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More About This Title Acoustic Echo and Noise Control: A PracticalApproach
English
Presents a detailed description of practical methods to control echo and noise
Develops a statistical theory for optimal control parameters and presents practical estimation and approximation methods
English
GERHARD SCHMIDT, Dr.-Ing., is a Research Engineer at Temic Speech Dialog Systems in Ulm, Germany.
English
List of Tables.
Preface.
Acknowledgments.
Abbreviations and Acronyms.
Part I:Basics.
1Introduction.
1.1 Some History.
1.2 Overview of the Book.
2Acoustic Echo and Noise Control Systems.
2.1 Notation.
2.2 Applications.
3Fundamentals.
3.1 Signals.
3.2 Acoustic Echoes.
3.3 Standards.
Part II:Algorithms.
4Error Criteria and Cost Functions.
4.1 Error Criteria for Adaptive Filters.
4.2 Error Criteria for Filter Design.
4.3 Error Criteria for Speech Processing and Control Purposes.
5Wiener Filter.
5.1 Time-Domain Solution.
5.2 Frequency-Domain Solution.
6Linear Prediction.
6.1 Normal Equations.
6.2 Levinson{Durbin Recursion.
7Algorithms for Adaptive Filters.
7.1 The Normalized Least Mean Square Algorithm.
7.2 The Affine Projection Algorithm.
7.3 The Recursive Least Squares Algorithm.
7.4 The Kalman Algorithm.
Part III:Acoustic Echo and Noise Control.
8Traditional Methods for Stabilization of Electroacoustic Loops.
8.1 Adaptive Line Enhancement.
8.2 Frequency Shift.
8.3 Controlled Attenuation.
9Echo Cancellation.
9.1 Processing Structures.
9.2 Stereophonic and Multichannel Echo Cancellation.
10Residual Echo and Noise Suppression.
10.1 Basics.
10.2 Suppression of Residual Echoes.
10.3 Suppression of Background Noise.
10.4 Combining Background Noise and Residual Echo Suppression.
11Beamforming.
11.1 Basics.
11.2 Characteristics of Microphone Arrays.
11.3 Fixed Beamforming.
11.4 Adaptive Beamforming.
Part IV:Control and Implementation Issues.
12System Control—Basic Aspects.
12.1 Convergence versus Divergence Speed.
12.2 System Levels for Control Design.
13Control of Echo Cancellation Systems.
13.1 Pseudooptimal Control Parameters for the NLMS Algorithm.
13.2 Pseudooptimal Control Parameters for the Affine Projection Algorithm.
13.3 Summary of Pseudooptimal Control Parameters.
13.4 Detection and Estimation Methods.
13.5 Detector Overview and Combined Control Methods.
14Control of Noise and Echo Suppression Systems.
14.1 Estimation of Spectral Power Density of Background Noise.
14.2 Musical Noise.
14.3 Control of Filter Characteristics.
15Control for Beamforming.
15.1 Practical Problems.
15.2 Stepsize Control.
16Implementation Issues.
16.1 Quantization Errors.
16.2 Number Representation Errors.
16.3 Arithmetical Errors.
16.4 Fixed Point versus Floating Point.
16.5 Quantization of Filter Taps.
Part V:Outlook and Appendixes.
17Outlook.
Appendix A:Subband Impulse Responses.
A.1 Consequences for Subband Echo Cancellation.
A.2 Transformation.
A.3 Concluding Remarks.
Appendix B:Filterbank Design.
B.1 Conditions for Approximately Perfect Reconstruction.
B.2 Filter Design Using a Product Approach.
B.3 Design of Prototype Lowpass Filters.
B.4 Analysis of Prototype Filters and the Filterbank System.
References.
Index.
