Doepfer A-125 Bedienungsanleitung


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doepfer System A - 100 VC Phaser A-125
1
1. Introduction
Module A-125 (VC Phaser) is a voltage controlled
phase shifter.
Phase shifting can be controlled either manually or by
voltage control.
Other parameters which can be controlled are reso-
nance (governing the depth of the comb filtering, and
tonal color - see page 3) and mix (the amount of the
original signal which is added to the phase-shifted
signal).
Audio
In
Mix
CV
Level
Audio
Out
CV 2
A-125
VCP
CV
Shift
Resonance
A-125 VC Phaser System A - 100 doepfer
2
2. VC Phaser - Overview Controls:
1 Level : Attenuator to control the level of the
signal at input !
2 Shift : Control for manually setting the
amount of phase shift
3 CV : Attenuator for the phase shift voltage
control signal at input "
4 Res. : Resonance control
5 Mix : Control for setting the amount of the
original signal added to the phase-
shifted signal
In / Outputs:
! Audio In : Audio input
" CV : Input for pitch-shift voltage control
§ Audio Out : Audio output
A-125 VCP
CV
Shift
CV
Res.
Mix
Level
Audio In
VC PHASE SHIFTER
0 10
010
010
0 10
0 10
Audio Out
doepfer System A - 100 VC Phaser A-125
3
3. Basic principles
The phasing process relies on dynamic comb filtering.
The comb filtering produces a series of gaps in the
audio spectrum (in Fig. 1, at 200 Hz, 1 kHz and 5
kHz), by the cancelling process which is created byha-
ving identical sounds 180° out of phase with each
other (or ‘inverted’).
Fig. 1: The principle of phasing
These zero points are continuously swept through the
audio spectrum, cancelling out different frequencies,
and producing the characteristic phasing sound.
The principle can be explained by looking at the dia-
gram (Fig. 2) of a phaser created by three band pass
filters. Here, audio is input to the three filters BP1 to
BP3 (notch filters also work), set to different middle
frequencies. A slow LFO modulates the frequencies.
The outputs of the band pass filters are then mixed
with the original signal. Because of the phase reversal
inherent in the filter design (most apparent close to the
middle frequency), different areas of the audio
spectrum are cancelled out.
Fig. 2: A phaser model using separate modules
50 100 200 500 1k 2k 5k 10k 20k
Frequenz [Hz]
ÖÖÖÖ
BP 1
LFO
Mixer
Audio In
Out
f ~ 3 Hz
f = x Hz
c
BP 2
f = y Hz
c
BP 3
f = z Hz
c


Produktspezifikationen

Marke: Doepfer
Kategorie: Nicht kategorisiert
Modell: A-125

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