| 摘要 |
<p>Apparatus is provided in which a code is carried by a member whose position it is desired to determine and is read by detecting means as the member moves to give an indication of its position at any one time. …<??>The member 1 has a disc 3 attached to move with it. The disc 3 has two tracks on it, a pseudo-random code track 8 and a timing code track 4. Read heads 5, 6, 9 and 10 read the tracks thereby defining the position of the member 1. The signals from the read heads 5, 6, 9 and 10 are processed in a processing circuit PC to give the position of the member 1. The position is displayed at 2 which also provides a control for the member 1.</p> |
