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Doepfer A-189-1 Voltage Controlled Bit Modifier Module

Doepfer A-189-1 Voltage Controlled Bit Modifier Module

$ 100.00


Gently used and in perfect working order! 

Module A-189-1 is a voltage controlled bit modifier. It offers several voltage controlled algorithmic functions like voltage controlled bit crunching, bit shifting (with/without carry over), bit exchange, rectifying, absolute value and calculating operations like addition, subtraction, multiplication or division.

The module has two control units both with manual control and CV input with attenuator:

  • one for the algorithmic function according to the selected mode (e.g. number of shifted bits): BC and BC CV

  • and one for the sampling rate (SR and SR CV).

The signal input is equipped with an attenuator. As the module is DC coupled even control voltages can be processed.

The mode (e.g. bit crunching, bit shifting, bit exchange) is selected by a 16-position rotary switch:

Switch position Function Remark
1 bit crushing BC controls the number of bits (bit reduction)
2 AND Signal AND BC 
3 OR Signal OR BC
4 XOR Signal XOR BC
5 bit shift right BC controls the number of bit shifts
6 bit shift left BC controls the number of bit shifts
7 multiplication Signal x BC
8 compare & complement if signal > BC then output = bit complement of the input signal, otherwise unchanged
9 compare & absolute if signal > BC then output = absolute value of the input signal, otherwise unchanged
10 addition output = signal + BC (with overflow/clipping)
11 addition with BC swap same as 10 but with nibble swap of BC (nibble = half byte, i.e. four bits)
12 short delay 1 with dynamic normalization BC controls the length of the delay memory
13 short delay 2 same as 12 but different length/feedback
14 short delay 3 same as 12 but different length/feedback
15 short delay 4 same as 12 but different length/feedback
16 four stages FIR filter BC  controls the filter coefficient