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Digital Speech: Coding for Low Bit Rate Communication Systems, 2nd Edition

Book Description

Building on the success of the first edition Digital Speech offers extensive new, updated and revised material based upon the latest research. This Second Edition continues to provide the fundamental technical background required for low bit rate speech coding and the hottest developments in digital speech coding techniques that are applicable to evolving communication systems.

  • Features new chapters on Pitch Estimation and Voice-Unvoiced Classification of Speech, Harmonic Speech Coding and Multimode Speech Coding

  • Presents a comprehensively revised chapter entitled Analysis by Synthesis LPC Coding including specific examples of popular speech coders such as CELP (Code-Excited Linear Predictive) Coding

  • Contains an updated chapter on Efficient LPC Quantization Methods including MSVQ and anti-aliasing filtering

  • Discusses Voice Activity Detection (VAD) methods

  • Offers expanded coverage of speech enhancement techniques such as echo cancellation and noise suppression

Written by a well-known, highly respected academic, this authoritative volume will be invaluable to practising engineers, network designers, computer scientists and advanced students in communications, electrical and electronic engineering.

Table of Contents

  1. Cover Page
  2. Title Page
  3. Copyright
  4. Dedication
  5. Contents
  6. Preface
  7. Acknowledgements
  8. 1: Introduction
  9. 2: Coding Strategies and Standards
    1. 2.1 Introduction
    2. 2.2 Speech Coding Techniques
    3. 2.3 Algorithm Objectives and Requirements
    4. 2.4 Standard Speech Coders
    5. 2.5 Summary
    6. Bibliography
  10. 3: Sampling and Quantization
    1. 3.1 Introduction
    2. 3.2 Sampling
    3. 3.3 Scalar Quantization
    4. 3.4 Vector Quantization
    5. 3.5 Summary
    6. Bibliography
  11. 4: Speech Signal Analysis and Modelling
    1. 4.1 Introduction
    2. 4.2 Short-Time Spectral Analysis
    3. 4.3 Linear Predictive Modelling of Speech Signals
    4. 4.4 Pitch Prediction
    5. 4.5 Summary
    6. Bibliography
  12. 5: Efficient LPC Quantization Methods
    1. 5.1 Introduction
    2. 5.2 Alternative Representation of LPC
    3. 5.3 LPC to LSF Transformation
    4. 5.4 LSF to LPC Transformation
    5. 5.5 Properties of LSFs
    6. 5.6 LSF Quantization
    7. 5.7 Codebook Structures
    8. 5.8 MSVQ Performance Analysis
    9. 5.9 Inter-frame Correlation
    10. 5.10 Improved LSF Estimation Through Anti-Aliasing Filtering
    11. 5.11 Summary
    12. Bibliography
  13. 6: Pitch Estimation and Voiced – Unvoiced Classification of Speech
    1. 6.1 Introduction
    2. 6.2 Pitch Estimation Methods
    3. 6.3 Voiced-Unvoiced Classification
    4. 6.4 Summary
    5. Bibliography
  14. 7: Analysis by Synthesis LPC Coding
    1. 7.1 Introduction
    2. 7.2 Generalized AbS Coding
    3. 7.3 Code-Excited Linear Predictive Coding
    4. 7.4 Summary
    5. Bibliography
  15. 8: Harmonic Speech Coding
    1. 8.1 Introduction
    2. 8.2 Sinusoidal Analysis and Synthesis
    3. 8.3 Parameter Estimation
    4. 8.4 Common Harmonic Coders
    5. 8.5 Summary
    6. Bibliography
  16. 9: Multimode Speech Coding
    1. 9.1 Introduction
    2. 9.2 Design Challenges of a Hybrid Coder
    3. 9.3 Summary of Hybrid Coders
    4. 9.4 Synchronized Waveform-Matched Phase Model
    5. 9.5 Hybrid Encoder
    6. 9.6 Speech Classification
    7. 9.7 Hybrid Decoder
    8. 9.8 Performance Evaluation
    9. 9.9 Quantization Issues of Hybrid Coder Parameters
    10. 9.10 Variable Bit Rate Coding
    11. 9.11 Acoustic Noise and Channel Error Performance
    12. 9.12 Summary
    13. Bibliography
  17. 10: Voice Activity Detection
    1. 10.1 Introduction
    2. 10.2 Standard VAD Methods
    3. 10.3 Likelihood-Ratio-Based VAD
    4. 10.4 Summary
    5. Bibliography
  18. 11: Speech Enhancement
    1. 11.1 Introduction
    2. 11.2 Review of STSA-based Speech Enhancement
    3. 11.3 Noise Adaptation
    4. 11.4 Echo Cancellation
    5. 11.5 Summary
    6. Bibliography
  19. Index