Digital Signal Processing Reference
In-Depth Information
Wiener filter further processes the error signal reducing the remaining
uncorrelated noise. Since the quality of the error signal is already improved
through adaptive filtering prior to Wiener filtering, it is expected that any
introduced artifacts will be greatly reduced compared to Wiener filtering
alone [4].
Objective evaluations reported in Section 4 confirm this
expectation.
Figure 10-2.
Block diagram of the DSP system.
Wiener filtering is implemented using a frequency-domain generalized
Wiener filter [11]. As shown in Figure 10-3, the (subband) adaptive filter
outputs are multiplied by a time-varying
real gain
; i.e.,
where
