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System A - 100

ADSR A-140

1. Introduction

Module A-140 (ADSR) is an envelope generator,

and, since it puts out control voltages, counts as one

of the modulation devices in a modular system.

As soon as the gate input receives sufficient voltage,

the ADSR generates a variable voltage, changing in

time, called an envelope. This varying voltage is

output in normal (positive) and inverted form, and can

be used, eg., for voltage controlled modulation of a

VCO, VCF, or VCA, or for processing other modules’

inputs and outputs.

The shape of the envelope is governed by four para-

meters: Attack, Decay, Sustain and Release (see Fig.

1 on page 3).

The envelope is started (triggered) by a gate signal

either from the INT.GATE voltage on the system bus,

or, if a signal is put into it, from the gate input socket.

The envelope can also be re-triggered, ie. start from

scratch again, each time a trigger signal is sensed at

the Retrig. input socket, when the gate is still open

(see Fig. 2 on page 5).

Gate

Decay

Inverse

Output

Release

Attack

A-140

ADSR

Sustain

Retrigger

Output

ADSR

Control

Time

Range

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer ADSR A-140 1. Introduction Gate A-140 ADSR Retrigger Attack Output Decay Output Inverse Output ADSR Control Sustain Release Time Range Module A-140 (ADSR) is an envelope generator, and, since it puts out control voltages, counts as one of the modulation devices in a modular system. As soon as the gate input receives sufficient voltage, the ADSR generates a variable voltage, changing in time, called an envelope.
PAGE 2
A-140 ADSR System A - 100 Controls: 2. ADSR overview 1 A: Attack time control ADSR 2 D: Decay time control ENVELOPE GEN. 3 S: Sustain level control 4 R: Release time control A-140 Gate ➊ A 0 ➀ 10 ➋ D 0 ➁ 10 In / Outputs: Output ➌ S 0 ➂ 10 Output ➍ R 0 Inverse Output H L M ➃ ! Gate: Input for gate voltage " Retrig.: Input for re-trigger voltage § Output: Output: responds to a gate signal by putting out the voltage envelope set by the controls.
PAGE 3
System A - 100 doepfer 1 A 3. Controls The ADSR puts out a varying voltage, called an envelope, whenever a gate signal is sensed (see Fig. 1). Attack Time ADSR A-140 Release Time Decay Time approx. +8 V With this control you set the envelope’s attack time. Whenever the envelope is triggered - via the internal gate, a ‘note on’ command via a MIDI/CV interface, or a gate signal at gate input 1 - a control voltage is output at sockets 3 and 4, rising to maximum in the time set by this control.
PAGE 4
A-140 ADSR System A - 100 5 ADSR Control 4. In / Outputs LED 5 gives a visual indication of the envelope voltage at the output. ! Gate doepfer Socket ! is the ADSR’s gate input. 6 Time Range H The gate input is a switched socket, normalled This 3-position rotary switch lets you select the right time range for your requirements. The three positions are: • H (high): up to minutes • M (medium): standard mid-range • L (low): down to less than 100 µsec to the INT. GATE circuit on the system bus.
PAGE 5
System A - 100 doepfer ADSR A-140 " Retrig. % Inverse Output Socket " is the ADSR’s retrigger input, which can be connected, for instance, to the output from an LFO. That means that while the gate is open, the envelope re-triggers every time it senses a pulse from the LFO (see Fig. 2). The Inverse Output carries exactly the same voltage envelope as the ordinary outputs but inverted - with negative instead of positive voltages (see Fig. 3).
PAGE 6
A-140 ADSR System A - 100 5. User examples The envelope generated by the ADSR can be used for most kinds of modulation: • ADSR - VCA Modulation of loudness / amplification over time. • ADSR - VCA for voltage control of any in / output processes, with the process time controlled by the A, D, S, and R parameters. • ADSR - VCF Modulation of the cut-off frequency produces a constantly evolving sound spectrum. • ADSR - VCO (PWM) Modulation of the pulse width of a VCO produces a constantly changing timbre.
PAGE 7
doepfer System A - 100 ADSR A-140 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system. A-140 ADSR Gate A-140 ADSR Gate A 10 0 Retrig. Retrig. 0 • Draw in patchleads with colored pens.
PAGE 8
A-140 ADSR 8 System A - 100 doepfer