DOEPFER Quad AD/LFO A-143-1 Manual - Página 2

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Quad AD/LFO A-143-1

2. Basic Principles

Fig. 2 shows the basic function of each unit:

Fig. 2: Basic function

The positive edge of the trigger input starts the envelope

signal and resets the "End of Attack (EOA)" output. The time

for the rising slope of the envelope is defined by the Attack

control. As soon as the maximum value (about +8 V) is

reached, the EOA output is set to "high" and the decay state

begins. The time for the falling slope of the envelope is

defined by the Decay Control.

System A-100

The threshold setting defines the behaviour of the

Comparator output (Cp Out). This output turns "low" as soon

as the level of the envelope signal exceeds the threshold

level. Otherwise it's high.

Both digital outputs EOA and Cp Out can be used to trigger

other A-100 modules or other units of the A-143-1.

The retrigger behaviour of the A-143-1 is different compared

to other envelope generators. During the rising slope of the

envelope (attack phase) the envelope cannot be retriggered

or reset. And during the falling slope (decay phase) the

direction changes if a trigger signal appears (changes from

decay to attack state).

Fig. 3: Retrigger behaviour

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