| 摘要 |
The apparatus contains two fixed ultrasound transmitters, an ultrasound receiver forming part of the movable object, and a calculator. A trigger signal from the calculator releases ultrasonic pulses on the ultrasound transmitters and the calculator determines the coordinates of the ultrasound receiver and hence of the movable object from the times required for the ultrasonic pulses to travel from the ultrasound transmitters to the ultrasound receiver and from the distance between the ultrasound transmitter. The apparatus is suitable in particular for controlling the cursor on a screen by means of a so-called "mouse" and enables precise determination of position and accurate and simple calculation of coordinates and may therefore be used as so-called "digitizer" for geometric data processing.
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