Patent ID: 7837574

Claim:
A ball sport training system to dynamically determine the position of an object during movement, comprising: a position signal transmitter attached to the object including an active ultrasonic transmitter element and an infrared (IR) transmitter element, each with the same transmitter frequency or wavelength and transmitting without channel separation, controlled by a series controller with a predetermined transmitter time program in order to emit an ordered quantity of position signals; a position signal receiver for the reception of the position signals, that is stationary to said position signal transmitter and that has a wireless connection to said position signal transmitter; a position signal evaluation unit, connected downstream from said position signal receiver, evaluating said position signals from the position signal transmitter for the dynamic determination of the object's position during movement, whereas said position signal evaluation unit includes identifying means to identify the respective position signals of said transmitter time program, that are emitted by the IR and ultrasonic transmitter elements of said position signal transmitter; a synchronization transducer synchronizing the position signal evaluation with the position signal emission by using a wireless synchronization signal transmission line, external to the ultrasonic and IR sensor signal transmissions, between said position signal transmitter and said position signal evaluation unit to transmit synchronization signals to said series controller of said position signal transmitter or to said identifying means of said position signal evaluation unit, whereas said synchronization transducer is assigned to said position signal evaluation unit; and wherein said series controller of said position signal transmitter includes an internal timer that is triggered by a temporary reception of an internal synchronization signal from said synchronization transducer and that internally controls said transmitter time program in case of further non-existing external synchronization signals.