Abstract: We describe a method and apparatus for handling information coded in the form of groups of pulses in sequential time slots forming blocks, each block having the same number of time slots. In this pulse transmission system an analog signal is converted to the above pulse code for transmission, and reconverted to analog form by an integration process. The process and apparatus are also adapted to arithmetic operations. An averaging device, employed in both transmission and arithmetic systems, includes a shift register provided with means for producing a current corresponding to the number of stages of the shift register in a given state.