Fixed frequency source timing processor method and apparatus
AssigneeSarnoff Corporation
InventorDavid Andrew Birks
Life of this patent
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Abstract
The decoder method and apparatus receives an information stream comprising timing information and respective payload information. A substantially fixed frequency source is used to generate local timing information, which is used to decode the payload information. A difference signal representing the timing difference between the local timing reference and the received timing information is calculated and used to adjust the decoded payload information signal.
Claims8
A method of processing an information stream comprising remote timing information and respective payload information including video information comprising viewable and non-viewable horizontal video lines, said method comprising the steps of:
- generating local timing information utilizing a fixed frequency source;
- calculating a difference between said remote timing information and said local timing information;
- decoding said payload information using said local timing information signal to produce decoded payload information;
- and
- correction timing errors by selectively increasing or decreasing the duration of non-viewable horizontal video lines.
Apparatus for processing an information stream comprising remote timing information and respective payload information comprising video information comprising viewable and non-viewable horizontal video lines, said apparatus comprising:
- a source of a fixed frequency signal,
- a subtractor coupled to said fixed frequency source, and responsive to said fixed frequency signal and said remote timing information, for producing a difference signal;
- a correction calculator coupled to said subtractor, and responsive to said difference signal, for producing at least horizontal synchronizing signals compatible with a payload information decoder, said correction calculator correcting timing errors by selectively increasing or decreasing the duration of horizontal synchronizing signals associated with non-viewable horizontal video lines.
Dependencies are inferred from the claim text.