Analog to digital and digital to analog signal converters

Claim 1

AN ELECTRONIC ANALOG TO DIGITAL CONVERTER FOR CONVERTING ANALOG SIGNALS TO DIGITAL SIGNALS HAVING A DIGITAL VALUE REPRESENTATIVE OF INPUT ANALOG SIGNALS COMPRISING FIRST DIFFERENTIAL RESOLVING MEANS FOR ADDING SIGNALS OF AN ANALOG ANGULAR INPUT AND A DIGITAL ANGULAR INPUT AT A FIRST SPEED TO GENERATE AN OUTPUT SIGNAL REPRESENTATIVE OF THE DIFFERENCE BETWEEN SAID ANGULAR INPUT SIGNALS AT SAID FIRST SPEED, SECOND DIFFERENTIAL RESOLVING MEANS FOR ADDING SIGNALS OF AN ANALOG ANGULAR INPUT AND A DIGITAL ANGULAR INPUT AT A SECOND SPEED TO GENERATE AN OUTPUT SIGNAL REPRESENTATIVE OF THE DIFFERENCE BETWEEN SAID ANGULAR INPUT SIGNAL AT SAID SECOND SPEED, A TRANSFER NETWORK FOR SUMMING SAID OUTPUT SIGNALS AND WHICH IS OPERATIVELY ASSOCIATED WITH FURTHER SIGNAL PROCESSING MEANS INCLUDING A VOLTAGE TO FREQUENCY CONVERTER TO PROVIDE A VARIABLE FREQUENCY OUTPUT SIGNAL THAT CAUSES REVERSIBLE COUNTER MEANS TO COUNT UP OR DOWN AT VARIABLE RATES TO PROVIDE A PULSED WAVE-FORM DIGITAL OUTPUT SIGNAL, ADDING MEANS COUPLED TO THE OUTPUT FROM SAID REVERSIBLE COUNTING MEANS FOR ADDING TOGETHER THE OUTPUTS FROM SELECTED COUNTER STAGES THEREOF, MEANS FOR COUPLING THE OUTPUT FROM SAID ADDING MEANS BACK TO THE INPUT OF SAID FIRST DIFFERENTIAL RESOLVING MEANS, AND MEANS FOR COUPLING THE OUTPUTS FROM ALL COUNTER STAGES BACK TO THE INPUT OF SAID SECOND DIFFERENTIAL RESOLVING MEANS.