Television – Nonpictorial data packet in television format – Data separation or detection
Patent
1996-10-25
1997-09-09
Kostak, Victor R.
Television
Nonpictorial data packet in television format
Data separation or detection
348478, H04N 7087
Patent
active
056661673
ABSTRACT:
An auxiliary video information decoder for extracting an auxiliary video information signal from a video signal includes a data slicer and apparatus for adjusting the slicing level of the data slicer. The slicing level is adjusted rapidly until a reference component of the auxiliary information signal is detected during a display interval of the video signal in which auxiliary video information is expected to occur. A count is incremented after display intervals in which the reference component is detected and is decremented after display intervals in which the reference component is not detected. Slicing level adjustment ceases while the count is at least a predetermined number. The apparatus rapidly adapts the slicing level to long-term video signal amplitude changes of significant magnitude (e.g. following a channel change) and maintains a constant slicing level when transient variations occur in the video signal amplitude.
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Emanuel Peter M.
Kostak Victor R.
Shedd Robert D.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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