Method and apparatus for recording a digital signal on motion pi

Details Method and apparatus for recording a digital signal on motion pi Method and apparatus for recording a digital signal on motion pi

1983-07-07

1985-01-01

Hix, L. T.

Optics: motion pictures

With film carried control signals

352 12, 354105, 346 20, 346107A, 346108, G03B 1724

Patent

active

044913990

ABSTRACT:
A method and apparatus for recording a digital signal such as a modified SMPTE time code on motion picture film as it is being intermittently advanced by a motion picture camera. The recorded time code includes a set of timing bits followed immediately by a set of synchronization bits. In one embodiment, the time code is recorded as a continuous signal with the last bit recorded for each frame having an extended length, to ensure that uncertainties in the specific times at which the camera begins and ends its advancement of the film don't result in the recording of a bit that is shorter than a nominal bit duration. In a second embodiment, an addition set of synchronization bits is recorded at the beginning of each frame, so that a time code reader assumes it corresponds to the previous frame and properly decodes the following sets of timing bits and synchronization bits as corresponding to the current frame.

REFERENCES:
patent: 3309463 (1967-03-01), Roedl
patent: 3601537 (1971-08-01), Gueldenpfenning et al.
patent: 3603974 (1971-09-01), Copeland, Jr.
patent: 3671112 (1972-06-01), Lennert et al.
patent: 3678200 (1972-07-01), Clark
patent: 3752958 (1973-08-01), Gilberg et al.
patent: 3826566 (1974-07-01), Csontos
patent: 4027243 (1977-05-01), Stackhouse et al.
patent: 4150882 (1979-04-01), Konick

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