Television – Nonpictorial data packet in television format – Including teletext decoder or display
Patent
1993-12-22
1996-01-09
Groody, James J.
Television
Nonpictorial data packet in television format
Including teletext decoder or display
348465, 348473, 375317, H04N 708
Patent
active
054832896
ABSTRACT:
A circuit and method of data slicing a television signal comprises: an extractor 2 for extracting a specific component from the television signal of analog form; a slicer 3 for slicing the specific component of the television signal produced by the extractor 2 and converting it to its digital form; a decoder 4 for decoding an output of the slicer 3 for display; an initial value storage 10 for storing an initial value of the slice level; slice level controllers 7 and 8 for varying the initial slice level at a predetermined rate; a signal detector 11 for examining whether or not the digitized specific component from the slicer 3 is a desired multiplex signal; a temporary slice level memory 13 for storing the upper and lower levels of the desired multiplex signal detected by the signal detector 11; a calculator 9 for calculating an optimum value of the slice level from the upper and lower levels of the multiplex signal stored in the temporary slice level memory 13; a slice level storage 6 for storing the optimum slice level calculated by the calculator 9; and a controller 14 for selectively feeding the slicer 3 with the optimum slice level retrieved from either the slice level storage 6 or the slice level controllers 7 and 8 according to a resultant judgment of the signal detector 11.
REFERENCES:
patent: 4461002 (1984-07-01), Nanko
patent: 4667235 (1987-05-01), Nozoe et al.
patent: 4688088 (1987-08-01), Hamazaki et al.
patent: 4794626 (1988-12-01), Tanable et al.
patent: 5249050 (1993-09-01), Zato
patent: 5301023 (1994-04-01), Zato
Hashimoto Katsuhiko
Kobayashi Hisao
Nishii Sachiko
Urade Masakazu
Yagi Yukihiro
Groody James J.
Lee Michael H.
Matsushita Electric - Industrial Co., Ltd.
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