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Theory and Applications of Digital Speech Processing

by: Rabiner, Lawrence; Schafer, Ronald

Theory and Applications of Digital Speech Processing

by: Rabiner, Lawrence; Schafer, Ronald

ISBN 13:
9780136034285
ISBN 10:
0136034284
Edition: 1st
Format: Paperback
Copyright: 03/03/2010
Publisher: Pearson

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Theory and Applications of Digital Speech Processing > ISBN13: 9780136034285

Summary

Clear, up-to-date, and hands-on coverage of digital speech processing.This new textpresents the basic concepts and theories of speech processing with clarity and currency, while providing hands-on computer-based laboratory experiences for students. The material is organized in a manner that builds a strong foundation of basics first, and then concentrates on a range of signal processing methods for representing and processing the speech signal. Every chapter provides insights into the theory, concepts, and implementations of a range of short-time signal processing methods, and their utilization in realizing speech algorithms and speech applications. Suitable for practicing engineers in speech processing.

Author Biography

Lawrence Rabiner was born in Brooklyn, New York, on September 28, 1943. He received the S.B., and S.M. degrees simultaneously in June 1964, and the Ph.D. degree in Electrical Engineering in June 1967, all from the Massachusetts Institute of Technology, Cambridge Massachusetts.

From 1962 through 1964, Dr. Rabiner participated in the cooperative program in Electrical Engineering at AT&T Bell Laboratories, Whippany and Murray Hill, New Jersey. During this period Dr. Rabiner worked on designing digital circuitry, issues in military communications problems, and problems in binaural hearing. Dr. Rabiner joined AT&T Bell Labs in 1967 as a Member of the Technical Staff. He was promoted to Supervisor in 1972, Department Head in 1985, Director in 1990, and Functional Vice President in 1995. He joined the newly created AT&T Labs in 1996 as Director of the Speech and Image Processing Services Research Lab, and was promoted to Vice President of Research in 1998 where he managed a broad research program in communications, computing, and information sciences technologies. Dr. Rabiner retired from AT&T at the end of March 2002 and is now a Professor of Electrical and Computer Engineering at Rutgers University, and the Associate Director of the Center for Advanced Information Processing (CAIP) at Rutgers.

Dr. Rabiner is co-author of the books “Theory and Application of Digital Signal Processing” (Prentice- Hall, 1975), “Digital Processing of Speech Signals” (Prentice-Hall, 1978), “Multirate Digital Signal Processing” (Prentice-Hall, 1983), and “Fundamentals of Speech Recognition” (Prentice-Hall, 1993).

Dr. Rabiner is a member of Eta Kappa Nu, Sigma Xi, Tau Beta Pi, the National Academy of Engineering, the National Academy of Sciences, and a Fellow of the Acoustical Society of America, the IEEE, Bell Laboratories, and AT&T. He is a former President of the IEEE Acoustics, Speech, and Signal Processing Society, a former Vice-President of the Acoustical Society of America, a former editor of the ASSP Transactions, and a former member of the IEEE Proceedings Editorial Board.

Ronald W. Schafer is an electrical engineer notable for his contributions to digital signal processing.

After receiving his Ph.D. degree at MIT in 1968, he joined the Acoustics Research Department at Bell Laboratories, where he did research on digital signal processing and digital speech coding. He came to the Georgia Institute of Technology in 1974, where he stayed until joining Hewlett Packard in March 2005.

He has served as Associate Editor of IEEE Transactions on Acoustics, Speech, and Signal Processing and as Vice-President and President of the IEEE Signal Processing Society. He is a Life Fellow of the IEEE and a Fellow of the Acoustical Society of America.

He has received the IEEE Region 3 Outstanding Engineer Award, the 1980 IEEE Emanuel R. Piore Award, the Distinguished Professor Award at the Georgia Institute of Technology, the 1992 IEEE Education Medal and the 2010 IEEE Jack S. Kilby Signal Processing Medal.

