Doepfer - A-189-1: Voltage Controlled Bit Modifier

Manufacturer Description:

module a-189-1 is the first derivative of the universal ad/da module. 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


this module has a maximum current draw of 50ma. it requires 8 hp/te worth of space to fit in a eurorack frame.