Digital Audio Signal Processing

John Wiley, 2008. — 334 p. Digital audio signal processing is employed in recording and storing music and speech signals, for sound mixing and production of digital programs, in digital transmission to broadcast receivers as well as in consumer products like CDs, DATs and PCs. In the latter case, the audio signal is in a digital form all the way from the microphone right up to the loudspeakers, enabling real-time processing with fast digital signal processors. This book provides the basis of an advanced course in Digital Audio Signal Processing which I have been giving since 1992 at the Technical University Hamburg-Harburg. It is directed at students studying engineering, computer science and physics and also for professionals looking for solutions to problems in audio signal processing like in the fields of studio engineering, consumer electronics and multimedia. The mathematical and theoretical fundamentals of digital audio signal processing systems will be presented and typical applications with an emphasis on realization aspects will be discussed. Prior knowledge of systems theory, digital signal processing and multirate signal processing is taken as a prerequisite. The book is divided into two parts. The first part (Chapters 1–4) presents a basis for hardware systems used in digital audio signal processing. The second part (Chapters 5–9) discusses algorithms for processing digital audio signals. Chapter 1 describes the course taken by an audio signal from its recording in a studio up to its reproduction at home. Chapter 2 contains a representation of signal quantization, dither techniques and spectral shaping of quantization errors used for reducing the nonlinear effects of quantization. In the end, a comparison is made between the fixed-point and floatingpoint number representations as well as their associated effects on format conversion and algorithms. Chapter 3 describes methods for AD/DA conversion of signals, starting with Nyquist sampling, methods for oversampling techniques and delta-sigma modulation. The chapter closes with a presentation of some circuit design of AD/DA converters. After an introduction to digital signal processors and digital audio interfaces, Chapter 4 describes simple hardware systems based on a single- and multiprocessor solutions. The algorithms introduced in the following Chapters 5–9 are, to a great extent, implemented in real-time on hardware platforms presented in Chapter 4_. Chapter 5 describes digital audio equalizers. Apart from the implementation aspects of recursive audio filters, nonrecursive linear phase filters based on fast convolution and filter banks are introduced. Filter designs, parametric filter structures and precautions for reducing quantization errors in recursive filters are dealt with in detail. Chapter 6 deals with room simulation. Methods for simulation of artificial room impulse response and methods for approximation of measured impulse responses are discussed. In Chapter 7 the dynamic range control of audio signals is described. These methods are applied at several positions in the audio chain from the microphone up to the loudspeakers in order to adapt to the dynamics of the recording, transmission and listening environment. Chapter 8 contains a presentation of methods for synchronous and asynchronous sampling rate conversion. Efficient algorithms are described which are suitable for real-time processing as well as off-line processing. Both lossless and lossy audio coding are discussed in Chapter 9_. Lossless audio coding is applied for storing of higher word-lengths. Lossy audio coding, on the other hand, plays a significant role in communication systems. Introduction Quantization AD/DA Conversion Audio Processing Systems Equalizers Room Simulation Dynamic Range Control Sampling Rate Conversion Audio Coding

A fully updated second edition of the excellent Digital Audio Signal Processing

Well established in the consumer electronics industry, Digital Audio Signal Processing (DASP) techniques are used in audio CD, computer music and multi-media components. In addition, the applications afforded by this versatile technology now range from real-time signal processing to room simulation.

Digital Audio Signal Processing, Second Edition covers the latest signal processing algorithms for audio processing. Every chapter has been completely revised with an easy to understand introduction into the basics and exercises have been included for self testing. Additional Matlab files and Java Applets have been provided on an accompanying website, which support the book by easy to access application examples.

Key features include:

• A thoroughly updated and revised second edition of the popular Digital Audio Signal Processing, a comprehensive coverage of the topic as whole
• Provides basic principles and fundamentals for Quantization, Filters, Dynamic Range Control, Room Simulation, Sampling Rate Conversion, and Audio Coding
• Includes detailed accounts of studio technology, digital transmission systems, storage media and audio components for home entertainment
• Contains precise algorithm description and applications
• Provides a full account of the techniques of DASP showing their theoretical foundations and practical solutions
• Includes updated computer-based exercises, an accompanying website, and features Web-based Interactive JAVA-Applets for audio processing

This essential guide to digital audio signal processing will serve as an invaluable reference to audio engineering professionals, R&D engineers, researchers in consumer electronics industries and academia, and Hardware and Software developers in IT companies. Advanced students studying multi-media courses will also find this guide of interest. 

"Digital Audio Signal Processing covers the latest signal processing algorithms for audio processing. Every chapter has been completely revised with an easy to understand introduction, and exercises have been included for self testing. Additional Matlab files and Java Applets have been provided on an accompanying website, which support the book by easy to access application examples." "This essential guide to DASP will serve as a reference to audio engineering professionals, R & D engineers, researchers in industries and acidemia, and developers in IT companies. Advanced students studying multimedia courses will also find this book of interest."--Jacket