Appeal No. 2000-1887
Application No. 08/853,075
number of weighting coefficients based on a characteristic of the
weighting coefficients, as recited in claim 1. A review of the
reference confirms Appellant’s position that although Sugiyama
controls the number of taps (coefficients) based on their values,
the number of taps are actually re-distributed based on an
analysis of the coefficients of last P taps (P is an integer) in
each adaptive filter (col. 8, lines 28-31). Sugiyama, in column
8, lines 65-68, further teaches that:
Excess or shortage of number of taps is adjusted by the
number of taps of the adaptive filter corresponding to i-th
subband giving mathematical expression 7.
Therefore, the number of taps determined in each subband filter
is a part of the overall tap numbers associated with filter 60i.
In view of our analysis of Horna and Sugiyama, even
assuming, arguendo, that it would have been obvious to combine
the adaptive filter of Horna with the subband filter of Sugiyama,
as held by the Examiner, we still find that the combination would
have disclosed neither the selectively increasing/decreasing the
number of weighting coefficients nor selectively allocating
system resources for storing the weighting coefficients, as
claimed by Appellant. The subject matter of claim 1 would not,
therefore, have been prima facie obvious because the necessary
teachings and suggestions to combine the adaptive filter of Horna
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