Digitally controlled pulse register

Claim 1

Means for so controlling the angular position of a shaft that its position is dependent on the value of a number stored in a digital register equipped with a binary memory, said means comprising: a decoder supplied by said memory, and having a separate output for each of a plurality of successive digits, a matrix comprising a plurality of input lines, one connected to each output of the decoder, and an output line for each input line, each output line being so connected through diode means to at least one input line that all output lines for digits having a value no greater than the number in said register are in one logical state, while those output lines for larger digits are in another logical state, a comparator comprising a plurality of gates, one input of each gate being connected to a different matrix output line, a rotary switch comprising a rotating contact member and a plurality of contact studs, two of which are engaged by said contact member at each operating position thereof, and each of which is connected to the other input of one of said comparator gates, a reversible servomotor connected to drive said rotating contact member, a decoder supplied by said comparator, and a logic circuit supplied by said last mentioned decoder and connected to cause actuation of said servomotor in one direction or the other, or stoppage of said servomotor in dependence on the number of comparator gates having outputs in a logical state differing from that of the majority of said comparator gates.