Television – Nonpictorial data packet in television format – Data separation or detection
Patent
1992-03-11
1995-10-31
Groody, James J.
Television
Nonpictorial data packet in television format
Data separation or detection
348478, 375317, H04N 708
Patent
active
054634237
ABSTRACT:
A data slicer for extracting auxiliary video data from a video signal adapts a data slicing level to the amplitude of the data signal as indicated by the average value of a run-in clock (RIC) signal that is included in the video signal. Control of the slicing level occurs during a window interval that spans a portion of the RIC signal. A comparator compares the video signal to a slicing level established at the output of a digital to analog converter. A digital system monitors the output of the comparator during the RIC window to determine both the existence of auxiliary video data and the accuracy of the slicing level. The slicing level is adjusted in response to the comparator output to establish a slicing level related to the RIC signal amplitude.
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Panasonic Preliminary Information Micro with Caption Decoder; Mar. 14, 1991; pp. 1-1 through 1-4, and 2-1 and 2-6.
Emanuel Peter M.
Grant Chris
Groody James J.
Shedd Robert D.
Thomson Consumer Electronics Inc.
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