Dynamic magnetic information storage or retrieval – Recorder control of an external device – Slide or movie projectors
Patent
1981-01-12
1983-04-05
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Recorder control of an external device
Slide or movie projectors
353 15, G11B 3100
Patent
active
043793126
ABSTRACT:
A system for the control and synchronization of magnetic tape and filmstrip in an audio-visual projector. Film is advanced by means of recorded advance tones on the magnetic tape which are detected by a tone detector to generate an advance pulse. An advance counter is incremented responsive to each advance pulse and decremented as the film advances each frame. The output of the advance counter actuates a film-advance mechanism unless the contents of the counter are zero, so that synchronization is maintained even if the rate at which the advance pulses occur exceeds the operating speed of the film-advance mechanism. Means are provided to automatically synchronize the tape and film at predetermined locations by optically sensing markers affixed to the tape and film. The system may also advance the tape independently of the film in either a fast-forward or a regular-speed mode or it may advance the film independently of the tape.
REFERENCES:
patent: 3881185 (1975-04-01), Broline
patent: 3979774 (1976-09-01), Chen et al.
patent: 3995315 (1976-11-01), Miller
patent: 4027958 (1977-06-01), Shigeta et al.
patent: 4072989 (1978-02-01), Grant
patent: 4075668 (1978-02-01), Keach
patent: 4115824 (1978-09-01), Mindell
patent: 4165159 (1979-08-01), Landau et al.
patent: 4183632 (1980-01-01), Nutting et al.
Eddleman Alfred H.
Indal Corp.
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