FDNs as Digital Waveguide Networks
As discussed in §C.15, the FDN using a
Householder-reflection feedback matrix
is equivalent to a network of
digital waveguides
intersecting at a single scattering junction
[463,464,385]. The wave impedance in the
th
waveguide is simply
, the
th element of the
axis-of-reflection vector
. The choice
corresponds to all of the waveguides having the same impedance (the
``isotrophic junction'' case).
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