| 摘要 |
This invention relates to an improvement in an audio-visual teaching apparatus of the type having an audio signal recorded on a magnetic strip attached to an opaque information card. When the card is transported past a playback system, the audio signal from the magnetic strip is decoded and reproduced in the form of an audible signal. The improvement includes the use of patterned alphanumeric apertures through the information card for storing the visual information thereon. A source of illumination is positioned behind the path of the information card for illuminating the alphanumeric apertures within the information card as the audio information is decoded and reproduced from the magnetic strip. A plurality of filters are interposed between the source of illumination and the viewer for controlling the color of the illumination passing between, whereby the viewer may select the color in which the visual information is to be displayed in order to improve the learning process.
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