Doepfer A-143-1 Handleiding

Doepfer Niet gecategoriseerd A-143-1

Lees hieronder de 📖 handleiding in het Nederlandse voor Doepfer A-143-1 (8 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 43 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

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DOEPFERDOEPFERDOEPFERDOEPFER System A-100 Quad AD/LFO A-143-1

Fig. 1: A-143-1 Controls, Inputs and Outputs

1. Introduction

Module A-143-1 contains four independent Attack/Decay

generators. When the module is used as a complex

envelope generator, then two, three or four units are daisy-

chained, i.e. the preceding unit triggers the following unit.

But the four units can be used even as four separate AD

generators (mode switch in position AD) or free-running AD-

type LFOs (mode switch in position LFO). The LFO mode

differs in several points from a regular LFO (e.g. A-145, A-

146 or A-147), as the slopes are exponential - in contrast to

linear slopes of a normal LFO. In addition the frequency is

defined by both controls, as the attack control defines the

duration of the rising slope, while the decay control defines

the duration of the falling slope.

Each unit has available a comparator that compares the AD

output voltage against a manually adjustable threshold and

turns on the corresponding comparator output as soon as

the AD output voltage goes below the threshold level during

the decay phase. The comparator outputs are normalled to

the trigger inputs of the following stage via the switching

contacts of the trigger input sockets. Consequently the first

unit triggers the second, the second triggers the third and so

on (and the last unit triggers the first one).

Each AD/LFO unit also offers a polarizer control. This allows

adding or subtracting all AD/LFO signals to the mix output

with adjustable level. Additionally each unit features a single

envelope output and a digital “End Of Attack (EOA)” output,

that indicates the end of the attack phase.

Quad AD/LFO A-143-1 System A-100 DOEPFERDOEPFERDOEPFERDOEPFER

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.

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

DOEPFERDOEPFERDOEPFERDOEPFER System A-100 Quad AD/LFO A-143-1

Provided that the trigger inputs are not patched the four

units are daisy chained via the comparator outputs (Cp Out)

as they are normalled via the switching contacts of the

trigger input sockets, i.e. each unit is triggered by the Cp

output of the preceding unit. Fig. 4 shows both the

behaviour of the module in the default state (complex/multi-

state LFO) and with a trigger signal applied to trigger input 1

(complex envelope generator).

The rising edge of triggers the unit 2, the rising edge ofCp1

Cp2 triggers the unit 3 and so on. The example uses

different Attack, Decay and Threshold settings for each unit.

At the bottom of the picture two possible mixes are shown:

For the first mix all envelope signals are added up with the

same level and polarity (+1), i.e. all polarizer controls are in

the fully clockwise position. For the second mix the

level/polarity is +1 for the units 1 and 4, and –1 for the units

2 and 3, i.e. the polarizer controls of unit 1 and 4 are fully

clockwise and the polarizer controls of unit 2 and 3 are fully

counter-clockwise.

The dashed lines at the right end of the mix graphs are valid

if the module is in the cyclic mode, i.e. if the comparator

output 4 is normalled to the trigger input 1 (i.e. default

without external trigger signal). The permanent lines are

valid if an external trigger signal is used to trigger unit 1 (i.e.

the daisy chain is interrupted at trigger input 1).

Fig. 4: Complex envelope generator / LFO

Product specificaties

Merk:	Doepfer
Categorie:	Niet gecategoriseerd
Model:	A-143-1

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