Film-sound synchronization system

Claim 1

A system for synchronizing projection of a motion picture with playback of sound recorded on a medium separate from the film, said system comprising, in combination: a. a moving picture projector; b. a first line providing electrical power from a source to operate said projector; c. a playback unit including an electric motor for driving the record medium past a stationary pickup means and an electrical sound system for producing audible sound from the movement of said medium past said pickup means; d. a second line providing electrical power from a source to operate said sound system; e. a third line connected between said motor and a source other than through said sound system for providing electrical power to operate said motor; f. manually operable first switch means in said first line for interrupting power to said projector to allow said playback unit to operate at a faster rate than said projector for a selected time interval until synchronism between the motion picture and the sound is restored; and g. manually operable second switch means in said third line for interrupting power to said motor to allow said projector to operate at a faster rate than said playback unit, without interruption of the electrical power operating said sound system, for a selected time interval until synchronism between the motion picture and the sound is restored.

Claim 2

A system for synchronizing projection of a motion picture with playback of sound recorded on a medium separate from the film, said system comprising, in combination: a. a moving picture projector; b. a first line providing electrical power from a source to operate said projector; c. a playback unit including an electric motor for driving the record medium past a stationary pickup means and an electrical sound system for producing audible sound from the movement of said medium past said pickup means; d. a second line providing electrical power from a source to operate said sound system; e. a third line connected between said motor and a source other than through said sound system for providing electrical power to operate said motor; f. manually operable first switch means in said first line for interrupting power to said projector to allow said playback unit to operate at a faster rate than said projector for a selected time interval until synchronism between the motion picture and the sound is restored; and g. manually operable second switch means in said third line for interrupting power to said motor to allow said projector to operate at a faster rate than said playback unit, without interruption of the electrical power operating said sound system, for a selected time interval until synchronism between the motion picture and the sound is restored.

Claim 6

A system for simultaneously filming a motion picture and recording sound on a record medium separate from the film, and for projecting the motion picture and playing back the recorded sound in synchronism, said system comprising: a. a first line providing electrical power from an AC source; b. a recording and playback unit including an electric motor for driving a record medium past a stationary transducer for recording on and picking up from said record medium audible sounds, an electrical system for converting sound to electrical signals and vice versa, and a plurality of switches for starting and stopping movement of said record medium and operation of said electrical system for recording or playing back; c. a movie camera; d. a movie projector; e. means for converting AC power from said source to DC power at a voltage level appropriate to operate said camera; f. a second line connecting said camera to said converting means; g. a first switch in said second line which is closed in response to closure of one of said plurality of switches which initiates movement of said record medium for recording, and is opened in response to closure of another of said plurality of switches which stops movement of said record medium, whereby operation of said camera is started and stopped simultaneously with starting and stopping of recording on said record medium; h. a third line connecting said electrical system to said first line; i. a fourth line connecting said movie projector to said first line; and j. a fifth line connecting said motor to said first line.

Claim 7

A system for simultaneously filming a motion picture and recording sound on a record medium separate from the film, and for projecting the motion picture and playing back the recorded sound in synchronism, said system comprising: a. a first line providing electrical power from an AC source; b. a recording and playback unit including an electric motor for driving a record medium past a stationary transducer for recording on and picking up from said record medium audible sounds, an electrical system for converting sound to electrical signals and vice versa, and a plurality of switches for starting and stopping movement of said record medium and operation of said electrical system for recording or playing back; c. a movie camera; d. a movie projector; e. means for converting AC power from said source to DC power at a voltage level appropriate to operate said camera; f. a second line connecting said camera to said converting means; g. a first switch in said second line which is closed in response to closure of one of said plurality of switches which initiates movement of said record medium for recording, and is opened in response to closure of another of said plurality of switches which stops movement of said record medium, whereby operation of said camera is started and stopped simultaneously with starting and stopping of recording on said record medium; h. a third line connecting said electrical system to said first line; i. a fourth line connecting said movie projector to said first line; and j. a fifth line connecting said motor to said first line.

Claim 14

A system for manually restoring synchronism of projection of a motion picture film with playback of sound recorded on a record medium separate from the film, said system comprising: a. a playback unit including an electric motor for driving the record medium past a stationary pickup means and an electrical sound system for producing audible sound from the movement of said medium past said pickup means; b. a first line providing a regulated voltage to operate said sound system; c. a second line connected between said motor and source other than through said sound system for providing a regulated voltage to operate said motor; and d. manually operable switch means selectively movable to vary the speed of said motor between rates both faster and slower than the normal speed thereof for selected time intervals to restore synchronism between projection of the motion picture and playback of the sound recording without affecting said regulated voltage operating said sound system.

Claim 15

A system for manually restoring synchronism of projection of a motion picture film with playback of sound recorded on a record medium separate from the film, said system comprising: a. a playback unit including an electric motor for driving the record medium past a stationary pickup means and an electrical sound system for producing audible sound from the movement of said medium past said pickup means; b. a first line providing a regulated voltage to operate said sound system; c. a second line connected between said motor and source other than through said sound system for providing a regulated voltage to operate said motor; and d. manually operable switch means selectively movable to vary the speed of said motor between rates both faster and slower than the normal speed thereof for selected time intervals to restore synchronism between projection of the motion picture and playback of the sound recording without affecting said regulated voltage operating said sound system.

Claim 19

A system for manually restoring synchronism of projection of a motion picture film with playback of sound recorded on a record medium separate from the film, said system comprising: a. a playback unit including an electric motor for driving the record medium past a stationary pickup means and an electrical sound system for producing audible sound from the movement of said medium past said pickup means; b. a first line providing a regulated voltage to operate said sound system; c. a second line connected between said motor and source other than through said sound system for providing a regulated voltage to operate said motor; d. manually operable switch means selectively movable to vary the speed of said motor between rates both faster and slower than the normal speed thereof for selected time intervals to restore synchronism between projection of the motion picture and playback of the sound recording without affecting said regulated voltage operating said sound system; and e. light responsive means for connecting said first and second lines with a power source in response to a predetermined increase in the intensity of light incident on a photosensitive element of said light responsive means.

Claim 20

A system for manually restoring synchronism of projection of a motion picture film with playback of sound recorded on a record medium separate from the film, said system comprising: a. a playback unit including an electric motor for driving the record medium past a stationary pickup means and an electrical sound system for producing audible sound from the movement of said medium past said pickup means; b. a first line providing a regulated voltage to operate said sound system; c. a second line connected between said motor and source other than through said sound system for providing a regulated voltage to operate said motor; d. manually operable switch means selectively movable to vary the speed of said motor between rates both faster and slower than the normal speed thereof for selected time intervals to restore synchronism between projection of the motion picture and playback of the sound recording without affecting said regulated voltage operating said sound system; and e. light responsive means for connecting said first and second lines with a power source in response to a predetermined increase in the intensity of light incident on a photosensitive element of said light responsive means.