Doepfer A-120 Bruksanvisning

Doepfer Inte kategoriserad A-120

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doepfer System A - 100 VCF 1 A-120
1
1. Introduction
Module A-120 (VCF 1) is a voltage controlled low-
pass filter, which filters out the higher parts of the
sound spectrum, and lets lower frequencies pass
through.
The Cut-Off Frequency determines the point at which
filtering takes effect. You can control this manually, or
by voltage control (filter modulation, for instance by
an LFO). Three CV inputs are available, and the sum
of the voltages from these affects the filter cut-off.
VCF1 is a co-called "transistor ladder" design, with a
cut-off slope of -24 dB/octave, as in various Moog
synthesizers. That’s what gives it its classic, legendary
Moog sound.
Resonance (or Emphasis) is adjustable all the way up
to self-oscillation - in which case the filter behaves like
a sine wave oscillator.
CV 1
Resonance
CV 3
CV 2
Audio In
Lev el
Audio
Out
CV 2
Frequency
A-120
VCF 1
CV 3
A-120 VCF 1 System A - 100 doepfer
2
2. VCF 1 - Overview Controls:
1 Freq.: Cut-off frequency control
2 CV 2: Attenuator for CV at input "
3 CV 3: Attenuator for CV at input §
4 $ Lev.: Attenuator for audio input
5 Res.: Control for setting the filter’s reso-
nance (emphasis)
In / Outputs:
! CV 1: Voltage control input
" CV 2: ditto, level controlled by 2
§ CV 3: ditto, level controlled by 3
$ Audio In: Input to the filter
% Audio Out: Output from the filter
A-120
VCF 1
CV 2
CV 3
Audio In
CV 2
CV 3
Lev.
Res.
Freq.
CV 1
➀
➁
➂
➃
➄
LOW PASS FILTER
0 10
010
010
0 10
0 10
Audio Out
doepfer System A - 100 VCF 1 A-120
3
3. Controls
1 Freq.
With this control you adjust the Cut-Off Frequency fc,
above which the filter attenuates all frequencies. At 10,
the filter is fully open. The more you turn down this
control, the more the high frequencies are filtered.
The sound becomes mellower and less bright (see
Fig. 1) until at 0 the filter is completely shut, and there
will be no output signal at all.
Fig. 1: White noise put through a low pass filter.
2 CV 2 • 3 CV 3
For voltage control or modulation of the cut-off fre-
quency, use these CV inputs " and/or § (see Fig. 1).
Use attenuators 2 and/or to adjust the3 control
voltage level.
4 Lev.
Use this attenuator to control the amount of signal
entering the filter input $.
H If the filter’s output distorts, turn this control
down, unless you deliberately want the
sound as a special effect.
5 Res.
With this control you adjust the filter’s resonance
(emphasis) - the parameter which emphasises the
frequencies around the cut-off point fC (see Fig. 2 on
p.4).
Close to its maximum setting, the filter becomes so
resonant that it goes into self-oscillation, and starts
behaving like a sine wave. You can take advantage
of this effect, and use the VCF as an additional oscilla-
tor.
f
c
CV
Out Out
Freq. Freq.
f
c

Produktspecifikationer

Varumärke: Doepfer
Kategori: Inte kategoriserad
Modell: A-120

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