Patent ID: 9008168
Filing Date: 2015-04-14
Classification: H04N

Abstract:
1. A balanced transmission line based video signal switching system comprising: a video signal switch coupled to at least one balanced transmission line video receiver; a first signal transmitter coupled to the signal switch by a first balanced transmission line cable with a first length; at least one second signal transmitter coupled to the signal switch by a second balanced transmission line cable with a second length different from the first length; and at least one equalizer coupled between the at least one second signal transmitter and the signal switch, the at least one equalizer comprising: wherein the equalization stage further includes a cable equalization filter configured to shunt a portion of the input signal, received from the first variable resistor, to an input terminal of the output amplifier, and wherein the first variable resistor is a three-terminal potentiometer; and wherein the equalization stage further includes a gain setting resistor arranged in parallel with a series combination of the first variable resistor and a feedback resistor, wherein the feedback resistor is arranged in a feedback path of the output amplifier circuit, and wherein the gain of the equalization stage is based on a ratio of the gain setting resistor and the feedback resistor.