"LG Electronics and Samsung have both figured out how to send video to a moving target, like a headrest TV or a mobile phone. One key trick is overcoming a problem called dynamic multipath, the ever-changing ricochet of radio waves as they bounce off buildings and moving vehicles. This can cause the same television signal to hit an antenna dozens of times—which confounds the TV tuner and leads to a frozen or black screen. The new mobile broadcasts embed within the transmission extra code that the tuner uses to determine how the signal got jumbled and then re-create the original data. It works: Video played flawlessly during our road tests in traffic-choked downtown Las Vegas and on a nearby highway."
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