Audio Bandwidth Extension Application of Psychoacoustics, Signal Processing and Loudspeaker Design

by Larsen, Erik; Aarts, Ronald M.

• ISBN13: 9780470858646
• ISBN10: 0470858648
• Edition: 1st
• Format: Hardcover
• Copyright: 2004-10-29
• Publisher: WILEY

Summary

Bandwidth extension (BWE) refers to various methods that increase either the perceived or real frequency spectrum (bandwidth) of audio signals. Such frequency extension is desirable if at some point the frequency content of the audio signal has been reduced, as can happen for example during recording, transmission or reproduction. This volume, significant in dealing exclusively with BWE, discusses applications to music and speech and places particular emphasis on signal processing techniques. Presents an all-encompassing approach to BWE by covering theory, applications and algorithms Reviews important concepts in psychoacoustics, signal processing and loudspeaker theory Develops the theory and implementation of BWE applied to low-frequency sound reproduction, perceptually coded audio, speech and noise abatement Includes a BWE patent overview Audio Bandwidth Extension pulls together recent developments in to a single volume and presents a coherent framework to the reader. Such an approach will have instant appeal to engineers, specialists, researchers and postgraduate students in the fields of audio, signal processing and speech.

Author Biography

Erik Larsen and Ronald M. Aarts are the authors of Audio Bandwidth Extension: Application of Psychoacoustics, Signal Processing and Loudspeaker Design, published by Wiley.

Table of Contents

Preface .

Introduction.

I.1 Bandwidth defined.

I.2 Historic overview.

I.3 Bandwidth extension framework.

1.4 Auditory perception..

2 Psychoacoustic bandwidth extension for low frequencies.

2.1 Introduction.

2.2 Psychoacoustic effects for low-frequency enhancement of small loudspeaker reproduction.

2.3 Low-frequency psychoacoustic bandwidth extension algorithms.

2.4 Low-frequency psychoacoustic bandwidth extension with frequency tracking.

2.5 Subjective performance of low-frequency psychoacoustic bandwidth extension algorithms.

2.6 Spectral characteristics of non-linear devices.

3 Low-frequency physical bandwidth extension.

3.1 Introduction.

3.2 Perceptual considerations.

3.3 Low-frequency physical bandwidth extension algorithms.

3.4 Low-frequency physical bandwidth extension combined with low frequency psychoacoustic bandwidth extension.

4 Special loudspeaker drivers for low-frequency bandwidth extension.

4.1 The force factor.

4.2 High force factor drivers.

4.3 Low force factor drivers.

4.4 Transient respons .

4.5 Details of lumped-element parameters and efficiency.

5 High-frequency bandwidth extension for audio.

5.1 Introduction.

5.2 The limits of deconvolution.

5.3 Perceptual considerations.

5.4 High-frequency bandwidth extension for audio.

5.5 Spectral Band Replication (SBR).

5.6 High-frequency bandwidth extension by instantaneous compression.

6 Bandwidth extension for speech.

6.1 Applications.

6.2 From a speech production model to the bandwidth extension algorithm .

6.3 Extension of the excitation signal.

6.4 Estimation of the wideband spectral envelope.

6.5 Feature selection.

6.6 Codebook mapping.

6.7 Linear mapping .

6.8 Gaussian mixture model.

6.9 Hidden Markov model.

6.10 Discussion.

7 Noise abatement.

7.1 A special kind of noise reduction.

7.2 The noise polution problemócase study.

7.3 The application low-frequency psychoacoustic bandwidth extension to noise pollution.

8 Bandwidth extension patent overview.

Appendix A Multidimensional scaling.

References.

Index.