Audio-visual presentation device

An audio-visual presentation device including magnetic tape drive means adapted to move a magnetic recording tape in a forward and reverse direction at first and second speeds with said second speed being greater than said first speed, a said tape having at least one region in which a series of audio signal portions are recorded with each of said audio signal portions being preceded by a visual advance control signal, said device providing audio output in response to said audio signal portions and adapted for providing electrical control of the cycling of an optical projector having a remotely and electrically controllable singal frame advance mechanism in response to one of said visual advance signals whereby during a normal automatic forward operation of said tape drive means at said first speed said device provides audio output and optical projector control such that said audio output and a display by said optical projector remain in synchronization with the visual advance signal preceding each of such audio signal portions initiating a single frame cycle command to the optical projector, said device including a first manually actuated switch means having first and second positions, said switch means when in said first position providing normal automatic forward operation at said first tape drive speed and when in said second position providing reverse direction control to said tape drive means at said second tape drive speed with the visual advance signals on the tape automatically controlling reverse cycling of said optical projector, wherein the improvement comprises:

• first circuit means for providing a logic control signal that indicates whether the optical projector is cycling;
• and
• second circuit means operatively connected to said first switch means for responding to the position of said first switch and operatively connected to said first circuit means for responding to said logic control signal to provide a reverse control signal, when said first switch means is in said second position, for use in initiating reverse movement for the magnetic tape and for use with the single frame cycle commands in initiating reverse operation of the optical projector, provided said first logic control signal indicates the optical projector is not being cycled, whereby synchronization of said audio output and said optical projector display is not lost due to the operation of said first switch means to its second position at the time said logic control signal indicates the projector is cycling.

An audio-visual presentation device including magnetic tape drive means adapted to move a magnetic recording tape in a forward direction, said tape having at least one region in which audio signal portions are recorded with each of said audio signal portions being preceded by a visual advance control signal, said device providing audio output in response to said audio signal portions and adapted for providing electrical control of the cycling of an optical projector having a remotely and electrically controllable single frame advance mechanism in response to one of said visual advance signals whereby during a normal automatic forward operation of said tape drive means said device provides audio output and optical projector control such that said audio output and a display by said optical projector remain in synchronization with the visual advance signal preceding each of such audio signal portions initiating a single frame cycle command to the optical projector, said device having electrical circuitry for detecting the visual advance signals on the magnetic tape and providing said single frame advance command to said projector in response to each such visual advance signal, said electrical circuitry comprising:

• a. filter means connected for receiving said visual advance single and responding to each cycle of said visual advance signal of said visual advance signal that is of a designated frequency band to provide a first signal, said filter means providing a second signal when a signal cycle of said designated frequency band is not received,
• b. signal producing means connected to said filter means to receive said first and second signals, said signal producing means having an output at which an output signal is produced which increases in magnitude so long as said first signal is received, said signal producing means removing said output signal in response to said second signal, and
• c. trigger means connected to the output of said signal producing means for providing a single frame advance command to said projector in response to said output signal increasing to a magnitude sufficient to trigger said trigger means.

An audio-visual presentation device including magnetic tape drive means adapted to move a magnetic recording tape in a forward and a reverse direction at first and second speeds with said second speed being greater than said first speed, said tape having at least one region in which a series of audio signal portions is recorded with each of said audio signal portions being preceded by a visual advance control signal, said device providing audio output in response to said audio signal portions and adapted for providing electrical control of the cycling of an optical projector having a remotely and electrically controllable single frame advance mechanism in response to one of said visual advance signals whereby during a normal automatic forward operation of said tape drive means at said first speed said device provides audio output and optical projector control such that said audio output and a display by said optical projector remain in synchronization with the visual advance signal preceding each of such audio signal portions initiating a single frame cycle command to the optical projector, said device including a first manually actuated switch means having first and second positions, said switch means when in said first position providing normal automatic forward operation at said first tape drive speed and when in said second position providing reverse direction control to said tape drive means at said second tape drive speed with the visual advance signals on the tape automatically controlling reverse cycling of said optical projector, wherein the improvement comprises:

• first circuit means for providing a logic control signal that indicates whether a cycling of the optical projector is completed;
• and
• second circuit means operatively connected to said first switch means for responding to the position of said first switch and operatively connected to said first circuit means for responding to said logic control signal when said first switch means is in said first position to provide a forward control signal for use in initiating forward movement for the magnetic tape and for use with the single frame cycle commands in initiating forward operation of the optical projector, provided said logic control signal indicates completion of an optical projector cycle, whereby, irrespective of the time said first switch means is placed in said first switch position from said second position, the provision of said forward control signal is dependent on the presentation of said logic control signal when said first switch means is in said first switch position.