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Automatic zero balance circuit

  • US 4,414,852 A
  • Filed: 09/14/1981
  • Issued: 11/15/1983
  • Est. Priority Date: 09/14/1981
  • Status: Expired due to Fees
First Claim
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1. An automatic zero circuit for use with carrier transducers, said automatic zero circuit comprising:

  • a reference generator for generating a phase reference signal and a quadrature reference signal, said transducer being operatively connected to said reference generator and powered by said reference generator;

    a summing circuit operatively connected to said transducer for receiving a return signal from said transducer, for summing said return signal with at least one other signal and for generating an output signal equal to the summation of said return signal and said at least one other signal;

    means operatively connected to said summing circuit for separating said output signal of said summing circuit into at least one component value with respect to said reference generator;

    means operatively connected to said separating means for generating at least one DC signal with a value indicative of said at least one component value;

    means operatively connected to said generating means for converting the value of said at least one DC signal into at least one modulated signal whose frequency is proportional to the value of said DC signal;

    means operatively connected to said converting means for counting said at least one modulated signal; and

    means operatively connected to said counting means and said summing circuit for generating said at least one other signal in response to the count and being proportional to and opposite from said at least one component value, the output signal from said summing circuit being nulled.

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