| 摘要 |
<p>The electronic system permits the automatic projection of slides from several projectors by means of electrical signals recorded on a magnetic tape. The system has as many frequency modulated low frequency carriers as there are projectors. These carriers are designed to produce all lighting effects and slide changing on each projector independent of the others. The frequency modulated carriers, controlling the projectors, are mixed so as to be recorded on a single track of a magnetic tape of a tape recorder, whilst at the same time acting directly on the projector in the "manual, recording" position. A filter separates at the recording position ("reproduction"), the carrier mixed during recording. The switching functions "manual recording", "reproduction" may be carried out automatically.</p> |
