typedef struct _ModuleSbAECV2
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 maxTaps;                                // Maximum length of the filter
    INT32 numTaps;                                // Current length of the filter
    FLOAT32 V;                                    // Adaptation constant
    FLOAT32 smoothingTime;                        // Time constant of the smoothing process.
    FLOAT32 A;                                    // Smoothing factor
    FLOAT32 p0;                                   // Starting value for covariance estimate
    INT32 numIter;                                // Number of iterations of adaptive loop
    INT32 enableRNS;                              // Enable residual noise suppression
    INT32 freezePin;                              // Availability of the freeze pin
    INT32 stateIndex;                             // Circular buffer index. [0 numTaps-1]
    INT32 RNS_numPoints;                          // Number of values in the lookup table. The total table size is [maxPoints 2].
    INT32 RNS_order;                              // Order of the interpolation. This can be either 2 (for linear) or 4 (for pchip).
    FLOAT32* WW1;                                 // Adaptive filter coefficients.
    FLOAT32* P;                                   // Real estimation error covariance matrix.
    FLOAT32* CC;                                  // Complex state variables (previous inputs).
    FLOAT32* Pplus;                               // Intermediate result (real scratch).
    FLOAT32* Wplus;                               // Intermediate result (complex scratch).
    FLOAT32* energyC;                             // Intermediate result (real scratch).
    FLOAT32* mu;                                  // Mu value (real).
    FLOAT32* W2;                                  // Residual noise suppression weights.
    FLOAT32* RNS_table;                           // Lookup table. The first row is the X values and the second row is the Y values.
    FLOAT32* RNS_polyCoeffs;                      // Interpolation coefficients returned by the grid control.
} ModuleSbAECV2Class;

 M = sb_aec_v2_module(NAME, MAXTAPS, FREEZEPIN)
 Frequency domain subband echo canceler using a Kalman filter based
 algorithm.  Arguments:
    NAME - name of the module.
    MAXTAPS - maximum length of each frequency domain complex adaptive filter
    FREEZEPIN - If 1, a freeze pin is exposed. The freeze pin, if 1, will
    stop the adaptation of the adaptive filter. (Post filter's adaptation
    is not frozen).