公开(公告)号：US3597855A

公开(公告)日：1971-08-10

申请号：US3597855D

申请日：1968-09-06

Applicant: TESLA NP

Inventor： STEJSKAL BRETISLAV ,  STEPAN VLADIMIR ,  VLACH PETR

IPC: G09B5/06 ,  G09B7/08 ,  G09B7/04

CPC classification number: G09B5/065 ,  G09B7/08

Abstract: A universal adaptive audiovisual teaching device having visual display means, sound reproducing means and input means for a response by the user. A decision system is provided having a basic decision unit, a stepping unit and timing unit. The decision unit includes a control memory, a peripheral memory and a selector. The decision unit receives information from the visual, sound and response input units, evaluates and compares the response to the audio-visual units and directs movement of the audio-visual units to appropriate activating positions.

公开(公告)号：US3603495A

公开(公告)日：1971-09-07

申请号：US3603495D

申请日：1969-01-09

Applicant: TESLA NP

Inventor： STEJSKAL BRETISLAV ,  STEPAN VLADIMIR ,  VLACH PETR

IPC: G03B17/30 ,  G11B15/20

CPC classification number: G03B17/305

Abstract: The invention relates to a film-feeding device for advancing a perforated or unperforated film strip of any width by any number of frames in either direction. The feeding of the film strip is effected by means of friction drive powered by two reversing motors. The advancement and braking of the film strip is carried out by variously supplying power to the two reversing motors. The displacement as well as the required positioning of the film strip are determined by sensing synchronizing indicia on the film strip by photoelectric sensors. The two reversing motors are switched from a rest condition to working and braking conditions by a special motor control device which is actuated either by starting signals from a primary source effecting the forward or reverse movement of the film strip or by stopping signals set up by the photoelectric sensors sensing the synchronizing marks.