Doepfer A-112 Manual

Doepfer Ikke kategoriseret A-112

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Side 1/24
doepfer System A - 100 Sampler A-112
1
1. Introduction
Module A-112 (SAMPLER) is a combination module,
including a voltage controlled 8 bit Sampler and a
voltage controlled Wavetable Oscillator.
The module has the characteristic “grungy“ sound
of the early 8 bit Samplers and is a welcome addi-
tion to the A-100’s sound generating capabilities.
But it should not be compared with the polyphonic 16
bit MIDI samplers available on the market.
The module contains an A/D converter (ADC) for
recording the audio signal (8 bit resolution), digital
memory for storage of the the sampled signal, a D/A
converter (DAC) for playback and the control unit.
The memory is divided into two banks (S1, S2) with 64
kbyte each. In wavetable mode each bank is arranged
as 256 pages of 256 bytes.
The memory is non-volatile, i.e. after power-off the
sampling data in the memory is maintained.
Gate In
A-112
SAMPLER
Audio IN /
Wave-CV In
CV In
Audio Out
Modus
Man. Trig.
MIDI In
MIDI Out
Atten.
Tune
Run
A-112 Sampler System A - 100 doepfer
2
Sampling mode
In sampling mode the incoming audio signal is sam-
pled with a sampling frequency that is controlled
manually and from the external control voltage
input. The audio signal is converted by the ADC into 8
bit digital data and sequentially written into the me-
mory (memory address 0 ... 65 535). With a sampling
frequency of 32kHz this corresponds to 2 seconds
sampling time.
During playback the sampling data in the memory is
read sequentially (address 0 ... 65535) and converted
into the corresponding audio signal by the DAC. The
sampling frequency in play mode is controlled manu-
ally and from the external control voltage input. Play-
back is stopped if the last memory address (65535) is
reached.
Via MIDI dump the sampling memory can be sent to a
computer for storing the data on hard-disk or any other
storage device. The computer may also transmit
sampling data to the A-112 via MIDI dump.
Wavetable mode
In wavetable mode the memory access is not sequen-
tially but by page. The page number is selected by
an external voltage. This voltage can be may genera-
ted manually (e.g. with the manual control voltage
source A-176) or it may come from any other voltage
source (e.g. LFO, ADSR, Sequencer). Both record and
play take place in a loop whereby the complete page
is always passed through. When reaching the end of a
page the run control determines if a jump to another
page takes place or the loop remains in the same page
- depending upon the voltage controlling the wa-
vetable/page.
Playback with a dynamic control voltage (e.g. ADSR,
LFO, Random, Sequencer, MIDI-to-CV) results in
“sweeping through“ the different pages (Wavetable
principle). If the memory of the A-112 contains sui-
table wavetables in the 256 pages, the result is a
voltage controlled Wavetable Oscillator with two con-
trol voltages: one for the audio frequency (pitch, tune),
one for the wavetable number.
Normally suitable wavetables are generated by a com-
puter and transferred to the A-112 via MIDI-Dump.
Effect mode
Additionally the module offers some effects, like De-
lay, Reverse Delay and Pitch Shifter. Of course, due
to the 8 bit resolution these effects are not to be
compared however with the results from high-end
effect devices, but should be considered as a free
extra gift for strange sounds.

Produkt Specifikationer

Mærke: Doepfer
Kategori: Ikke kategoriseret
Model: A-112

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