The FDN can be seen as a vector feedback comb filter,2.6obtained by replacing the delay line with a diagonal delay matrix (defined in Eq. (1.10) below), and replacing the feedback gain by the product of a diagonal matrix times an orthogonal matrix , as shown in Fig. 1.22 for . The time-update for this FDN can be written as
(2.7) |
(2.8) | |||
(2.9) |