Audio-visual system including audio-visual slides

Details Audio-visual system including audio-visual slides Audio-visual system including audio-visual slides

1972-05-22

1976-03-09

Grieb, Wm. H.

Optics: image projectors

Plural projection paths with single light source

353 19, G09B 708

Patent

active

039422690

ABSTRACT:
An audio-visual system for providing correlated audio and visual presentations from audio-visual slides in a sequence corresponding to a branched learning format. Upon an operator selecting a presented response choice, a projected program containing first indicia providing a binary number indicating the number of steps and second indicia indicating the direction which the slide magazine should be stepped to be in position for presenting the next slide, is sensed and the binary number is stored in a register. The magazine is stepped in the indicated direction; and the number of steps taken are counted and compared to the binary number stored in the register. When the compared counts are equal, the stepping of the magazine is stopped.

REFERENCES:
patent: 3122054 (1964-02-01), Dimitracopoulos
patent: 3353280 (1967-11-01), Emde
patent: 3383781 (1968-05-01), Diuzet
patent: 3471942 (1969-10-01), Weitzman
patent: 3497966 (1970-03-01), Gaven
patent: 3501851 (1970-03-01), Price
patent: 3541699 (1970-11-01), Baker
patent: 3608208 (1971-09-01), Willardson

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