Digital logic control for audio visual programs and method there

Details Digital logic control for audio visual programs and method there Digital logic control for audio visual programs and method there

1975-12-18

1978-02-21

Stephan, Steven L.

Dynamic magnetic information storage or retrieval

Recorder control of an external device

Slide or movie projectors

35 8A, 353 15, G03B 3100, G11B 3100, G09B 100, G03B 2100

Patent

active

040756688

ABSTRACT:
The present disclosure is directed to a logic control system for maintaining sync between an audio tape program and a slide or film projector by adding a signal track to the tape on which is recorded a tape stop signal and projector frame change signal which through a digital logic control circuit synchronization between the audio and visual components is preserved irrespective of tape speed or direction.

REFERENCES:
patent: 2787669 (1957-04-01), Flan et al.
patent: 3756715 (1973-09-01), Naf
patent: 3881185 (1975-04-01), Broline
Telex Brochure, Instructional Cassette Equipment, 10/73.

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