Angular Distribution Analysis in Acoustics

Angular Distribution Analysis in Acoustics
Author: Stephen M. Baxter
Publisher: Springer Science & Business Media
Total Pages: 210
Release: 2012-12-06
Genre: Technology & Engineering
ISBN: 3642827020

The purpose of this book is to j.ir€'~ 0l'l\' a new technique for the experimental investigation of the free wave model sound field of acoustics. The technique is based on the use of spherical harmonic functions of angle. Acousticians frequently encounter random sound fields whose properties may be closely modelled by use of the "free wave" field. This model field is defined by two basic statistical properties: stationarity in time, and homogeneity in space. Stationarity means that any single order statistic measured by a microphone in the field will be independent of the time at which the recording is taken, while homogeneity means that the measurement will also be independent of the mic- phone's position in the field. Furthermore, second order statistics obtained from the measurements of two microphones will depend only on the time lapse between the two recordings, and the relative spatial separation of the micro phones, and not on the microphones' absolute positions in space and time. The free wave field may also (equivalently) be pictured as a collection of plane sound waves which approach an observation position from all angles. These are the "free waves" of the title, with no correlation between waves at different angles and frequencies, although there may exist an angle-dependant plane wave density function. This is a measure of the density of sound energy arriving from different angles. The free wave field has proved to be a simple but remarkably powerful model.

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Report
Author: Finn Jacobsen
Publisher:
Total Pages:
Release: 1979
Genre:
ISBN:

Acoustics, Information, and Communication

Acoustics, Information, and Communication
Author: Ning Xiang
Publisher: Springer
Total Pages: 468
Release: 2014-07-17
Genre: Science
ISBN: 3319056603

This book explores the life and scientific legacy of Manfred Schroeder through personal reflections, scientific essays and Schroeder’s own memoirs. Reflecting the wide range of Schroeder’s activities, the first part of the book contains thirteen articles written by his colleagues and former students. Topics discussed include his early, pioneering contributions to the understanding of statistical room acoustics and to the measurement of reverberation time; his introduction of digital signal processing methods into acoustics; his use of ray tracing methods to study sound decay in rooms and his achievements in echo and feedback suppression and in noise reduction. Other chapters cover his seminal research in speech processing including the use of predictive coding to reduce audio bandwidth which led to various code-excited linear prediction schemes, today used extensively for speech coding. Several chapters discuss Schroeder’s work in low-peak factor signals, number theory, and maximum-length sequences with key applications in hearing research, diffraction gratings, artificial reverberators and de-correlation techniques for enhancing subjective envelopment in surround sound. In style, the articles range from truly scientific to conversationally personal. In all contributions, the relationship between the current research presented and Manfred Schroeder’s own fields of interest is, in general, evident. The second part of the book consists of Schroeder’s own memoirs, written over the final decade of his life. These recollections shed light on many aspects not only of Schroeder’s life but also on that of many of his colleagues, friends and contemporaries. They portray political, social and scientific events over a period that extends from pre-war to the present. These memoirs, written in an inimitable and witty style, are full of information, entertaining and fun to read, providing key insight into the life and work of one of the greatest acousticians of the 20th century.

The Nature and Technology of Acoustic Space

The Nature and Technology of Acoustic Space
Author: Mikio Tohyama
Publisher: Elsevier
Total Pages: 344
Release: 1995-10-05
Genre: Science
ISBN: 9780126925906

Discusses the acoustics and vibrations theories within the framework of modern communication and information science. Topics include: the techniques of signal analysis; sound propagation; intensity distributions; subjective and physiological responses to sound fields; and sound field control.

Industrial Noise Control

Industrial Noise Control
Author: Bell
Publisher: CRC Press
Total Pages: 682
Release: 2017-11-01
Genre: Technology & Engineering
ISBN: 1351438743

Illustrates the latest solutions to real problems occurring in industry, buildings, and communities. Second Edition offers many more 13roblem sets and end-of-chapter exercises as well as up-to-the-minute coverage of new topics.

Industrial Noise Control

Industrial Noise Control
Author: Bell
Publisher: Routledge
Total Pages: 686
Release: 2017-11-01
Genre: Technology & Engineering
ISBN: 1351438735

Illustrates the latest solutions to real problems occurring in industry, buildings, and communities. Second Edition offers many more 13roblem sets and end-of-chapter exercises as well as up-to-the-minute coverage of new topics.

Foundations of Engineering Acoustics

Foundations of Engineering Acoustics
Author: Frank J. Fahy
Publisher: Elsevier
Total Pages: 465
Release: 2000-09-12
Genre: Technology & Engineering
ISBN: 0080506836

Foundations of Engineering Acoustics takes the reader on a journey from a qualitative introduction to the physical nature of sound, explained in terms of common experience, to mathematical models and analytical results which underlie the techniques applied by the engineering industry to improve the acoustic performance of their products. The book is distinguished by extensive descriptions and explanations of audio-frequency acoustic phenomena and their relevance to engineering, supported by a wealth of diagrams, and by a guide for teachers of tried and tested class demonstrations and laboratory-based experiments. Foundations of Engineering Acoustics is a textbook suitable for both senior undergraduate and postgraduate courses in mechanical, aerospace, marine, and possibly electrical and civil engineering schools at universities. It will be a valuable reference for academic teachers and researchers and will also assist Industrial Acoustic Group staff and Consultants. - Comprehensive and up-to-date: broad coverage, many illustrations, questions, elaborated answers, references and a bibliography - Introductory chapter on the importance of sound in technology and the role of the engineering acoustician - Deals with the fundamental concepts, principles, theories and forms of mathematical representation, rather than methodology - Frequent reference to practical applications and contemporary technology - Emphasizes qualitative, physical introductions to each principal as an entrée to mathematical analysis for the less theoretically oriented readers and courses - Provides a 'cook book' of demonstrations and laboratory-based experiments for teachers - Useful for discussing acoustical problems with non-expert clients/managers because the descriptive sections are couched in largely non-technical language and any jargon is explained - Draws on the vast pedagogic experience of the writer