| ACKNOWLEDGEMENTS | 第5-6页 |
| Abstract | 第6-7页 |
| 摘要 | 第8-13页 |
| CHAPTER 1 INTRODUCTION | 第13-16页 |
| 1.1 Speech Enhancement Algorithms | 第13-14页 |
| 1.2 Noise Estimation Algorithms | 第14页 |
| 1.3 Thesis Organization | 第14-16页 |
| CHAPTER 2 OVERVIEW OF SPECTRAL ENHANCEMENT TECHNIQUES | 第16-26页 |
| 2.1 Spectral Subtraction | 第16-19页 |
| 2.1.1 Spectral Subtraction Basic Principles | 第16-18页 |
| 2.1.2 Drawbacks of Spectral Subtraction Algorithm | 第18-19页 |
| 2.2 Wiener Filtering | 第19-20页 |
| 2.3 Soft Decision Method | 第20-21页 |
| 2.4 Minimum Mean-Square Error (MMSE) | 第21-26页 |
| 2.4.1 Optimally Modified Log-Spectral Amplitude Estimator (OM-LSA) | 第22-26页 |
| CHAPTER 3 OVERVIEW OF EXISTING NOISE ESTIMATION ALGORITHMS | 第26-37页 |
| 3.1 Minimum Statistics Noise Estimation Algorithm | 第26-29页 |
| 3.1.1 Principles of the Minimum Statistics Method | 第26-28页 |
| 3.1.2 Performance Evaluation | 第28-29页 |
| 3.1.3 Limitations of the Minimum Statistics Method | 第29页 |
| 3.2 Minima Controlled Recursive Averaging (MCRA) | 第29-33页 |
| 3.2.1 Overview of the MCRA Technique | 第29-31页 |
| 3.2.2 Performance Evaluation | 第31-32页 |
| 3.2.3 Limitations of the MCRA Technique | 第32-33页 |
| 3.3 Improved MCRA Algorithm based on Conditional Maximum A Posteriori (MAP) | 第33-35页 |
| 3.4 Continuous Spectral Minima Tracking | 第35页 |
| 3.5 MCRA-2 Algorithm | 第35-37页 |
| CHAPTER 4 PROPOSED ALGORITHMS FOR ENHANCEMENT OF NOISY SPEECHIN ADVERSE ENVIRONMENTS | 第37-56页 |
| 4.1 Proposed Speech Enhancement Method based on Modified MMSE and on an Efficacious Estimator for the A Priori Speech Absence Probability | 第37-48页 |
| 4.1.1 Poposed Gain Modification | 第37-39页 |
| 4.1.2 The Proposed A Priori SNR Estimation | 第39-40页 |
| 4.1.3 The Proposed A Priori Speech Absence Probability (SAP) Estimation Method | 第40-46页 |
| 4.1.4 Performance Evaluation | 第46-48页 |
| 4.2 Proposed Noise Estimation Algorithm | 第48-56页 |
| 4.2.1 Description of the Proposed Noise Estimation Algorithm | 第49-52页 |
| 4.2.2 Performance Evaluation | 第52-56页 |
| CHAPTER 5 SUMMARY AND CONCLUSIONS | 第56-58页 |
| REFERENCES | 第58-62页 |
| APPENDIX A SCHOLARLY PUBLICATION(S) | 第62-63页 |
| APPENDIX B JOINED SCIENTIFIC RESEARCH PROJECTS DURING MASTER'SSTUDIES | 第63页 |
