Directivity Patterns For Room Acoustical Measurements And Simulations

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Directivity Patterns For Room Acoustical Measurements And Simulations

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Author : Martin Pollow
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2015-09-09

Directivity Patterns For Room Acoustical Measurements And Simulations written by Martin Pollow and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-09 with Technology & Engineering categories.

The acoustics of rooms can be objectively described by the room impulse responses obtained for given transfer paths using measurement or simulation. In practice, the directionally dependent behavior of sources and receivers is often disregarded and thus assumed to be of omnidirectional type. In reality, however, these sources and receivers have specific directivity patterns, which are reported to induce audible differences. In this work a methodology to capture, analyze and process directivity patterns of sources and receivers is described. With the help of surrounding spherical microphone and loudspeaker arrays these directivity patterns are measured to be used in room acoustic applications. Room impulse responses with respect to specific directivity patterns can be realized using compact loudspeaker arrays with known directivity. Applying the results of directivity superposition to the set of measured room impulse responses, the acoustics for specific directivity patterns are found. Using a simulation of the room instead, source and receiver directivity patterns can be included in both wave based and particle based methods. The results of this work facilitate more authentic descriptions of room acoustics for specific source and receiver directivity patterns.

Combined Wave And Ray Based Room Acoustic Simulations Of Small Rooms

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Author : Marc Aretz
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2012

Combined Wave And Ray Based Room Acoustic Simulations Of Small Rooms written by Marc Aretz and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Science categories.

The present thesis establishes a complete framework for the combination of finite element and classical ray based acoustic simulations in small rooms and discusses the inherent challenges and limitations including all aspects of sound generation, sound reflection and sound reception. In this context, the thesis gives detailed guidelines for the best-possible determination of all necessary input data for both simulation domains. The overall potential of the presented combined approach is assessed by conducting extensive objective and subjective comparisons of measurement and simulation results for three types of acoustically relevant small spaces (a scale-model reverberation room, a recording studio and two different car passenger compartments).

Measurement Of Surface Reflection Properties

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Author : Markus Müller-Trapet
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2015-10-01

Measurement Of Surface Reflection Properties written by Markus Müller-Trapet and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-01 with Technology & Engineering categories.

In this thesis, acoustic measurement techniques related to the absorbing as well as the scattering properties of architectural surfaces are investigated. The research is divided into two parts: the first part consists of determining the most relevant causes of uncertainty for the standardized measurement methods of random-incidence absorption and scattering coefficients. A method is developed to determine the necessary minimum number of source-receiver combinations in the reverberation chamber to ensure a specified precision of the absorption or scattering coefficient. The second part of the thesis focuses on a hemispherical microphone array and signal processing steps related to the measurement of angle-dependent reflection properties. Measurements show that the array setup can be used to obtain the angle-dependent absorbing properties of samples with few source positions. With the help of array signal processing methods, the setup can also be used to determine the directional diffusion and scattering coefficient of small samples, yielding the same result as established far-field methods.

Uncertainties In Acoustical Transfer Functions

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Author : Pascal Dietrich
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2013

Uncertainties In Acoustical Transfer Functions written by Pascal Dietrich and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Technology & Engineering categories.

Measured transfer functions of acoustic systems are often used to derive single-number parameters. The uncertainty analysis is commonly focused on the derived parameters but not on the transfer function as the primary quantity. This thesis presents an approach to assess the uncertainty contributions in these transfer functions by using analytic models. Uncertainties caused by the measurement method are analyzed with a focus on the underlying signal processing. In particular, the influence of nonlinearities in the acoustic measurement chain are modeled to predict artifacts in the measured signals and hence the calculated acoustic transfer function. Secondly, characterization methods commonly applied in the field of signal processing are linked to the acoustic scenarios and the main influencing parameters. Acoustic parameters are then derived analytically and by means of Monte Carlo simulations considering the uncertainty of these input parameters. In order to provide airborne applications, analytic models for sound barrier and room acoustic measurements are developed incorporating the directivity and the orientation of the sound source as well as the positions of sources and receivers. The simulated uncertainty contributions are validated by measurements. The same approach is also applied to structure-borne sound applications.

