Speech Coding Algorithms

• Speech coding is a highly mature branch of signal processing deployed in products such as cellular phones, communication devices, and more recently, voice over internet protocol
• This book collects many of the techniques used in speech coding and presents them in an accessible fashion
• Emphasizes the foundation and evolution of standardized speech coders, covering standards from 1984 to the present
• The theory behind the applications is thoroughly analyzed and proved

Autorentext
WAI C. CHU earned a PhD in Electrical Engineering from the Pennsylvania State University. His industry experience includes positions at Texas Instruments and various startup companies in the multimedia field. Currently at DoCoMo USA Labs (San Jose, California), he is involved with R&D activities in speech/audio coding, digital signal processing, and multimedia applications.

Inhalt

Preface. Acronyms. Notation. Introduction. Signal Processing Techniques. Stochastic Processes and Models. Linear Prediction. Scalar Quantization. Pulse Code Modulation and Its Variants. Vector Quantization. Scalar Quantization of Linear Prediction Coefficient. Linear Prediction Coding. Regular-Pulse Excitation Coders. Code-Excited Linear Prediction. The Federal Standard Version of CELP. Vector Sum Excited Linear Prediction. Low-Delay CELP. Vector Quantization of Linear Prediction Coefficient. Algebraic CELP. Mixed Excitation Linear Prediction. Source-Controlled Variable Bit-Rate CELP. Speech Quality Assessment. Appendix A: Minimum-Phase Property of the Forward Prediction-Error Filter. Appendix B: Some Properties of Line Spectral Frequency. Appendix C: Research Directions in Speech Coding. Appendix D: Linear Combiner for Pattern Classification. Appendix E: CELP: Optimal Long-Term Predictor to Minimize the Weighted Difference. Appendix F: Review of Linear Algebra: Orthogonality, Basis, Linear Independence, and the Gram-Schmidt Algorithm. Bibliography. Index.