Computing apparatus
OwnerGianfranco Corsi, George Michael Watsoninventors
Life of this patent
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Abstract
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 value N.sub.1 when signal V.sub.1 is applied to the pulse generator, means for resetting the counter, and means for extracting the count in the counter after a time equal to time T has elapsed during a counting operation with signal V.sub.2 applied to the pulse generator.
Claims9
Computing apparatus for providing a digital output proportional to the ratio of the magnitudes of two analogue input signals multiplied by a predetermined digital factor, comprising a pulse generator for receiving in turn each of the analogue input signals and for generating pulses at a frequency proportional to the magnitude of the input signal, a counter connected to the pulse generator for counting pulses generated thereby, timing means for measuring the time elapsed from the beginning of a counting operation of the counter, store means for storing the value of the elapsed time measured by the timing means when, during a first counting operation with one of the analogue signals supplied to the pulse generator, the count in the counter reaches a value equal to the predetermined digital factor, means for re-setting the counter, and means for providing an output equal to the count in the counter when, during the subsequent supply of the other analogue signal to the pulse generator, the time elapsed from the beginning of a further counting operation is equal to the value held in the store means.
Dependencies are inferred from the claim text.