Soft dB Zen-Ten User guide - Manual (Page 10)

User manual for the ZEN 3-channel X-LMS controller Soft dB inc.
Figure 5: Schematic for the uncoupled version of the control algorithm
The table below describes the nomenclature of each signal and function illustrated in
Figure 5:
Signal or
function Description
Note: x and y are the output / input numbers
Rx(n)
Reference signal x. These signals are filtered by an adjustable high-pass filter to remove
the DC component of the signal.
Cx(n) Output control signals x.
Ex(n)
Error signals x. These signals are filtered by an adjustable high-pass filter to remove the
DC component of the signal.
Mu Normalized adaptative step size. Only one Mu is used for all optimizations.
F_Rx Adjustable band-pass or low-pass filter to force the control on a specific spectral zone.
F_Ex Adjustable band-pass or low-pass filter to force the control on a specific spectral zone.
F_Cx
Adjustable band-pass or low-pass filter to avoid aliasing on control output signals. This
is the same band-pass filter used on the inputs.
Note: this filter can also be optionally removed if required.
CxEy
This filter represents the secondary control path between control output x and error
sensor y.
CxRx
This filter represents the primary control path between control output x and reference
sensor x. Note: even if coupled mode is used, the primary cross-paths (CxRy) are not
used.
Wx Control filter x.
Norm x
Function for the normalization of the adaptative step size. The normalization is done
with the energy of the filtered reference. Note: normalization is done for each LMS
function but even in coupled mode, the secondary cross-path filter is not used for the
normalization.
LMS_x Optimization function (LMS) for control filter x.
W.N. White noise generator. The output of this generator is added to the reference signals. The
ZEN User Manual p. 10