The system by the UK company Hawk-Eye has had very successful trials and is the front runner out of the systems in development. Hawke-Eye has already been used to make calls in tennis and in cricket. The Football version has been extensively trailed and has performed very well in the test environment. The Hawke Eye system uses three cameras focused on each goal-line, and each taking footage at 600 frames a second. Hawk-Eye is able to give a definitive decision on whether the ball has fully crossed the line, and relay this information in the form of an audible beep to the central referee within half a second. As the Premier League referees use headsets, the signal is easily sent to them. In other leagues, other methods such as through a watch can be used.
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