DOEPFER A-107 Handbuch - Seite 3

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2. Basic principles

Module A-107 consists of the 100% analog filter unit

with the parameters filter frequency, resonance/em-

phasis and amplification, and the digital control unit

with display, corresponding controls (buttons, rotary

encoder) and non-volatile memory.

The control unit manages the memory that contains

the 64 filter chains with 32 steps each. The control

unit is responsible for all parameters that refer to

switching and morphing of filters within the selected

chain, the control of the analog filter unit to obtain the

desired filter and the memory management.

The buttons "Step" and "Filter" determine if the display

shows the Step number (S) within the currenty selec-

ted filter chain (i.e. the so-called working buffer) or the

filter type (F).

The buttons "Chain" and "Prog" are used to transfer a

filter chain between the non-volatile memory (64 me-

mories) and the working buffer.

The values for Step, Filter and Chain are set by the

endless rotary encoder labelled "Value".

System A - 100

Provided that a clock signal is applied to the Step

Clock input the clocked mode is activated. In this

mode each positive transition of the clock signal trig-

gers the advance to the next step of the filter chain in

the working buffer. If step 32 is reached the next clock

switches back to step 1 of the chain.

Addressing the filters of the chain in the working

buffer can also be controlled by the manual step

control and/or an external control voltage at one of

the Step CV inputs. According to the manual setting

and the external voltage(s) the corresponding filter

within the chain is addressed.

For both the clocked and CV addressed mode the

transition time between succeeding filters can be con-

trolled manually by the Morphing control and/or an

external control voltage at one of the Morphing CV

inputs.

Attention: CV addressing "overruns" the filter selected

in the clocked mode.

All parameters can be controlled resp. modulated by

different voltages at the same time: filter step, mor-

phing time, filter frequency, resonance and amplifi-

cation.

Multitype Morphing Filter

A-107