Digital Speech, 2Nd Ed

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This book covers all aspects of digital speech coding from an introduction to the background, sampling and analysis, quantisation methods and coders through to the recent research in areas such as voice activity detection and speech enhancement. Table of contents : Preface Acknowledgements Introduction Coding Strategies and Standards · Introduction · Speech Coding Techniques · Algorithm Objectives and Requirements · Standard Speech Coders · Summary · Bibliography Sampling and Quantization · Introduction · Sampling · Scalar Quantization · Vector Quantization · Summary · Bibliography Speech Signal Analysis and Modelling · Introduction · Short-Time Spectral Analysis · Linear Predictive Modelling of Speech Signals · Pitch Prediction · Summary · Bibliography Efficient LPC QuantizationMethods · Introduction · Alternative Representation of LPC · LPC to LSF Transformation · LSF to LPC Transformation · Properties of LSFs · LSF Quantization · Codebook Structures · MSVQ Performance Analysis · Inter-frame Correlation · Improved LSF Estimation Through Anti-Aliasing Filtering · Summary · Bibliography Pitch Estimation and Voiced-Unvoiced Classification of Speech · Introduction · Pitch Estimation Methods · Voiced-Unvoiced Classification · Summary · Bibliography Analysis by Synthesis LPC Coding · Introduction · Generalized AbS Coding · Code-Excited Linear Predictive Coding · Summary · Bibliography Harmonic Speech Coding · Introduction · Sinusoidal Analysis and Synthesis · Parameter Estimation · Common Harmonic Coders · Summary · Bibliography Multimode Speech Coding · Introduction · Design Challenges of a Hybrid Coder · Summary of Hybrid Coders · Synchronized Waveform-Matched Phase Model · Hybrid Encoder · Speech Classification · Hybrid Decoder · Performance Evaluation · Quantization Issues of Hybrid Coder Parameters · Variable Bit Rate Coding · Acoustic Noise and Channel Error Performance · Summary · Bibliography Voice Activity Detection · Introduction · Standard VAD Methods · Likelihood-Ratio-Based VAD · Summary · Bibliography Speech Enhancement · Introduction · Review of STSA-based Speech Enhancement · Noise Adaptation · Echo Cancellation · Summary · Bibliography Index Market Description : Practicing communications engineersResearchers and developers of communications systemsAdvanced students in electrical and electronic engineering About Author : 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.