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Feedback Delay Networks (FDN)
Figure 2.28:
Order 3 MIMO Feedback Delay Network (FDN).

The FDN can be seen as a vector feedback comb filter,^{3.10}obtained by replacing the delay line with a diagonal delay matrix
(defined in Eq.(2.10) below), and replacing the feedback gain
by the product of a diagonal matrix
times an orthogonal
matrix
, as shown in
Fig.2.28 for
. The timeupdate for this FDN can be written
as

(3.6) 
with the outputs given by

(3.7) 
or, in frequencydomain vector notation,
where

(3.10) 
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