| 摘要 |
Apparatus for projecting a highlighting spot on a projected image. When an operator uses an actuator for controlling the position of the highlighting spot, position control signals are applied to a servomechanism to position the highlighting spot in two axes. Simultaneously, the apparatus converts the control signals into a second form suitable for recording on a tape or other media in a control track simultaneously with an oral program on an audio track. The recorded control signals are converted back into a form corresponding to signals from the actuator thereby to control slide changes and the highlighting spot position.
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