Appeal No. 2000-1887
Application No. 08/853,075
and coefficients (col. 4, lines 40-56) and second shift registers
60b and 65b in unit 200 for storing the old samples and
coefficients after the new ones are read into the first register
(col. 4, lines 56-59). We agree with Appellant that these two
sets of registers are indeed shift registers with fixed sizes
that are allocated for storing the signal samples and
coefficients with no regard for their lengths. We again observe
that the Examiner has incorrectly corresponded the fixed length
shift registers of Horna for selectively changing the number of
taps and allocating system resources for storing.
Sugiyama, on the other hand, relates to a system of subband
adaptive filters in which the number of adaptive filter taps
corresponding to each subband is controlled for reducing
computation time (col. 3, lines 11-16). We find that the
teachings relied on by the Examiner (col. 4, lines 37-43) refers
to increasing or decreasing the number of taps of the adaptive
filter based on maximum and minimum power of subband error
signals and not based on a characteristic of the weighting
coefficients used by the adaptive filter. Furthermore, the
Examiner provides no specific correlation between the claimed
features and Sugiyama’s disclosure, nor can we find the necessary
teachings related to selectively increasing or decreasing the
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