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ANALOG-TO-DIGITAL MEASURING APPARATUS

  • US 3,684,875 A
  • Filed: 09/28/1970
  • Issued: 08/15/1972
  • Est. Priority Date: 09/28/1970
  • Status: Expired due to Term
First Claim
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1. In analog-to-digital measuring apparatus for measuring the value of each of a series of electrical signals having clock means generating a series of uniformly spaced timing pulses, first counter means connected to said clock means for Periodically counting the timing pulses from zero to a predetermined count, the first counter means being operable to generate a first pulse at the commencement of each of its count cycles, and integration means responsive to the first pulse in each cycle to integrate with respect to time the magnitude of an electrical signal applied thereto, said integration means being operative to generate a second pulse a predetermined time interval after the generation of the first pulse where-in the time interval is proportional to the magnitude of each electrical signal to be measured, the combination therewith of first storage means selectively operative in response to receiving the second pulse in each cycle from the integrator means to read in and store the count on said first counter means at the instant the second pulse is generated;

  • comparator means connected to the first counter means and said first storage means for comparing the count on the first counter means with the count stored in said first storage means, said comparator means being operative to generate a third pulse whenever the count on the first counter means equals the count stored in said first storage means;

    second counter means being reset to zero in response to the generation of a first pulse and for counting only in response to a third pulse the additional counts in a next cycle of the integrated value of an electrical signal in excess of the value of a preceding signal measured by said integration means, and second storage means responsive to the second pulse in each cycle for reading in and storing the count on said second counter means at the instant the second pulse is generated.

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