Resolver incremental encoder

Claim 1

IN AN INCREMENTAL ENCODER SYSTEM COMPRISING A RESOLVER TRANSDUCER INCLUDING A ROTOR HAVING A PAIR OF WINDINGS ARRANGED IN SPACED QUADRATURE, A STATOR HAVING A PAIR OF WINDINGS ARRANGED IN SPACED QUADRATURE, SAID PAIR OF ROTOR AND STATOR WINDINGS BEING VARIABLE INDUCTIVEDLY COUPLED, A SOURCE OF A CONSTANT FREQUENCY ALTERNATING CURRENT FOR ENERGIZING A FIRST PAIR OF SAID WINDINGS SO AS TO INDUCE A SINUSOIDAL CARRIER WAVE IN A SECOND PAIR OF SAID WINDINGS, A SHAFT FOR ANGULARLY POSITIONING THE PAIR OF ROTOR WINDINGS IN RELATION TO THE PAIR OF STATOR WINDINGS AT A VARIABLE ANGULAR VELOCITY SO AD TO VARY THE INDUCTIVE COUPLING BETWEEN SAID ROTOR AND STATOR WINDINGS AND SUPERIMPOSE THE ANGULAR VELOCITY OF THE SHAFT UPON THE ANGULAR VELOCITY OF THE SINUSOIDAL CARRIER WAVE, A LAG-LEAD PHASE SHIFTER NETWORK CONNECTED ACROSS OUTPUT CONDUCTORS OF SIAD SECOND PAIR OF WINDINGS, THE LAG-LEAD PHASE SHIFTER NETWORK INCLUDING FIRST AND SECOND OUTPUT MEANS, FREQUENCY MULTIPLIER MEANS OPERATIVELY CONNECTED TO SAID FIRST AND SECOND OUTPUT MEANS TO PROVIDE A PAIR OF SIGNALS, AND MEANS TO COMBINE SAID SIGNALS SO AS TO EFFECT A COUNT SIGNAL HAVING A FREQUENCY EQUIVALENT TO AN INTEGER MULTIPLE OF THE VELOCITY OF ROTATION OF SAID SHAFT.