US3839733A — Synchronizing system for automatic slide projecto…

Claim 1

Independent Claim 224 words

In combination with a monophonic magnetic tape recording machine which has at least an audio input circuit and an external loudspeaker output circuit, and with a slide projector which has at least an electrically actuated forward advance circuit, the advance circuit having thereacross a low-voltage alternating current, a microphone, an advance trip closure circuit, a programming mechanism connectable between the audio input circuit of the tape recording machine in its recording mode and the forward advance circuit of the slide projector, said mechanism including manually operable momentary switch means connected to said audio input circuit, said microphone and said forward advance circuit for selectively applying said microphone to said input circuit in the normally closed position of said switch and applying said low voltage alternating current to said audio input circuit in the momentary closed position thereof; said programming mechanism including also signal separating means connectable to said external loudspeaker output circuit in the playback mode of said magnetic tape recording machine to be responsive to the signals recorded on a magnetic tape in said recording mode to make audible only those signals recorded from said microphone and to apply only said low voltage alternating current signal to said advance trip closure circuit, whereby slide change and commentary sound are presented in synchronism from the recorded sound and said low voltage alternating current signals,

Claim 2

Dependent Claim 224 words

In combination with a monophonic magnetic tape recording machine which has at least an audio input circuit and an external loudspeaker output circuit, and with a slide projector which has at least an electrically actuated forward advance circuit, the advance circuit having thereacross a low-voltage alternating current, a microphone, an advance trip closure circuit, a programming mechanism connectable between the audio input circuit of the tape recording machine in its recording mode and the forward advance circuit of the slide projector, said mechanism including manually operable momentary switch means connected to said audio input circuit, said microphone and said forward advance circuit for selectively applying said microphone to said input circuit in the normally closed position of said switch and applying said low voltage alternating current to said audio input circuit in the momentary closed position thereof; said programming mechanism including also signal separating means connectable to said external loudspeaker output circuit in the playback mode of said magnetic tape recording machine to be responsive to the signals recorded on a magnetic tape in said recording mode to make audible only those signals recorded from said microphone and to apply only said low voltage alternating current signal to said advance trip closure circuit, whereby slide change and commentary sound are presented in synchronism from the recorded sound and said low voltage alternating current signals,

Claim 3

Dependent Claim 199 words

A mechanism for applying voice or other sound signals and slide projector tripping signals from a source of such projector tripping signals in a slide projector connected to the mechanism synchronously and selectively to the single track of a monophonic magnetic tape recording medium in a monophonic recording machine, said mechanism comprising: a signal actuated switch means connected to the slide projector tripping signal source; a manually operable switching means connected to an external source of sound signals, to a source of tripping signals derived from the slide projector, and to a recording machine for applying the sound or tripping signals selectively to a magnetic tape recording medium in a recording mode of said machine; a loudspeaker; and a signal separating means connected to said loudspeaker, to said signal actuated switch means and to said recording machine and being responsive to the sound signals and the tripping signals on the recording medium in a playback mode of the recording machine for applying said tripping signals to said signal actuated siwtch means and said sound signals to said loudspeaker; whereby slides may be changed in synchronism with the recorded sound signals such as an associated voice commentary and sound effects.

Claim 4

Dependent Claim 199 words

A mechanism for applying voice or other sound signals and slide projector tripping signals from a source of such projector tripping signals in a slide projector connected to the mechanism synchronously and selectively to the single track of a monophonic magnetic tape recording medium in a monophonic recording machine, said mechanism comprising: a signal actuated switch means connected to the slide projector tripping signal source; a manually operable switching means connected to an external source of sound signals, to a source of tripping signals derived from the slide projector, and to a recording machine for applying the sound or tripping signals selectively to a magnetic tape recording medium in a recording mode of said machine; a loudspeaker; and a signal separating means connected to said loudspeaker, to said signal actuated switch means and to said recording machine and being responsive to the sound signals and the tripping signals on the recording medium in a playback mode of the recording machine for applying said tripping signals to said signal actuated siwtch means and said sound signals to said loudspeaker; whereby slides may be changed in synchronism with the recorded sound signals such as an associated voice commentary and sound effects.

Claim 5

Dependent Claim 95 words

In the mechanism defined in claim 2 the signal separating means including: a transformer having a primary and secondary winding, the primary winding being connected between the recording machine and the signal actuated switch means; said loudspeaker being connected to said secondary winding; and a capacitor being connected from saiD connection of said primary winding with said signal actuated switch means to a point of reference potential for by-passing any sound signals to prevent their being applied to said signal actuated switch, thereby permitting only trip signals to be applied to said signal actuated switch.

