Angular displacement phase shift encoder analog to digital converter

Claim 1

A CIRCUIT COMPRISING A SOURCE OF EXCITATION VOLTAGE MEANS CONNECTED TO THE SOURCE AND ENERGIZED BY THE EXCITATION VOLTAGE AND HAVING ONE PART ADAPTED TO BE DISPLACED TO PROVIDE TWO VOLTAGES WHOSE AMPLITUDES VARY IN ACCORDANCE WITH THE SINE AND COSINE OF THE DISPLACEMENT AND WHOSE PHASE IS DISTORTED FROM THE EXCITATION VOLTAGE, A PHASE SHIFTING NETWORK CONNECTED TO THE MEANS AND RESPONSIVE TO THE TWO VOLTAGES AND PROVIDING AN OUTPUT SIGNAL WHOSE PHASE IN DISPLACED FROM THE EXCITATION VOLTAGE BY AN AMOUNT CORRESPONDING TO THE DISPLACEMENT OF THE ONE PART AND THE PHASE DISTORTION, A REFERENCE SIGNAL SELECTOR CONNECTED TO THE MEANS AND RESPONSIVE TO THE TWO VOLTAGES THEREFROM AND PROVIDING AS A REFERENCE SIGNAL A VOLTAGE CORRESPONDING TO THE VOLTAGE OF LARGER MAGNITUDE, AND MEANS CONNECTED TO THE PHASE SHIFTING NETWORK AND THE REFERENCE SIGNAL SELECTOR FOR COMPARING THE RELATIVE PHASE DISPLACEMENT OF THE OUTPUT SIGNAL AND THE REFERENCE SIGNAL FOR PROVIDING AN OUTPUT CORRESPONDING THERETO.