Doepfer A-128 User Manual
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Audio
In
A-128
Fixed
Filter
Bank
Audio
Out
50 Hz
75 Hz
110 Hz
11 kHz
System A - 100
1. Introduction
Module A-128 (Fixed Filter Bank) is a filter bank,
made up of
fixed middle frequencies and bandwidth:
50 Hz 350 Hz 2.2 kHz
75 Hz 500 Hz 3.6 kHz
110 Hz 750 Hz 5.2 kHz
150 Hz 1.1 kHz 7.5 kHz
220 Hz 1.6 kHz 11.0 kHz.
Each band pass filter has its own amplitude control
knob, with which that frequency band can be attenuated. The bandwidth of each of the filters is approximately half an octave.
The signal at the output of the A-128 contains a mix of
all the filters, depending on the position of each one’s
amplitude control knob.
The filter bank’s main job is to emphasise individual
sections of the whole audio frequency range. It’s like
a passive 15-band EQ.
Fixed Filter Bank
15 parallel band pass filters
A-128
, all with
1
A-128
Fixed Filter Bank
System A - 100
doepfer
2. A-128 - Overview
A-128
Audio In
0
0
0
0
Audio Out
0
FIXED FILTER BANK
50
10
0
75
10
0
110
10
0
150
10
0
220
10
0
Controls:
50 ... 11000 : Amplitude controls (attenuators) for
1
the individual band pass filters
350
10
500
10
750
10
1100
10
1600
10
2200
10
0
3600
10
0
5200
10
0
7500
10
0
11000
10
0
In / Outputs:
!
Audio Out : Signal output
"
➀
Audio In
: Signal input
2
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