Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Reexamination Certificate
2006-08-15
2006-08-15
Kostak, Victor R. (Department: 2614)
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
C348S021000, C375S350000
Reexamination Certificate
active
07092036
ABSTRACT:
An equalizer (34) and a prefilter (1) used in conjunction with a comb filter (2) in a High Definition Television (HDTV) system. The prefilter (1) may be placed before the comb filter (2), or alternatively may be placed after the comb filter. Further, the method may be enhanced by estimating the filter tap when the prefilter (1) is placed after the comb filter (2). The equalizer (34) produces a fifteen level output from the eight level Vestigial Sideband (VSB) input without limiting the amplitude at symbol 12 to a relatively small value, such as −20 dB. Three specific methods of increasing the permissible amplitude at symbol 12 are presented which permit tap 12 amplitudes as high as −6 dB.
REFERENCES:
patent: 5331416 (1994-07-01), Patel et al.
patent: 5512957 (1996-04-01), Hulyalkar
patent: 5602602 (1997-02-01), Hulyalkar
patent: 5777692 (1998-07-01), Ghosh
patent: 6226049 (2001-05-01), Oh
patent: 6384858 (2002-05-01), Limberg
patent: 6826242 (2004-11-01), Ojard et al.
Kostak Victor R.
Kurdyla Ronald H.
Laks Joseph J.
Opalach Joseph J.
Thomson Licensing
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