도서정보
- 저자: E. Hansler, Gerhard Schmidt
- 출판사: Wiley-IEEE Press; 1 edition (May 27, 2004)
- ISBN-10: 0471453463
- ISBN-13: 978-0471453468
내용
Preface.
Acknowledgments.
Abbreviations and Acronyms.
Part I: Basics.
1 Introduction.
1.1 Some History.
1.2 Overview of the Book.
2 Acoustic Echo and Noise Control Systems.
2.1 Notation.
2.2 Applications.
3 Fundamentals.
3.1 Signals.
3.2 Acoustic Echoes.
3.3 Standards.
Part II: Algorithms.
4 Error 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.
5 Wiener Filter.
5.1 Time-Domain Solution.
5.2 Frequency-Domain Solution.
6 Linear Prediction.
6.1 Normal Equations.
6.2 Levinson{Durbin Recursion.
7 Algorithms 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.
8 Traditional Methods for Stabilization of Electroacoustic Loops.
8.1 Adaptive Line Enhancement.
8.2 Frequency Shift.
8.3 Controlled Attenuation.
9 Echo Cancellation.
9.1 Processing Structures.
9.2 Stereophonic and Multichannel Echo Cancellation.
10 Residual 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.
11 Beamforming.
11.1 Basics.
11.2 Characteristics of Microphone Arrays.
11.3 Fixed Beamforming.
11.4 Adaptive Beamforming.
Part IV: Control and Implementation Issues.
12 System Control—Basic Aspects.
12.1 Convergence versus Divergence Speed.
12.2 System Levels for Control Design.
13 Control 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.
14 Control 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.
15 Control for Beamforming.
15.1 Practical Problems.
15.2 Stepsize Control.
16 Implementation 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.
17 Outlook.
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.
서평
음향의 울림과 소음의 진압에 관한 필수적인 이론과 입증된 기법들.
오늘날의 음성통화 시스템들은 이용자의 안락함 그리고 그들의 증가하는 수요와 함께 음향의 소음 진압과 울림의 감소에 초점을 맞추는 것에 대한 인식의 증가를 필요하게 만든다. 현실적인 접근은 다양한 소리 시스템에서 음향의 울림과 소음을 진압하는 것에 대한 입증된 방법들에 대해서 고심한다. 단일통신을 주안점으로, 저자들과 그 분야에서 정평 있는 전문가들과 함께 음향 문제점을 넓은 사업들의 분야에 걸쳐서 이론적인 연구와 현실적인 해결책들의 조합을 서술한다. 음향의 잔향과 소음을 조절하는 것을 위한 현실적인 방법들의 자세한 묘사를 보여주는 것 이외에 그들의 또한 최적의 조절 한계에 대한 이론을 발전시키고 현실적인 판단과 근사치 방법들을 보여준다.