Read out circuit comprising cross-coupled schmitt trigger circuits

Claim 1

A ZERO CROSSING DETECTOR CIRCUIT COMPRISING A PAIR OFF SCHMITT TRIGGER CIRCUITS NORMALLY OPRATIVE IN SYNCHRONIZATION AND IN OPPOSITE STATES WITH RESPECT TO EACH OTHER AND EACH HAVING INPIT AND OUTPUT CIRCUITS, SAID SCHMITT TRIGGER CIRCUITS BEING OPERATIVE IN A FIRST OR SECOND STATE DEPENDENT UPON THE POLARITY OF A SIGNAL APPLIED TO THEIR INPUT CIRCUITS, MEANS FOR BIASING SAID SCHMITT TRIGGER CIRCUITS AT A POINT OF REFERENCE POTENTIAL, MEANS FOR APPLYING A SINE WAVE INFORMATION SIGNAL TO THE INPUT CIRCUITS TO TRIGGER AND SET ONE OF SAID SCHMITT TRIGGER CIRCUITS FROM A FIRST STATE OF OPERATION TO A SECOND STATE WHEN SAID INFORMATION SIGNAL IS POSITIVE WITH RESPECT TO SAID POINT OF REFFERENCE POTENTIAL, MEANS FOR APPLYING A FEED BACK REST SIGNAL FROM THE OUTPUT CIRCUIT OF THE OTHER OF SAID SCHMITT TRIGGER CIRCUITS TO THE INPUT CIRCUIT OF SAID ONE OF SAID SCHMITT TRIGGER CIRCUIT TO AID IN RESETTING SAID ONE SCHMITT TRIGGER CIRCUIT WHEN SAID SINE WAVE INFORMATION SIGNAL IS NEGATIVE WITH RESPECT TO SAID POINT OF REFERENCE POTENTIAL, AND SAID RESET SIGNAL ALSO BEING NEGATIVE WITH RESPECT TO SAID POINT OF REFERENCE POTENTIAL.