Fine and coarse signal mixing circuit

Claim 1

IN A CONTROL SYSTEM HAVING A CONTROLLED OBJECT AND A CONTROLLING OBJECT, HIGH SPEED AND LOW SPEED TRANSMITTERS OPERATED FROM SAID CONTROLLING OBJECT, HIGH SPEED AND LOW SPEED RECEIVERS ELECTRICALLY CONNECTED TO SAID HIGH AND LOW SPEED TRANSMITTERS RESPECTIVELY AND MECHANICALLY CONNECTED TO SAID CONTROLLED OBJECT FOR PROVIDING HIGH AND LOW SPEED SIGNALS RESPECTIVELY, A FIRST CIRCUIT RESPONSIVE TO SAID LOW SPEED SIGNAL, AND FIRST CIRCUIT INCLUDING BLOCKING MEANS FOR BLOCKING THE VOLTAGE SUPPLIED THERETO BELOW A PREDETERMINED VALUE, AND A SECOND CIRCUIT RESPONSIVE TO SAID HIGH SPEED SIGNAL, SAID FIRST CIRCUIT FORMING A FEEDBACK LOOP OF SAID SECOND CIRCUIT WHEN SAID LOW SPEED SIGNAL IS ABOVE SAID PREDETERMINED VALUE WHEREBY FOR LOW SPEED SIGNALS BELOW SAID PREDETERMINED VALUE SAID BLOCKING MEANS IS EFFECTIVELY AN OPEN CIRCUIT AND FOR LOW SPEED SIGNALS ABOVE SAID PREDETERMINED VALUE SAID BLOCKING CIRCUIT IS EFFECTIVELY CLOSED, IN THE LATTER CASE SAID HIGH SPEED SIGNAL IS EFFECTIVELY ATTENUATED DUE TO THE HIGH GAIN OF SAID LOW SPEED SIGNAL IN THE FEEDBACK PATH OF THE HIGH SPEED SIGNAL CIRCUIT AND THUS THE TRANSITION FROM ONE SPEED SIGNAL TO ANOTHER IS ACCOMPLISHED SMOOTHLY.