Analog to digital converter

Claim 1

ANALOG ELECTRIC SIGNAL DIGITIZING APPARATUS, COMPRISING: MEANS ACTUATED BY THE ANALOG ELECTRIC SIGNAL FOR PRODUCING A TRAIN OF PULSES, EACH PULSE MODULATED TO PRODUCE A CODED CONDITION THEREOF IDENTIFYING IT WITH A CORRESPONDING PORTION OF THE ANALOG SIGNAL; A QUANTIZER FED BY THE MODULATED PULSES AND ACTUATED THEREBY TO PROVIDE COUNTING PULSES THE NUMBER OF WHICH IS DIRECTLY RELATED TO THE CODED CONDITION OF THE ACTUATING PULSES; A COUNTER ELECTRICALLY CONNECTED FOR RECEIVING AND STORING THE COUNTING PULSES SUPPLIED BY THE QUANTIZER; DIGITAL TO ANALOG CONVERSION MEANS FED BY THE COUNTING PULSES FOR PROVIDING AN ANALOG SIGNAL CORRESPONDING TO THE COUNT THEREOF; INTEGRATING MEANS ELECTRICALLY CONNECTED TO BOTH ANALOG SIGNALS FOR FORMING A FEEDBACK SIGNAL REPRESENTATIVE OF THE INTEGRAL OF THE DIFFERENCE OF SAID ANALOG SIGNALS; AND INTERCONNECTION MEANS RELATING THE INTERGRATING MEANS AND PRODUCING MEANS FOR PRESENTING THE FEEDBACK SIGNAL TO SAID PRODUCING MEANS.