Electronic balancing apparatus

Claim 1

IN BALANCING APPARATUS ADAPTED TO BE CONNECTED TO BE A PAIR OF ELECTROMECHANICAL TRANSDUCERS FOR TWO PLANE BALANCING OF A ROTATING MEMBER, A REFERENCE GENERATOR CONNECTABLE TO AT LEAST ONE OF SAID TRANSDUCER TO BE ENERGIZED THEREBY TO PRODUCE A REFERENCE SIGNAL OF FIXED AMPLITUDE AND ADJUSTABLE PHASE, FILTER MEANS CONNECTED TO THE OUTPUT OF SAID REFERENCE GENERATOR FOR ELIMINATING ALL SIGNALS OTHER THAN THOSE DUE TO A SINGLE ROTATING MEMBER WHILE PRODUCING AN OUTPUT SIGNAL WHICH IS LOCKED IN PHASE TO THE INPUT SIGNAL APPLIED THERETO REGARDLESS OF THE FREQUENCY OF THE INPUT SIGNAL, A PAIR OF COMPENSATORS CAPABLE OF ADJUSTING THE PHASE AND AMPLITUDE OF A SIGNAL FED THERETO, A PAIR OF MIXERS FOR MIXING THE OUTPUTS OF SAID TRANSDUCERS AND THE OUTPUT OF SAID COMPENSATORS, MEANS FOR CONNECTING SAID FILTER MEANS TO THE COMPENSATORS, AND MEANS FOR CONNECTING ONE COMPENSATOR THE OTHER TRANSDUCER TO ONE OF THE MIXERS WHILE CONNECTING THE OTHER OF THE COMPENSATORS AND THE OTHER TRANSDUCER TO THE OTHER MIXER TO PRODUCE OUTPUT SIGNALS FROM THE MIXERS WHICH SIMULATE THOSE OBTAINED FROM A BALANCED MEMBER.