Voice communication is the most important and most common facet of mobile radio service. Even when the predicted surge of wireless data and Internet services becomes a reality, voice will remain the most natural means of human communication. This book equips the reader with a detailed appreciation of the issues in wireless voice communications, treating compression, channel coding and wireless transmission as a joint subject.
PART I: SPEECH SIGNALS AND WAVEFORM CODING.
· Speech Signals and Introduction to Speech Coding.
· Predictive Coding.
PART II: ANALYSIS BY SYNTHESIS CODING.
· Analysis-by-Synthesis Principles.
· Speech Spectral Quantization.
· Regular Pulse Excited Coding.
· Forward-Adaptive Code Excited Linear Prediction.
· Standard Forward-Adaptive CELP Codecs.
· Backward-Adaptive Code Excited Linear Prediction.
PART III: WIDEBAND CODING AND TRANSMISSION.
· Wideband Speech Coding.
PART IV: VERY LOW-RATE CODING AND TRANSMISSION.
· Overview of Low-Rate Speech Coding.
· Linear Predictive Vocoder.
· Wavelets and Pitch Detection.
· Zinc Function Excitation.
· Mixed-Multiband Excitation.
· Sinusoidal Transform Coding Below 4 kbps.
· Conclusions on Low-Rate Coding.
· Comparison of Speech Codecs and Transceivers.
Appendix A: Constructing the Quadratic Spline Wavelets.
Appendix B: Zinc Function Excitation.
Appendix C: Probability Density Function for Amplitudes.
LAJOS HANZO has coauthored five books on mobile radio communications and published more than 300 research papers on a variety of topics in wireless multimedia communications. He holds a chair in telecommunications at the Department of Electronics and Computer Science, University of Southampton, UK and he is an IEEE Distinguished Lecturer.
F. CLARE A. SOMERVILLE is with the Global Wireless Systems Research Department, Bell Laboratories, Swindon, UK. His current research involves real-time techniques for transmission of voice over GPRS and the resultant speech quality attained.
JASON P. WOODARD is with UbiNetics Ltd. where he is responsible for the development and implementation of various algorithms for third-generation mobile communications products.