, in contrast to most of the other
VCFs in the A-100 system.
The cut-off frequency can be adjusted manually, or
by voltage control. Two CV inputs are available.
Audio
In
CV 2
CV 2
BP Out
LP/HP Out
Res.
CV 1
A-124
WASP FILTER
Frq.
Lev el
Mix
A-124 Wasp Filter (VCF 5) System A - 100 doepfer
2
2. VCF 5 - Overview Controls:
1 Audio Level : Input signal attenuator
2 Frq. : Cut-off frequency control
3 § CV 2 : Attenuator for filter CV
4 Res. : Resonance control
5 Mix : Control for relative amounts of low
and high pass signal
In / Outputs:
! Audio In : Audio input to the filter
" CV 1 : Cut-off frequency CV input
§ 3 CV 2 : ditto, level controlled by
$ BP Out : Band-pass filter output
% LP/HP Out : Mixed low-pass / high-pass filter out-
put
A-124
VCF 5
CV 1
CV 2
Audio In
Frq.
CV 2
Res.
Mix
Lev.
➊
➋
➌
➍
➎
➀
➁
➂
➃
➄
WASP FILTER
0 10
010
010
0 10
LP HP
LP/HP Out
BP Out
doepfer System A - 100 Wasp Filter (VCF 5) A-124
3
3. Basics
Module A-124 contains three filter types: low-pass,
high-pass and band-pass. Low-pass and high-pass
signals are internally mixed and appear as the mixed
LP/HP output % 5. The mix control governs the
relative amounts of low-pass and high-pass.
With the mix control fully counterclockwise, at "LP",
the mix output forms a pure low-pass. This is the
most common type of filter in analogue sound produc-
tion, which filters out the higher parts of the sound
spectrum, and lets the lower frequencies pass un-
changed. Cut-off frequency fC determines the fre-
quency at which this occurs (see Fig. 1).
With the mix control fully clockwise, at ”HP”, the mix
output is a pure high-pass. The high-pass filter is a
mirror-image of the low-pass filter: while it lets fre-
quencies that are higher than the cut-off frequency fC
through, it attenuates frequencies below the cut-off
point (see Fig. 1).
With the mix control in its middle position, the result is
a symmetrical notch filter, letting through the upper
and lower end of the frequency spectrum, but rejec-
ting a band in the middle. If the mid-frequency is
modulated by an LFO, the result sounds very similar
to phasing.
Fig. 1: Typical response curves of the four filter types.
When the mix control deviates from the middle posi-
tion the , i.e. the low-pass ornotch is asymmetrical
high-pass share predominates.
In the band-pass filter, which has its own output, both
ends of the frequency spectrum are attenuated (see
Fig. 1), and the cut-off frequency fC becomes the mid
frequency. It gives you the ability to highlight a
particular frequency band.
fc
Out
Freq.
Out
Freq.
Low Pass High Pass
fc
fc
Freq.Freq.
Out Out
fc
Band PassNotch

Product specificaties

Merk: Doepfer
Categorie: Niet gecategoriseerd
Model: A-124

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