Apparatus for recording television images on cine film
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorPhilip J. Mitchell
Life of this patent
Estimating the term…
Abstract
An apparatus for transferring television pictures onto cine film which operates independent of field scan frequency and which synchronizes each frame of the cine film with the television field scans to avoid the appearance of a bar across each frame. The apparatus comprises a cine camera which in operation is placed in front of a television screen and which generates a shutter opening signal, a control unit which synchronizes that signal with the video signal to the television such that the shutter opens at the beginning of a field scan, and a motor drive unit which utilizes the video signal to drive the camera shutter blade at one third the field scan frequency. The apparatus is useful for transferring television field scans operating at any frequency onto cine film.
Claims4
A television recording apparatus for effecting a synchronized transfer of television pictures appearing on a television screen onto cine film in step with the field scan frequency of said television picture, said recording apparatus comprising:
- a cine camera having a shutter, said cine camera including means operable to generate a pulse signal upon each opening of said shutter;
- means responsive to a video signal which is fed to a television screen for deriving a signal at the field scan frequency of said video signal;
- motor drive means for driving the said shutter at a rate proportional to the frequency of said video field scan signal;
- synchronization means jointly responsive to said pulse signal and to said field scan frequency signal, said synchronization means including a comparator having a pair of inputs connected to receive said pulse signal and said field scan frequency signal respectively, a manual phase shift unit having an input connected to receive said field scan frequency signal, and a synchronization indicator, the output of said comparator being connected to said synchronization indicator so that the said manual phase shift unit can be manually adjusted in accordance with the display of the said indicator until said pulse signal and said field scan signal are synchronized when the camera shutter opens at the beginning of a field scan;
- and
- means coupling the output of said manual phase shift unit to said motor drive means.
Dependencies are inferred from the claim text.