Means for improving the quality of received television images

Claim 1

IN APPARATUS FOR RECEIVING AND PROCESSING AN INCOMING VOLTAGE WAVE CHARACTERIZED BY A NOMINALLY ABRUPT LEVEL TRANSITION THAT HAS BEEN DEGRADED IN DEVELOPMENT OR TRANSMISSION, SAID DEGRADATION APPEARING AS A TRANSITION OF EXCESSIVE RISE TIME, AN ELONGATED ELECTROMAGNETIC WAVE PROPAGATION DEVICE HAVING NEAR END TERMINALS AND FAR END TERMINALS AND COMPRISING SERIES INDUCTANCE AND SHUNT CAPACITANCE DISTRIBUTED THROUGHOUT ITS LENGTH, SAID DEVICE BEING PROPORTIONED TO PROVIDE A ROUND-TRIP WAVE DELAY, FROM THE NEAR END TO THE FAR END AND RETURN, OF ONE HALF SAID RISE TIME, A RESISTOR, OF MAGNITUDE TO MATCH THE CHARACTERISTIC IMPEDANCE OF SAID DEVICE, CONNECTED TO THE NEAR END TERMINALS, THE FAR END TERMINALS BEING OPEN-CIRCUITED, A LOW-IMPEDANCE COIL, OF LENGTH SHORT COMPARED WITH THE LENGTH OF SAID PROPAGATION DEVICE, JUXTAPOSED WITH THE NEAR END SERIES INDUCTANCE OF SAID DEVICE AND INDUCTIVELY COUPLED THERETO, A HIGH IMPEDANCE LOAD CONNECTED TO SAID COIL, MEANS FOR CONVERTING SAID INCOMING VOLTAGE WAVE INTO A WAVE OF CURRENT, MEANS FOR LAUNCHING SAID CURRENT WAVE INTO THE NEAR END TERMINALS OF SAID DEVICE, MEANS FOR INVERTING THE POLARITY OF THE VOLTAGE DEVELOPED ACROSS SAID LOAD, AND MEANS FOR COMBINING SAID INVERTED LOAD VOLTAGE WITH SAID INCOMING WAVE.