Abstract: A system for computing and displaying quantity and cost of a liquid flowing through a pipe, as gasoline delivered to a consumer. A detector responsive to the passing of a predetermined quantity of the liquid provides a pulse function to money and quantity set circuits. The money and quantity set circuits simultaneously provide signals representative of the units (i.e., gallons) and cost (i.e., dollars) each time a pulse function is received. The signals are accumulated in a memory and the totals are added to subsequently received signals to update the memory each time the predetermined quantity has passed. A nonvolatile totals memory provides a running total of cost and quantity and a sequentially operated display provides a visual display of cost, quantity and totals.

Abstract: An analog rate changer which has a pair of fall-through registers that are controlled to develop analog output signals which bear substantially the same wave shape and amplitude information borne by the analog input signals, but which have a selected greater or lesser frequency spectrum than that of the analog input signals. In a time contraction mode in which the frequency spectrum is reduced, digital signals corresponding to the analog input signals are alternately clocked into the two fall-through registers at a write rate and continuously clocked out of both registers at a read rate which is less than the write rate. In a time expansion mode in which the frequency spectrum is increased, the digital signals are continuously clocked into both registers at a write rate and alternately clocked out of the registers at a read rate which is greater than the write rate.