Title MATLAB software for the code excited linear prediction algorithm : the Federal Standard, 1016 / Karthikeyan N. Ramamurthy and Andreas S. Spanias

Published [San Rafael, Calif.] : Morgan & Claypool Publishers, [2009] ©2009

Online access available from: Synthesis Digital Library    View Resource Record

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Description 1 online resource (viii, 99 pages) : illustrations Series Synthesis lectures on algorithms and software in engineering, 1938-1735 ; #3 Synthesis lectures on algorithms and software in engineering ; #3 Contents 1. Introduction to linear predictive coding -- Linear predictive coding -- Vocal tract parameter estimation -- Excitation, gain and pitch period -- Linear prediction parameter transformations -- Long-term prediction -- Analysis-by-synthesis linear prediction -- Code excited linear prediction algorithms -- The Federal Standard-1016 CELP -- Summary 2. Autocorrelation analysis and linear prediction -- Framing and windowing the input speech -- Computation of autocorrelation lags -- The Levinson-Durbin recursion -- Bandwidth expansion -- Inverse Levinson-Durbin recursion -- Summary 3. Line spectral frequency computation -- Construction of LSP polynomials -- Computing the zeros of the symmetric polynomial -- Computing the zeros of the anti-symmetric polynomial -- Testing Ill-conditioned cases -- Quantizing the line spectral frequencies -- Adjusting quantization to preserve monotonicity -- Summary 4. Spectral distortion -- Conversion of LSP to direct-form coefficients -- Computation of autocorrelation lags from reflection coefficients -- Calculation of distance measures -- Summary 5. The codebook search -- Overview of codebook search procedure -- Adaptive codebook search -- Target signal for adaptive codebook search -- Integer delay search -- Sub-multiple/fractional delay search -- Stochastic codebook search -- Target signal for stochastic codebook search -- Search for best codevector -- Bitstream generation -- Summary 6. The FS-1016 decoder -- Extracting parameters for synthesis -- LP synthesis -- Postfiltering output speech -- Computing distance measures -- Summary -- Bibliography -- Authors' biographies Summary This book describes several modules of the Code Excited Linear Prediction (CELP) algorithm. The authors use the Federal Standard-1016 CELP MATLAB software to describe in detail several functions and parameter computations associated with analysis-by-synthesis linear prediction. The book begins with a description of the basics of linear prediction followed by an overview of the FS-1016 CELP algorithm. Subsequent chapters describe the various modules of the CELP algorithm in detail. In each chapter, an overall functional description of CELP modules is provided along with detailed illustrations of their MATLAB implementation. Several code examples and plots are provided to highlight some of the key CELP concepts. The MATLAB code within this book can be found at http://www.morganclaypool.com/page/fs1016 Bibliography Includes bibliographical references (pages 93-98) Subject Coding theory. Prediction theory. Signal processing -- Mathematical models. Speech processing systems -- Mathematical models. Vocoder. Form Electronic book Author Spanias, Andreas. ISBN 1608453855 9781608453856 (paperback) (paperback)

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