Appeal No. 1996-1767 Page 2
Application No. 08/220,410
February 21, 1995, which was denied entry. We affirm-in-part
and enter a new ground of rejection under 37 CFR § 1.196(b).
BACKGROUND
The invention at issue in this appeal relates to digital
filters. It is an interleaved/retimed (IR) architecture for a
lattice wave digital filter (LWDF). Prior architectures
confront a designer with a trade-off between the amount of
hardware needed to implement an LWDF and the variety of
transfer functions that can be implemented thereby. The IR
architecture reduces the amount of hardware needed without
sacrificing variety.
Claim 1, which is representative for our purposes,
follows:
1. An interleaved all-pass section for a
lattice wave digital filter, comprising:
input means for inputting two interleaved
signals, said two interleaved signals being input at
a predetermined sampling frequency;
a first adder/multiplier network (AMN) connected
to said input means to receive said two interleaved
signals;
a second adder/multiplier network (AMN) to
output two output signals, said two output signals
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