Voltage-controlled nondispersive variable delay system utilizing modulation to pass signal and frequencyinverted signal through identical dispersive delay lines

Claim 1

A DELAY SYSTEM FOR CONTROLLING THE MAGNITUDE OF DISPERSIONLESS DELAY INTRODUCED TO A CARRIER MODULATED INPUT SIGNAL COMPRISING FIRST AND SECOND SUBSTANTIALLY IDENTICAL DELAY MEDIA EACH HAVING A DELAY CHARACTERISTIC THAT VARIES WITH FREQUENCY, MEANS FOR VARIABLY MODIFYING SAID CARRIER FREQUENCY OF SAID INPUT SIGNALS AND FOR APPLYING SAID MODIFIED SIGNAL TO SAID FIRST DELAY MEDIUM TO DISPERSIVELY DELAY SAID INPUT SIGNAL, AND MEANS FOR CANCELING SAID DISPERSION AND DOUBLING SAID DELAY INCLUDING MEANS FOR INVERTING ABOUT SAID CARRIER FREQUENCY THE SIGNAL COMPONENTS IN THE OUTPUT OF SAID FIRST DELAY MEDIUM AND FOR APPLYING THE INVERTED SIGNAL COMPONENTS TO SAID SECOND DELAY MEDIUM.