Audio Coding Theory and Applications
Audio Coding: Theory and Applications provides succinct coverage of audio coding technologies that are widely used in modern audio coding standards. Delivered from the perspective of an engineer, this book articulates how signal processing is used in the
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Yuli You
Audio Coding Theory and Applications
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Yuli You, Ph.D. University of Minnesota in Twin Cities
ISBN 978-1-4419-1753-9 e-ISBN 978-1-4419-1754-6 DOI 10.1007/978-1-4419-1754-6 Springer New York Dordrecht Heidelberg London Library of Congress Control Number: 2010931862 c Springer Science+Business Media, LLC 2010 All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)
To My parents and Wenjie, Amy and Alan
Preface
Since branching out of speech coding in the early 1970s, audio coding has now slipped into our daily lives in a variety of applications, such as mobile music/video players, digital television/audio broadcasting, optical discs, online media streaming, and electronic games. It has become one of the essential technologies in today’s consumer electronics and broadcasting equipments. In its more than 30 years of evolution, many audio coding technologies had come into the spotlight and then became obsolete, but only a minority have survived and are deployed in major modern audio coding algorithms. While covering all the major turns and branches of this evolution is valuable for technology historians or for people with intense interests, it is distracting and even inundating for most readers. Therefore, those historic events will be omitted and this book will, instead, focus on the current state of this evolution. Such a focus also helps to provide full coverage to selected topics in this book. This state of the art is presented from the perspective of a practicing engineer and adjunct associate professor, who single-handedly developed the whole DRA audio coding standard, from algorithm architecture to assembly-code implementation and to subjective listening tests. This perspective has a clear focus on “why” and “how to.” In particular, many purely theoretical details such as proof of perfect reconstruction property of various filter banks are omitted. Instead, the emphasis is on the motivation for a particular technology, why it is useful, what it is, and how it is integrated into a complete algorithm and implemented in practical products. Consequently, many practical aspects of audio coding technologies normally excluded in audio coding books, such as transient detection and implementation of decoders on low-cost microprocessors, are co
