A. M. Kondoz

Digital Speech

Coding for Low Bit Rate Communication Systems

• Gebundenes Buch

Produktbeschreibung

Now in a thoroughly updated second edition, Digital Speech covers all aspects of digital speech coding from an introduction to the background, sampling and analysis, quantization methods, and coders through to the recent research in areas such as voice activity detection and speech enhancement. This is the only book available on the market that covers all of these areas in a single text suitable for both a senior undergraduate looking to learn the basics and researchers and engineers in universities and industry keen to learn the latest developments.

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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.

Produktdetails

• Verlag: Wiley & Sons
• 2. Aufl.
• Seitenzahl: 458
• Erscheinungstermin: 29. Oktober 2004
• Deutsch, Englisch
• Abmessung: 250mm x 173mm x 32mm
• Gewicht: 1000g
• ISBN-13: 9780470870075
• ISBN-10: 0470870079
• Artikelnr.: 14104080

Autorenporträt

Professor Kondoz joined the university of Surrey as a PhD. student in October 1984. From 1986 to 1988 he was employed as a research fellow in the communications group. After completing his PhD, in 1988 he was appointed as a lecturer. In 1995 he became a Reader and in 1997 Professor and Deputy Director in the Centre for Communication Systems Research (CCSR). He has been involved in teaching of digital signal processing, telecommunications theory and source coding in both undergradute and postgraduate levels. In research he has been heading Multimedia Communication Research Group since 1990. To date, Professor Kondoz has supervised 20 successful PhD students in Speech, Video and Channel coding, Source data packetisation, Error resilient speech and video transmission and Mobile multimedia communications. His current research interests are, Low bit rate speech, image and video coding error resilient video transmission, mobile multimedia communications, robust wireless ATM, real-time terminal design and implementation for mobile communications. Outside the University, Professor Kondoz has been a member of both the IEE and IEEE. He is a CEng and served on E5. He is on EPSRC College for signal processing and communications.

Inhaltsangabe

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