Appeal No. 2002-1232
Application No. 09/102,885
BACKGROUND
Appellants’ invention relates to an HDTV channel equalizer. An understanding of
the invention can be derived from a reading of exemplary claim 1, which is reproduced
below.
1. A system for processing a received Vestigial Sideband (VSB) modulated
signal containing high definition video information represented by a VSB constellation of
symbols and subject to exhibiting unwanted perturbations, comprising:
a demodulator responsive to said received VSB modulated signal for producing a
baseband demodulated signal; and
an adaptive equalizer having an input for receiving said baseband demodulated
signal and an output at which an equalized baseband signal is produced, said adaptive
equalizer including
(a) an adaptive feed forward filter (FFF) for equalizing said demodulated
signal, said FFF exhibiting (1) linear, non-decision directed blind operation in a first
operating mode, and (2) decision-directed operation in a subsequent second operating
mode; and
(b) an adaptive decision feedback filter (DFF) for equalizing said
demodulated signal, said DFF exhibiting (1) linear, non-decision directed blind
operation in said first operating mode, and (2) non-linear decision-directed operation in
said second operating mode.
The prior art references of record relied upon by the examiner in rejecting the
appealed claims are:
Strolle et al. (Strolle) 5,799,037 Aug. 25, 1998
(filed Sep. 27, 1996)
Werner et al. (Werner) 6,069,917 May 30, 2000
(filed May 23, 1997)
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