Electronic device enabling transmission of video using unshielded twisted pair wire instead of coaxial cable. Word comes from combination of terms balanced, unbalanced, transforms unbalanced signal into balanced signal. In coax cable, transmitted video signal is unbalanced, susceptible to RFI, i.e. noise. Coax cable incorporates shielding to minimize noise. Video baluns transform video signal: each wire in twisted pair transmits identical signal with opposite polarized magnetic fields, with noise affecting each signal equally, when signals combined, noise is cancelled out. With designed balun, unshielded twisted pair wire can transmit video for much longer distances than coax, at lower cost.
Canon glossary us