Signal Equalizer for Balanced Transfer Line-Based Video Switching

A signal equalizer for equalizing a signal transmitted along a balanced transmission line cable, the equalizer comprising:

• a first variable resistor for receiving the signal and dividing a voltage of the signal;
• a cable filter for receiving the signal from the variable resistor and applying a reciprocal transfer function to the signal;
• an amplifier having an inverted input for receiving the inverted signal from the cable filter and a non-inverted input for receiving a signal ground, the amplifier having a shunt between the inverted input and the non-inverted input;
• and
• a dynamic stabilizer coupled to the amplifier, the dynamic stabilizer controlled by a second variable resistor.

A balanced transmission line based signal switching system comprising:

• a signal switch coupled to at least one balanced transmission line video receiver;
• a plurality of first signal transmitters each coupled to the signal switch by a respective 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;
• at least one equalizer coupled between a respective one of the at least one second signal transmitter and the signal switch, and having a variable resistor for dividing a voltage of a signal received from a respective one of the at least one second signal transmitter and a cable filter for applying a reciprocal transfer function to the signal received from the respective one of the at least one second signal transmitter, the variable resistor and the cable filter capable of providing negative equalization to the signal such that loss is added to the signal;
• a display coupled to the video receiver.