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Analog signal processor

  • US 4,700,174 A
  • Filed: 05/12/1986
  • Issued: 10/13/1987
  • Est. Priority Date: 05/12/1986
  • Status: Expired due to Term
First Claim
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1. Apparatus for an analog signal processing system comprising:

  • an analog input circuit having means for controllably selecting an incoming process signal or at least one reference voltage as an input voltage;

    means for sampling said input voltage to obtain a sampled value and for producing a digital signal equivalent to said sampled value;

    means for digitally filtering said sampled value to yield an actual filtered value of said process signal and a separate actual filtered value of said reference voltage;

    means, responsive to said actual filtered reference voltage value and to an expected value of said filtered reference voltage, for calculating at least one coefficient appearing in a pre-defined model of said analog input circuitry to determine an error component injected by said analog input circuitry and existing in the filtered value of said reference voltage; and

    means for compensating said actual filtered value of the process signal, in accordance with said model and using said calculated coefficient therein, to yield a calibrated value therefor.

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