Resolver phase shift encoder

Claim 1

A RESOLVER PHASE SHIFT ENCODER COMPRISING A COUNTER, A HIGH FREQUENCY SIGNAL SOURCE, A GATE CONNECTING THE HIGH FREQUENCY SOURCE TO THE COUNTER SO THAT THE COUNTER COUNTS THE NUMBER OF CYCLES OF HIGH FREQUENCY SIGNAL DURING WHICH THE GATE IS OPEN, A ZERO CROSS-OVER DETECTOR SEQUENTIALLY RECEIVING A REFERENCE SIGNAL AND A PHASE DISPLACED SIGNAL FOR DETECTING ZERO LEVEL CROSS-OVER IN A GIVEN DIRECTION AND OPENING THE GATE IN THE INTERVAL BETWEEN ZERO CROSS-OVER OF THE SIGNALS, GENERATING MEANS CONNECTED TO THE HIGH FREQUENCY SOURCE AND PROVIDING A PAIR OF LOW FRQUENCY REFERENCE SIGNALS FREQUENCY RELATED TO THE HIGH FREQUENCY SIGNALS, A PHASE MODULATED RESOLVER ENERGIZED BY THE REFERENCE SIGNALS AND CONNECTED TO THE ZERO CROSSOVER DETECTOR AND RESONSIVE TO A CONDITION FOR PROVIDING A PHASE MODULATED SIGNAL PHASE DISPLACED FROM THE REFERENCE SIGNALS IN ACCORDANCE WITH THE CONDITION TO PROVIDE AN OUTPUT FROM THE COUNTER CORRESPONDING THERETO, AND MEANS FOR CONTROLLING THE RELATIVE AMPLITUDES OF THE REFERENCE SIGNALS INCLUDING A PHASE MODULATED RESOLVER HAVING A FIXED ROTOR AND CONNECTED TO THE GENERATING MEANS AND THE ZERO CROSS-OVER DETECTOR FOR ENERGIZING THE COUNTER IN ACCORDANCE WITH THE RELATIVE AMPLITUDES OF THE REFERENCE SIGNALS, AND MEANS CONTROLLED BY THE COUNTER FOR CHANGING THE RELATIVE AMPLITUDES OF THE SIGNALS, AND MEANS FOR CONTROLLING RELATIVE PHASE SHIFT OF THE REFERENCE SIGNALS INCLUDING MEANS FOR CONNECTING THE GENERATING MEANS TO THE ZERO CROSS-OVER DETECTOR FOR APPLYING THE REFERENCE SIGNALS TO THE ZERO CROSS-OVER DETECTOR AND CONTROLLING THE OUTPUT OF THE COUNTER IN ACCORDANCE WITH THE PHASE SHIFT OF THE SIGNALS, AND PHASE SHIFTING MEANS CONTROLLED BY THE COUNTER FOR CHANGING THE PHASE DISPLACEMENT OF THE SIGNALS.