Editing Ground loop (electricity) (section)

====Balanced lines====
A more comprehensive solution is to use equipment that employs [[differential signaling]].  Ground noise can only get into the signal path in [[single-ended signaling]], in which the ground or shield conductor serves as one side of the signal path.  When the signal is sent as a differential signal along a pair of wires, neither of which are connected to ground, any noise from the ground system induced in the signal lines is a [[common-mode signal]], identical in both wires.  Since the line receiver at the destination end only responds to differential signals, a difference in voltage between the two lines, the common-mode noise is canceled out.  Thus these systems are very immune to electrical noise, including ground noise.  Professional and scientific equipment often uses differential signaling with [[balanced line]]s.