Equalizer system including a comb filter in an HDTV system

Details Equalizer system including a comb filter in an HDTV system Equalizer system including a comb filter in an HDTV system

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.

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