| 摘要 |
<p>The unit has a housing containing means of audio-visual film projection, or slide projection. Electronic circuits provide rapidly synchronised and complementary information which can be preselected digitally on an electronic keyboard. A synchronised and complementary audible commentary is also provided with the information displayed on the screen. Besides its manual function, an electronic control device controls the display of films during times sets by a clock mechanism. The unit has a three mirror system which is used to enlarge the images projected onto the screen. The unit provides, complementary, synchronised information by means of round films, it is luminous and operates automatically by digital means.</p> |
