A digital data processor adapted to be responsive to an applied signal input (x.sub.n) for generating an output signal indicative of a preselected function of the signal input, and comprising signal sampling memory means adapted to be responsive to an alternate one of the applied input signal and a clocked counter output as a read/write-address for generating a statistical amplitude density function d(x) representing the number of occurrences of an amplitude of a sampled input x. Digital attenua…

The computing module comprises a group of three circuits each intended to perform an elementary operation on the input signals and consisting of a summing circuit for receiving the signals E.sub.1 and E.sub.2 and delivering the sum signal S.sub.1 = E.sub.1 + E.sub.2, a subtracter for receiving the signals E.sub.1 and E.sub.2 and delivering the difference signal S.sub.2 = E.sub.1 – E.sub.2 and a multiplier for receiving the signals E.sub.1 and E.sub.3 and delivering the product signal S.sub.3 = E…

Computing apparatus for producing a digital output equal to ##EQU1## where N.sub.1 is a preset digital factor and V.sub.1 and V.sub.2 are analogue input signals. The apparatus includes a pulse generator arranged to receive in turn each of the signals V.sub.1 and V.sub.2 and to generate pulses at a frequency proportional to the magnitude of the signal, a counter for counting pulses received from the generator, timing means for measuring the time T taken for the count in the counter to reach the v…

A computing device for a multiple product gasoline dispensing system having a cost counter for accumulating the cost of gasoline dispensed, a bank of three price decade switches for each gasoline product settable for establishing the amounts of the three places respectively of a three place unit volume price, and a pulse generator for generating a pulse for each one-hundredth of a unit volume of gasoline dispensed. A sequencing circuit is operated by each pulse to sequentially set a binary prede…

Embodiments of a computing system are disclosed which have particular utility in computing the cost of fuel, such as gasoline, as a function of the fuel volume dispensed. Specifically, the computer is designed to be free-running in that its cyclic generation of pulses representative of the established unit volume price of the fuel is independent of the volume of fuel which is actually dispensed or the rate of dispensing. A pulser is used which generates a pulse for each incremental volume of fue…

A computing mechanism which may be used with a weighing device for computing the total value of goods being weighed. The weighing device, which is of generally conventional design, includes a rotatable pointer movable over a suitable semicircular weight scale having uniformly spaced weight graduations. The computing mechanism includes a radially movable price scale with uniformly spaced price graduations. The price scale is of a fixed overall length but has an adjustable radius of curvature abou…

A mechanical digital computing apparatus has three banks of bistable devices, each device being movable between “0” and “1” positions manually and by the passage thereby of balls on a guide track. A number set up on one of the stores of bistable devices is operated on by a number set up on another store by the passage of balls along the guide track in a manner selected by function selection devices which influence the directions taken by the balls. The result appears on the third bank of bistabl…

A computing device for a multiple product gasoline dispensing system having a cost counter for accumulating the cost of gasoline dispensed, a bank of three price decade switches for each gasoline product settable for establishing the amounts of the three places respectively of a three place unit volume price, and a pulse generator for generating a pulse for each one-hundredth of a unit volume of gasoline dispensed. A sequencing circuit is operated by each pulse to sequentially set a binary prede…

A five product gasoline dispensing system having a cost counter for accumulating the cost of gasoline dispensed, five banks of price switches for the five gasoline products respectively settable for pre-establishing the amount of each place of the unit volume price for the respective product within a three place price range, a selector for selectively conditioning the system for dispensing each of the gasoline products and for activating the corresponding switch bank for establishing the unit vo…

A cost-computing device for a fuel-dispensing system having a rotary pulser disc with a plurality of light apertures arranged in four pulser circles, a plurality of output heads, each having a photoelectric pickup, angularly spaced about the axis of the pulser disc for being operated by the light apertures on the pulser disc, and a rotary selector disc associated with each output head having a plurality of light apertures arranged in four selector circles for selectively activating the pulser ci…