Patent ID: 7053798

Claim:
Device for controlling a computer system by a group of users, said computer system comprising a graphical user interface and a communication port, and said device having an interface electronic box to be connected to said port and several pointing devices without wired connection with said interface electronic box and, each one of said pointing devices being handled by each one of said users to visually control the continuous movement and the appearance of at least an object displayed by said graphical user interface, and each one of said pointing devices comprising transmitting means to transmit on a communication channel sequences of binary data representative of displacements and states of said pointing devices to said interface electronic box, characterized in that said channel has a plurality of secondary communication channels formed by a common infrared carrier and a set of subcarriers modulated in amplitude at a standard modulation rate by the binary digits of said sequences, said subcarriers having different frequencies for each one of said pointing devices, without common harmonic, and being distributed between a lower frequency and a higher frequency, with intervals at least equal to the double of the value of the said standard modulation rate increased by a guard band.