Soft-db Zen-Ten User guide Manuel d'utilisateur télécharger pdf (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

enerator. The out

ut of this

enerator is added to the reference si

nals. The

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Soft-db Zen-Ten User guide Manuel d'utilisateur Page 10