Doepfer A-100(~ 40 MB) - Manual (Page 192)

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.