Patent ID: 7844183

Claim:
A system for transmission of information between at least two players in a training area, said system comprising: an encoder arranged on a first of said players and configured to encode light pulses, a transmitter arranged on said first player and configured to transmit information in form of the coded light pulses towards at least a second of said players, a receiver arranged on said second player and configured to receive said light pulses, a decoder arranged on the second player and configured to decode the information in the coded light pulses, a clock arranged on each of said players, and a synchronizing unit configured to periodically synchronize said clocks, wherein the encoder encodes the light pulses by controlling the transmitter to transmit light pulses at transmission times with a relation to predetermined reference times based on the clock at the first player, wherein the first player and the second player know the predetermined reference times, and wherein the decoder is configured to decode said light pulses by using information about a time of receipt of said light pulses and said predetermined reference times based on the clock provided at the second player.