| 摘要 |
<p>Apparatus (2, Fig. 1) for providing a driver of a vehicle (4, Fig. 1) with at least a lap time of the vehicle (4) when the vehicle (4) is travelling a number of laps over a racing track (6, Fig. 1) which apparatus (2) comprises infrared transmitter means (8, Fig. 1) and infrared receiver means (10, Fig. 1), the transmitter means (8) and the receiver means (10) being for positioning one on the vehicle (4) and one at a side of the racing track (6), and the transmitter means (8) comprising an infrared transmitter 18, a pulse generator 20 for feeding pulses to the transmitter 18, shift register means 22 for providing a logic 0 or a logic 1 at an input for the pulse generator 20, at least one digitally controlled analogue switch 24 connected to at least one input of the shift register means 22, and counter means 26 for changing the state of the digitally controlled analogue switch 24 after each reading of the shift register means 22 in order to enable a next reading of the shift register means 22. <IMAGE></p> |