Claim 6

Dependent Claim 62 words

In the mechanism defined in claim 2 said manually operable switch having a normally closed position for applying signals from said external source of sound signals to said recording machine and a momentary position in which said sound signals are disconnected from said recording machine and said derived tripping signals are applied to said recording machine in place of the sound signals.

Claim 7

Dependent Claim 229 words

For use with an automatically trippable slide projector, having at least a trip connection thereon, and a monophonic magnetic tape recording and playback machine, having an input circuit operable in its recording mode and at least an output circuit operable in its playback mode, a unitary device for tripping the slide projector in response to trip signals which have been recorded on a common track of the magnetic tape along with commentary and other sound signals, the unitary device comprising: a manually operable switching means connected to the input circuit of the magnetic tape recording and playback machine in its recording mode, to a microphone and to the trip connection circuit of the slide projector for applying selectively a trip signal from the trip connection circuit or sound signals from said microphone to said input circuit of said recording and playback machine to be recorded on a common track of a magnetic tape on said machine; a loudspeaker; and an automatic switching and sound transfer circuit connected to the output circuit of said magnetic tape recording and playback machine in its playback mode, to said loudspeaker and to said trip connection circuit of said slide projector for tripping the slide projector in response to said recorded trip signals and for applying said recorded sound signals to said loudspeaker, whereby accompanying sound, commentary and slides are presented in synchronism automatically.

Claim 8

Dependent Claim 229 words

For use with an automatically trippable slide projector, having at least a trip connection thereon, and a monophonic magnetic tape recording and playback machine, having an input circuit operable in its recording mode and at least an output circuit operable in its playback mode, a unitary device for tripping the slide projector in response to trip signals which have been recorded on a common track of the magnetic tape along with commentary and other sound signals, the unitary device comprising: a manually operable switching means connected to the input circuit of the magnetic tape recording and playback machine in its recording mode, to a microphone and to the trip connection circuit of the slide projector for applying selectively a trip signal from the trip connection circuit or sound signals from said microphone to said input circuit of said recording and playback machine to be recorded on a common track of a magnetic tape on said machine; a loudspeaker; and an automatic switching and sound transfer circuit connected to the output circuit of said magnetic tape recording and playback machine in its playback mode, to said loudspeaker and to said trip connection circuit of said slide projector for tripping the slide projector in response to said recorded trip signals and for applying said recorded sound signals to said loudspeaker, whereby accompanying sound, commentary and slides are presented in synchronism automatically.

Claim 9

Dependent Claim 99 words

In the mechanism defined in claim 5 said sound transfer circuit including: an output transformer, having a primary and secondary, said primary being connected from said recording machine output circuit to said automatic switching circuit, said secondary being connected to said loudspeaker; and a capacitor being connected from the junction of said primary with said automatic switching circuit to a point of reference potential thereby forming with said primary a low-pass filter to permit only said trip signals to be applied to said automatic switching circuit, said sound signals being applied to said loudspeaker, and by-passed by said capacitor.

Claim 10

Dependent Claim 71 words

In the mechanism defined in claim 5, said automatic switching circuit including: a silicon controlled rectifier having a pair of terminal connections connected to said trip connection circuit and a gate electrode; and a diode connected between said transfer circuit and said gate for rectifying said recorded trip signal and for applying said rectified signal as a gate signal to actuate said silicon controlled rectifier and thereby to trip said projector.

Claim 11

Dependent Claim 54 words

In the mechanism defined in claim 5, said manually operable switching means having a normally closed position whereby said microphone is connected to said input circuit of said recording machine and a momentary position in which said microphone is disconnected and said trip connection circuit is connected to said input circuit in its place.

Claim 12

Dependent Claim 57 words

In the mechanism defined in claim 8, voltage dividing means connected across said trip conenection circuit and having a divisional junction connected to said switching means for applying a selected portion of the voltage at said trip connection circuit to said input circuit of said recording machine in said momentary position of said manually operable switching means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-09-30	1978-04-01	1978-10-01	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-09-30	1982-04-01	1982-10-01	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-09-30	1986-04-01	1986-10-01	$7700.00	Window Closed / Lapsed

Synchronizing system for automatic slide projectors and monophonic magnetic tape recorders

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