Solid state time base corrector (TBC)
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJohn L. Piri, Marc L. Moulton
Life of this patent
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Abstract
Synchronization of remotely originating video signals to a standardized fuency is assured on a field-by-field basis. The video signals are digitized, multiplexed and stored in fields in accordance with their horizontal and vertical sync signals. A reading out of storage, demultiplexing and reconversion to video signals at the standardized frequency on a field-by-field basis allows a real time presentation to standard equipments at a standardize rates.
Claims8
An apparatus for synchronizing an externally originating video field signal with a local standard frequency source comprising:
- means for providing the externally originating video field signal;
- means coupled to receive the externally originating video field signal for stripping and separating the vertical and horizontal sync pulses;
- means coupled to receive the externally originating field signal for converting it to digital form;
- means for storing one field of said digital form of the externally originating video field signal;
- means for generating the local standard frequency;
- means coupled to the generating means and the converting means for correcting the phase of the converting means to convert the externally originating video field signal at 4 MHZ;
- means coupled to the phase correcting means and the storing means for timing digital data storage therein;
- means connected to the timing means, the storing means and the stripping and separating means for initiating the storing of sequential lines of the externally originating signal with the horizontal sync signal and sequential fields of the sequential lines with the vertical sync signal;
- means connected to the generating means and the storing means for extracting a stored field of lines from the storing means;
- means coupled to the storing means to receive the extracted stored field of lines for multiplexing the signal therein in sync with the local standard frequency at standard video field rates;
- and
- means coupled to the multiplexing means for reconverting digital data to analog form.
Dependencies are inferred from the claim text.