Apparatus for measuring amplitude and frequency of modulated signals

Claim 1

A DEVICE FOR TESTING MODULATED SIGNALS COMPRISING TWO BRANCH CIRCUITS CONNECTED IN PARALLEL RELATION AND ADAPTED TO RECEIVE MODULATED INPUT SIGNAL FOR TESTING, A CAPACITOR CONNECTED IN SERIES WITH ONE OF SAID BRANCHES TO PRODUCE UNEQUAL AMPLITUDE VALUES OF THE SIGNALS GENERATED IN SAID BRANCHES FROM SAID INPUT SIGNAL, A GROUNDED VARIABLE CAPACITOR CONNECTED IN PARALLEL WITH EACH OF SAID BRANCHES TO MODIFY THE AMPLITUDE OF SAID TEST SIGNAL IN SAID SECOND BRANCH AS A FUNCTION OF FREQUENCY OF SAID INPUT SIGNAL, A THIRD BRANCH HAVING A TAP CONNECTION WITH SAID SECOND BRANCH AND IN PARALLEL CIRCUIT RELATION WITH SAID GROUNDED CAPACITOR, A HIGH PASS FILTER IN SERIES CONNECTION WITH SAID SECOND BRANCH, A LOW PASS FILTER IN SERIES CONNECTION WITH SAID THIRD BRANCH WHEREBY THE CARRIER AND MODULATION SIGNALS ARE SEPARATED AND PASS INDIVIDUALLY THROUGH SAID SECOND AND THIRD BRANCHES RESPECTIVELY, MEANS IN EACH OF SAID THREE BRANCHES FOR CONVERTING THE SIGNAL THEREIN TO A SUBSTANTIALLY CONTINUOUS D.C. AMPLITUDE, CALIBRATING MEANS IN EACH OF SAID CIRCUITS FOR ESTABLISHING A STANDARD AMPLITUDE CORRESPONDING TO AN ASSIGNED