Dynamic magnetic information storage or retrieval – Recorder control of an external device – Slide or movie projectors
Patent
1976-01-07
1978-02-07
Stephan, Steven L.
Dynamic magnetic information storage or retrieval
Recorder control of an external device
Slide or movie projectors
353 15, G03B 3100, G11B 3100
Patent
active
040729893
ABSTRACT:
An audio-visual presentation device including a magnetic cassette tape drive and circuitry adapted in a normal automatic forward mode for reproducing audio signals from one track of the cassette tape and for controlling a remotely controllable slide projector in response to signals from a second track of the cassette tape such that the audio signals and slide projector visual presentation remain in synchronization. The device includes a manual reverse switch to permit the device operator to repeat portions of the audio-visual presentation, the switch when in a first position providing normal automatic forward operation in a first tape drive mode and when in a second position providing in a second tape drive mode reverse operation at a higher speed with the audio output muted and the signals from the second track of the tape controlling the projector to cycle in a reverse direction. Electrical circuitry connected to the manual reverse switch responds to movement of such switch from the second to the first position to provide control for transporting the tape to the visual advance signal immediately preceding the audio signal portion corresponding to the slide being shown by the projector when the switch is changed from the second to the first position whereby the device is returned to normal automatic forward mode prior to the beginning of the audio signal portion corresponding to such slide. The electrical circuitry also prohibits tape drive direction changes when visual advance signals are being detected from the second track of the tape and when the projector is cycling such that synchronization of the audio output and the slide projector display is maintained irrespective of movement of the switch between its first and second positions.
REFERENCES:
patent: 2787669 (1957-04-01), Flan et al.
patent: 2975672 (1961-03-01), Shields
patent: 3257515 (1966-06-01), Nakamatsu
patent: 3276315 (1966-10-01), Chalfin
patent: 3447864 (1969-06-01), Shadley
patent: 3756715 (1973-09-01), Naf
patent: 3772473 (1973-11-01), Parham
Alexander Cruzan
Marben Robert L.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Stephan Steven L.
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