The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 2006
Filed:
Mar. 14, 2003
Adolf Dsouza, Westfield, IN (US);
Adolf DSouza, Westfield, IN (US);
Thomson Licensing, Boulogne-Billancourt, FR;
Abstract
An equalizer () and a prefilter () used in conjunction with a comb filter () in a High Definition Television (HDTV) system. The prefilter () may be placed before the comb filter (), or alternatively may be placed after the comb filter. Further, the method may be enhanced by estimating the filter tap when the prefilter () is placed after the comb filter (). The equalizer () 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.