CHAPTER 1 Introduction to Digital Speech Processing 1

1.1 The Speech Signal 3

1.2 The Speech Stack 8

1.3 Applications of Digital Speech Processing 10

1.4 Comment on the References 15

1.5 Summary 17

CHAPTER 2 Review of Fundamentals of Digital Signal Processing 18

2.1 Introduction 18

2.2 Discrete-Time Signals and Systems 18

2.3 Transform Representation of Signals and Systems 22

2.4 Fundamentals of Digital Filters 33

2.5 Sampling 44

2.6 Summary 56

Problems 56

CHAPTER 3 Fundamentals of Human Speech Production 67

3.1 Introduction 67

3.2 The Process of Speech Production 68

3.3 Short-Time Fourier Representation of Speech 81

3.4 Acoustic Phonetics 86

3.5 Distinctive Features of the Phonemes of American English 108

3.6 Summary 110

Problems 110

CHAPTER 4 Hearing, Auditory Models, and Speech Perception 124

4.1 Introduction 124

4.2 The Speech Chain 125

4.3 Anatomy and Function of the Ear 127

4.4 The Perception of Sound 133

4.5 Auditory Models 150

4.6 Human Speech Perception Experiments 158

4.7 Measurement of Speech Quality and Intelligibility 162

4.8 Summary 166

Problems 167

CHAPTER 5 Sound Propagation in the Human Vocal Tract 170

5.1 The Acoustic Theory of Speech Production 170

5.2 Lossless Tube Models 200

5.3 Digital Models for Sampled Speech Signals 219

5.4 Summary 228

Problems 228

CHAPTER 6 Time-Domain Methods for Speech Processing 239

6.1 Introduction 239

6.2 Short-Time Analysis of Speech 242

6.3 Short-Time Energy and Short-Time Magnitude 248

6.4 Short-Time Zero-Crossing Rate 257

6.5 The Short-Time Autocorrelation Function 265

6.6 The Modified Short-Time Autocorrelation Function 273

6.7 The Short-Time Average Magnitude Difference Function 275

6.8 Summary 277

Problems 278

CHAPTER 7 Frequency-Domain Representations 287

7.1 Introduction 287

7.2 Discrete-Time Fourier Analysis 289

7.3 Short-Time Fourier Analysis 292

7.4 Spectrographic Displays 312

7.5 Overlap Addition Method of Synthesis 319

7.6 Filter Bank Summation Method of Synthesis 331

7.7 Time-Decimated Filter Banks 340

7.8 Two-Channel Filter Banks 348

7.9 Implementation of the FBS Method Using the FFT 358

7.10 OLA Revisited 365

7.11 Modifications of the STFT 367

7.12 Summary 379

Problems 380

CHAPTER 8 The Cepstrum and Homomorphic Speech Processing 399

8.1 Introduction 399

8.2 Homomorphic Systems for Convolution 401

8.3 Homomorphic Analysis of the Speech Model 417

8.4 Computing the Short-Time Cepstrum and Complex Cepstrum

of Speech 429

8.5 Homomorphic Filtering of Natural Speech 440

8.6 Cepstrum Analysis of All-Pole Models 456

8.7 Cepstrum Distance Measures 459

8.8 Summary 466

Problems 466

CHAPTER 9 Linear Predictive Analysis of Speech Signals 473

9.1 Introduction 473

9.2 Basic Principles of Linear Predictive Analysis 474

9.3 Computation of the Gain for the Model 486

9.4 Frequency Domain Interpretations of Linear Predictive

Analysis 490

9.5 Solution of the LPC Equations 505

9.6 The Prediction Error Signal 527

9.7 Some Properties of the LPC Polynomial A(z) 538

9.8 Relation of Linear Predictive Analysis to Lossless Tube Models 546

9.9 Alternative Representations of the LP Parameters 551

9.10 Summary 560

Problems 560

CHAPTER 10 Algorithms for Estimating Speech Parameters 578

10.1 Introduction 578

10.2 Median Smoothing and Speech Processing 580

10.3 Speech-Background/Silence Discrimination 586

10.4 A Bayesian Approach to Voiced/Unvoiced/Silence Detection 595

10.5 Pitch Period Estimation (Pitch Detection) 603

10.6 Formant Estimation 635

10.7 Summary 645

Problems 645

CHAPTER 11 Digital Coding of Speech Signals 663

11.1 Introduction 663

11.2 Sampling Speech Signals 667

11.3 A Statistical Model for Speech 669

11.4 Instantaneous Quantization 676

11.5 Adaptive Quantization 706

11.6 Quantizing of Speech Model Parameters 718

11.7 General Theory of Differential Quantization 732

11.8 Delta Modulation 743

11.9 Differential PCM (DPCM) 759

11.10 Enhancements for ADPCM Coders 768

11.11 Analysis-by-Synthesis Speech Coders 783

11.12 Open-Loop Speech Coders 806

11.13 Applications of Speech Coders 814

11.14 Summary 819

Problems 820

CHAPTER 12 Frequency-Domain Coding of Speech and Audio 842

12.1 Introduction 842

12.2 Historical Perspective 844

12.3 Subband Coding 850

12.4 Adaptive Transform Coding 861

12.5 A Perception Model for Audio Coding 866

12.6 MPEG-1 Audio Coding Standard 881

12.7 Other Audio Coding Standards 894

12.8 Summary 894

Problems 895

CHAPTER 13 Text-to-Speech Synthesis Methods 907

13.1 Introduction 907

13.2 Text Analysis 908

13.3 Evolution of Speech Synthesis Methods 914

13.4 Early Speech Synthesis Approaches 916

13.5 Unit Selection Methods 926

13.6 TTS Future Needs 942

13.7 Visual TTS 943

13.8 Summary 947

Problems 947

CHAPTER 14 Automatic Speech Recognition and Natural

Language Understanding 950

14.1 Introduction 950

14.2 Basic ASR Formulation 952

14.3 Overall Speech Recognition Process 953

14.4 Building a Speech Recognition System 954

14.5 The Decision Processes in ASR 957

14.6 Step 3: The Search Problem 971

14.7 Simple ASR System: Isolated Digit Recognition 972

14.8 Performance Evaluation of Speech Recognizers 974

14.9 Spoken Language Understanding 977

14.10 Dialog Management and Spoken Language Generation 980

14.11 User Interfaces 983

14.12 Multimodal User Interfaces 984

14.13 Summary 984

Problems 985

Appendices

A Speech and Audio Processing Demonstrations 993

B Solution of Frequency-Domain Differential Equations 1005

Bibliography 1009

Index 1033

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