The FDN can be seen as a vector feedback comb filter,3.10obtained 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 time-update for this FDN can be written
as
![]() |
(3.7) |
![]() |
![]() |
![]() |
(3.8) |
![]() |
![]() |
![]() |
(3.9) |