Doepfer A-109 Voltage Controlled Audio Signal Processor Manual de usuario descargar pdf

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System A - 100

VC Signal Processor

A-109

1. Introduction

Module A-109 is a voltage controlled audio signal

processor containing the components VCF, VCA and

PAN (see fig. 1 on page 4).

The module is based on Doug Curtis' CEM3379 that

was used in many Sequential™, Ensoniq™ and

PPG™ synthesizers.

The audio in/outputs of the module are normalized,

e.g. the VCF output is fed into the VCA input privided

that no jack plug is inserted to the VCA audio input

socket.

The VCF is a 24 dB low pass filter with voltage

controlled resonance. The filter has a so-called

"constant amplitude versus resonance design", i.e.

the peak-to-peak output level remains within 6dB when

the output waveform rings from added resonance.

Manual controls for frequency and resonance are

available as well as 2 CV inputs for both (one with

attenuator). The frequency range is about 5 Hz ...

20kHz, resonance ranges from 0dB up to self oscilla-

tion.

The main VCA has a combined exponential/linear

control scale: exponential from about 0...+200mV

(corresponding to about -100dB ... -20dB attenuation),

and linear from about 200mV...+5V (corresponding to

about -20dB...0dB). The "rounded" knee at the scale

bottom allows an envelope to decay to zero with a

natural exponential sound. Manual control for ampli-

tude is available as well as 2 CV inputs (one with

attenuator).

The gains of the panning VCAs are complementary,

beeing equal and half of maximum at about +2.5V CV.

The control scales are linear between about +1 and

+3.5V CV, becoming logarithmic beyond these extre-

mes. Manual control for panning is available as well

as 2 CV inputs (one with attenuator).

1 2 3 4 5 6 7 8 9 10

Indice de contenidos

Pagina 1 - 1. Introduction

doepferSystem A - 100VC Signal Processor A-10911. IntroductionModule A-109 is a voltage controlled audio signalprocessor containing the components

Pagina 2 - 2. Overview

A-109 VC Signal ProcessorSystem A - 100doepfer106. Patch-SheetThe following diagram of the modules can help yourecall your own Patches. They’re des

Pagina 3

A-109 VC Signal ProcessorSystem A - 100doepfer22. OverviewA-109 VC Signal Processor24 dB Low Pass / VCA / Panning➋CV F2010010010010➊0100100100100

Pagina 4

doepferSystem A - 100VC Signal Processor A-1093Controls:1 Level : Attenuator for input signal at socket !(Audio In 1)2 Frq. : Manual control of fi

Pagina 5 - 3. Controls

A-109 VC Signal ProcessorSystem A - 100doepfer4Fig. 1: A-109 structureResonanceAudioOutFrequencyVCFAmplitudeCV 1CV 2man.CV 1CV 2man.Audio In 1Audi

Pagina 6

doepferSystem A - 100VC Signal Processor A-10953. Controls1 LevelUse this attenuator to control the amount of signalentering the filter input "

Pagina 7 - 4. In- / Outputs

A-109 VC Signal ProcessorSystem A - 100doepfer64 Res.With this control you adjust the filter’s resonance (oremphasis or Q factor) - the parameter w

Pagina 8

doepferSystem A - 100VC Signal Processor A-1097The actual panning setting results from the sum of themanual control 8 and the external control input

Pagina 9 - 5. User Examples

A-109 VC Signal ProcessorSystem A - 100doepfer8If you patch a modulation source (eg LFO, ADSR) tothese inputs, the cut-off frequency of the filter

Pagina 10 - VC Signal Processor

doepferSystem A - 100VC Signal Processor A-1099( Pan InThis socket is the audio input of the Panning sec-tion. It is internally connected to the VCA

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Doepfer A-109 Voltage Controlled Audio Signal Processor Manual de usuario

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