Appeal No. 2000-1887
Application No. 08/853,075
Appellant’s invention, a data processor selectively modifies the
weighting coefficients in response to an error signal and
selectively increases or decreases the number of weighting
coefficients in response to a characteristic of the weighting
coefficients (specification page 4). As depicted in figures 1
and 3, adaptive filter 102 generates output signal 108 through a
FIR filter using coefficients a0, a1, a2, ..., aN which are stored
at locations 110 of memory 106 (specification, page 9). To
improve the efficiency of the adaptive filter, data processor 118
adjusts the number as well as the values of the coefficients and
stores the new coefficient values in memory 106 (specification,
pages 12 & 13). Thus, dedicating system resources to taps that
contribute little to the output signal can be avoided and the
amount of system resources involved in storing and processing the
history of signals may be reduced (specification, page 11).
Representative independent claim 1 is reproduced below:
1. A signal processing arrangement, comprising:
an adaptive filter, coupled to receive an input signal and
configured and arranged to generate an output signal as a
function of the input signal and a number of weighting
coefficients;
a memory, configured and arranged to store the weighting
coefficients;
2
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