Tape machine and slide projector synchronizing device

Details Tape machine and slide projector synchronizing device Tape machine and slide projector synchronizing device

1977-03-14

1978-08-22

Wolff, John H.

Dynamic magnetic information storage or retrieval

Recorder control of an external device

Slide or movie projectors

G11B 2722

Patent

active

041092856

ABSTRACT:
A device for actuating the change mechanism of a slide projector in synchronizm with an audio tape recorder and player comprises a tone decoder including a voltage controlled oscillator in a phase-locked loop associated with a frequency comparator. The oscillator produces slide change signals constituted by square wave pulses in the audio frequency range. The signals are recorded on the tape where slide changes are desired by operating a momentary switch which couples the signals to the recorder through its microphone jack. During playback, the audio signal is fed through a tuned operational amplifier to the tone decoder which responds to the presence of a signal component that compares in frequency with that of the oscillator by performing a switching function which may be used to activate the slide changer of the projector.

REFERENCES:
patent: 3026769 (1962-03-01), Thiele et al.
patent: 3276315 (1966-10-01), Chalfin
patent: 3420966 (1969-01-01), Wright
patent: 3591734 (1971-07-01), Abbott
patent: 3839733 (1974-10-01), Schechter
patent: 3841744 (1974-10-01), Rubin

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