Extremal-centering method and system

Claim 1

IN A SYSTEM HAVING A FIRST PARAMETER CONTROLLABLE AS A FUNCTION OF A SECOND PARAMETER, SAID FIRST PARAMETER HAVING AN OPTIMUM POINT AT AN EXTERRNAL VALUE OF SAID FUNCTION, THE COMBINATION COMPRISING, (A) MEANS FOR PROVIDING A DERIVED SIGNAL CORRESPONDING TO SAID FIRST PARAMETER ON A FIRST CONDUCTOR, (B) A RESETTABLE STORAGE DEVICE FOR STORING A SAMPLE OF SAID DERIVED SIGNAL, (C) A COMPARATOR MEANS FOR PERIODICALLY COMPARING THE INSTANTANEOUS VALUE OF SAID DERIVED SIGNAL WITH SAID STORED SAMPLE, SAID COMPARATOR MEANS HAVING (1) ONE INPUT CONNECTED TO SAID STORAGE DEVICE AND ANOTHER INPUT CONNECTED TO SAID FIRST CONDUCTOR (2) AND FURTHER HAVING AN OUTPUT CONNECTED TO AN INPUT TERMINAL OF AN AND GATE (D) CLOCK MEANS CONNECTED TO THE OTHER INPUT OF SAID AND GATE AND CONNECTED THROUGH DELAY MEANS TO SAID RESETTABLE STORAGE MEANS, (E) A BISTABLE ELEMENT HAVING ITS INPUT CONNECTED TO THE OUTPUT OF SAID GATE, (F) AN INTEGRATOR HAVING ITS INPUT CONNECTED TO THE OUTPUT OF SAID BISTABLE ELEMENT (G) AND CONTROL MEANS FOR SAID SYSTEM FOR CONTROLLING SAID SECOND PARAMETER PROPORTIONALLY TO THE INTEGRATED OUTPUT OF SAID INTEGRATOR.