US3743392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronization means for motion picture projector and tape recorder
Assignee: Fujinon Corp
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Filing: 1971-12-07
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Granted: 1973-07-03
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Expires: 1991-12-07
Abstract
Abstract A motion picture is synchronized with the sound reproduced by a tape recorder. The drive motor of the motion picture projector is controlled by a D.A converter which is provided with a digital input representing the difference in number of pulses between the accumulated number of synchronization pulses generated respectively by the motion picture projector and the tape recorder.
Inventors
- 👤 S Numata
- 👤 T Kagechika
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:39
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
In a system for creating synchronization between a motion picture and the sound therefor by means of pulses generated from a motion picture projector and a tape recorder, a synchronization means comprising means for taking from the motion picture projector pulses the number of which is proportional to the drive speed thereof, means for taking from the tape recorder, prerecorded pulses recorded on the tape at intervals corresponding to those of said pulses generated by the projector, counting and comparing means for counting the accumulated number of each type of pulse, determining the difference in the number of each type of pulses, and generating an output proportional to said difference in number, and means for controlling the driving means of a projector or tape recorder according to the output of said counting and comparing means so as to make the number of both types of pulses equal.
Claim 2
Dependent Claim
147 words
In a system for creating synchronization between a motion picture and the sound therefor by means of pulses generated from a motion picture projector and a tape recorder, a synchronization means comprising means for taking from the motion picture projector pulses the number of which is proportional to the drive speed thereof, means for taking from the tape recorder, prerecorded pulses recorded on the tape at intervals corresponding to those of said pulses generated by the projector, counting and comparing means for counting the accumulated number of each type of pulse, determining the difference in the number of each type of pulses, and generating an output proportional to said difference in number, and means for controlling the driving means of a projector or tape recorder according to the output of said counting and comparing means so as to make the number of both types of pulses equal.
Claim 3
Dependent Claim
21 words
A synchronization means as defined in claim 1 wherein said pulse counting and comparing means comprises an addition and subtraction circuit.
Claim 4
Dependent Claim
46 words
A synchronization means as defined in claim 2 wherein said pulse counting and comparing means further comprises a digital to analog converter for converting the digital output of said circuit into an analog input for controlling the driving means of the projector or the tape recorder.
Claim 5
Dependent Claim
81 words
A synchronization means for synchronizing a motion picture and its sound track, comprising means for cumulatively counting and comparing the number of pulses generated by a motion picture projector and a tape recorder, means for developing a control signal proportional to the difference between the number of said pulses, and means for controlling the film feeding speed of the motion picture projector according to said control signal, whereby the accumulated number of both types of pulses is controlled to be equal.
Claim 6
Dependent Claim
81 words
A synchronization means for synchronizing a motion picture and its sound track, comprising means for cumulatively counting and comparing the number of pulses generated by a motion picture projector and a tape recorder, means for developing a control signal proportional to the difference between the number of said pulses, and means for controlling the film feeding speed of the motion picture projector according to said control signal, whereby the accumulated number of both types of pulses is controlled to be equal.
References Cited (Backward Citations)
US3266862A
Cited
US3441342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |