| 摘要 |
<p>PURPOSE:To decide a command position coordinate with simple constitution and high accuracy by receiving a sound from three sounding bodies arranged to a remote support rod in a prescribed way by 3 reception means and calculating the coordinate on a video display device corresponding to the combination of sound wave propagation times. CONSTITUTION:A switch 6 of a remote indication rod 1 is controlled by a microprocessor unit 19 and an impulse signal from an impulse oscillator 7 is supplied to a sounding body 2 or the like in 3 sounding bodies 2-4 not arranged in aline, the sounding body 2 is sounded and the sound wave is received by reception elements 8-10 not arranged in a line. Then the sound wave propagation time is calculated by clock devices 15-17. This is similar to the sounding bodies 3,4 and the unit 19 calculates the coordinate on a video display device 11 from the combination of 9 calculation times by the devices 15-17. Through the constitution above, the display coordinate indicated remotely is decided with high accuracy.</p> |
