Bandwidth Extension of Speech Using Perceptual Criteria

Bandwidth Extension of Speech Using Perceptual Criteria

Visar Berisha, Steven Sandoval, Julie Liss,
ISBN: 9781627053136 | PDF ISBN: 9781627053143
Copyright © 2013 | 83 Pages | Publication Date: 11/01/2013

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Bandwidth extension of speech is used in the International Telecommunication Union G.729.1 standard in which the narrowband bitstream is combined with quantized high-band parameters. Although this system produces high-quality wideband speech, the additional bits used to represent the high band can be further reduced. In addition to the algorithm used in the G.729.1 standard, bandwidth extension methods based on spectrum prediction have also been proposed. Although these algorithms do not require additional bits, they perform poorly when the correlation between the low and the high band is weak. In this book, two wideband speech coding algorithms that rely on bandwidth extension are developed. The algorithms operate as wrappers around existing narrowband compression schemes. More specifically, in these algorithms, the low band is encoded using an existing toll-quality narrowband system, whereas the high band is generated using the proposed extension techniques. The first method relies only on transmitted high-band information to generate the wideband speech. The second algorithm uses a constrained minimum mean square error estimator that combines transmitted high-band envelope information with a predictive scheme driven by narrowband features. Both algorithms make use of novel perceptual models based on loudness that determine optimum quantization strategies for wideband recovery and synthesis. Objective and subjective evaluations reveal that the proposed system performs at a lower average bit rate while improving speech quality when compared to other similar algorithms.

Table of Contents

Acknowledgments
Figure Credits
Introduction
Principles of Bandwidth Extension
Psychoacoustics
Bandwidth Extension Using Spline Fitting
Summary
Notation
Bibliography
Authors' Biographies

About the Author(s)

Visar Berisha, Arizona State University

Steven Sandoval, Arizona State University

Julie Liss, Arizona State University

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