Overview
Frequency domain subband adaptive filter
Discussion
Subband based mono echo canceler. This module works in conjunction with the WOLA filterbank modules. The module has two input pins. The first input is a single channel microphone signal and the second is a mono reference signal.
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The module has optional residual noise suppression which is enabled via the enableRNS variable. By default, residual noise suppression is on and the output of the echo canceler (the error signal) is further reduced in level. The residual noise suppression is configured by a 7 element interpolation table. This table operates just like the Table X-Y module with configurable (X, Y) lookup points. The lookup table specifies values in dB for the input and output function
Type Definition
Code Block |
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typedef struct _ModuleSbAECV3 { 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 FLOAT32 pmin; // (Advanced) Minimum value for P 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; // Intermediate result (real scratch). 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. } ModuleSbAECV3Class; |
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
maxTaps | int | const | 0 | 16 | Unrestricted | samples |
numTaps | int | parameter | 0 | 16 | 1:1:16 | samples |
V | float | const | 0 | 0.5 | Unrestricted | |
smoothingTime | float | parameter | 0 | 10 | 0.1:1000 | sec |
A | float | derived | 0 | 1 | 0:1 | |
p0 | float | parameter | 0 | 1 | Unrestricted | |
numIter | int | parameter | 0 | 3 | 1:20 | |
enableRNS | int | parameter | 0 | 1 | 0:1:1 | |
pmin | float | parameter | 0 | 0.0003 | 1e-08:1 | |
stateIndex | int | state | 1 | 0 | Unrestricted | |
RNS_numPoints | int | const | 1 | 7 | 4:1:1000 | |
RNS_order | int | const | 1 | 2 | 2:2:4 | |
WW1 | float* | state | 0 | [16 x 32] | Unrestricted | |
P | float* | state | 0 | [16 x 32] | Unrestricted | |
CC | float* | state | 0 | [16 x 32] | Unrestricted | |
Pplus | float* | state | 0 | [1 x 16] | Unrestricted | |
Wplus | float* | state | 0 | [1 x 16] | Unrestricted | |
energyC | float* | state | 0 | [16 x 32] | Unrestricted | |
mu | float* | state | 0 | [1 x 16] | Unrestricted | |
W2 | float* | state | 0 | [32 x 1] | Unrestricted | |
RNS_table | float* | parameter | 1 | [2 x 7] | Unrestricted | |
RNS_polyCoeffs | float* | state | 1 | [4 x 6] | Unrestricted |
Pins
Input Pins
Name: dataIn
Description: Micro input
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Sample rate range: Unrestricted
Complex support: Complex
Output Pins
Name: errorSignal
Description: Error signal = difference between filter output and dataIn
Data type: float
MATLAB Usage
File Name: sb_aec_v3_module.m
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