| 摘要 |
On the basis of the propagation time of ultrasonic waves, this ultrasonic position detection system calculates a first distance (d1) which is the distance from a first ultrasonic transducer (XA1) of a first device (DA) to a second ultrasonic transducer (XB1) of a second device (DB), and a second distance (d2) which is the distance from the first ultrasonic transducer (XA1) of the first device (DA) to a third ultrasonic transducer (XB2) of the second device (DB). When the difference between the first and second distances (d1, d2) is greater than a third distance (d3) which is the distance between the second and third ultrasonic transducers (XB1, XB2), the ultrasonic position detection system performs computations as if the difference between the first and second distances (d1, d2) were equal to the third distance (d3). |