Proceedings Of The Eaa Joint Symposium On Auralization And Ambisonics 2014

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Author : Weinzierl, Stefan
language : en
Publisher: Universitätsverlag der TU Berlin
Release Date : 2014

Proceedings Of The Eaa Joint Symposium On Auralization And Ambisonics 2014 written by Weinzierl, Stefan and has been published by Universitätsverlag der TU Berlin this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

In consideration of the remarkable intensity of research in the field of Virtual Acoustics, including different areas such as sound field analysis and synthesis, spatial audio technologies, and room acoustical modeling and auralization, it seemed about time to organize a second international symposium following the model of the first EAA Auralization Symposium initiated in 2009 by the acoustics group of the former Helsinki University of Technology (now Aalto University). Additionally, research communities which are focused on different approaches to sound field synthesis such as Ambisonics or Wave Field Synthesis have, in the meantime, moved closer together by using increasingly consistent theoretical frameworks. Finally, the quality of virtual acoustic environments is often considered as a result of all processing stages mentioned above, increasing the need for discussions on consistent strategies for evaluation. Thus, it seemed appropriate to integrate two of the most relevant communities, i.e. to combine the 2nd International Auralization Symposium with the 5th International Symposium on Ambisonics and Spherical Acoustics. The Symposia on Ambisonics, initiated in 2009 by the Institute of Electronic Music and Acoustics of the University of Music and Performing Arts in Graz, were traditionally dedicated to problems of spherical sound field analysis and re-synthesis, strategies for the exchange of ambisonics-encoded audio material, and – more than other conferences in this area – the artistic application of spatial audio systems. This publication contains the official conference proceedings. It includes 29 manuscripts which have passed a 3-stage peer-review with a board of about 70 international reviewers involved in the process. Each contribution has already been published individually with a unique DOI on the DepositOnce digital repository of TU Berlin. Some conference contributions have been recommended for resubmission to Acta Acustica united with Acustica, to possibly appear in a Special Issue on Virtual Acoustics in late 2014. These are not published in this collection.

Musical Acoustics Fundamentals

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Author : Nikhil Lakhani
language : en
Publisher: Educohack Press
Release Date : 2025-02-20

Musical Acoustics Fundamentals written by Nikhil Lakhani and has been published by Educohack Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-02-20 with Science categories.

"Musical Acoustics Fundamentals" is a comprehensive guide that delves into the intricate science behind the creation, transmission, and perception of sound in music. We offer an accessible yet in-depth resource for anyone interested in understanding the fundamental principles that govern acoustics in musical contexts. We cover a wide range of topics essential to understanding musical acoustics. Readers will explore the physics of sound waves, vibrations, frequencies, amplitudes, and waveforms, gaining insight into how these elements contribute to the richness and complexity of musical sound. Additionally, we delve into resonance phenomena, harmonic series, overtone generation, and the nuances of timbral richness that characterize different instruments and musical styles. A key focus is on instrumental sound production. Readers will gain a deeper understanding of how various musical instruments, including strings, wind instruments, percussion, and electronic instruments, produce sound. We explore the intricate mechanisms and interactions that result in the diverse tonal palettes and expressive capabilities of different instruments. Moreover, we examine psychoacoustic principles, shedding light on how humans perceive, interpret, and respond to auditory stimuli in music. Topics such as pitch perception, timbre, spatial cues, and masking effects are discussed in detail, providing insights into the perceptual mechanisms that shape our musical experiences. "Musical Acoustics Fundamentals" also delves into room acoustics, examining the influence of room dimensions, materials, and acoustical properties on sound propagation and perception. This section is particularly valuable for optimizing sound recording, mixing, and reproduction techniques in various acoustic environments. Throughout the book, interdisciplinary connections are highlighted, showcasing the collaborative nature of research and innovation in musical acoustics. Real-world case studies, practical applications, and thought-provoking exercises enrich the learning experience, encouraging readers to apply theoretical concepts to practical scenarios. Whether you’re a music enthusiast, musician, audio engineer, educator, researcher, or student, "Musical Acoustics Fundamentals" offers a comprehensive and engaging exploration of the science behind the sounds we hear, deepening your understanding and appreciation of the sonic intricacies that define the world of music.

Head Related Transfer Function And Virtual Auditory Display

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Author : Bosun Xie
language : en
Publisher: J. Ross Publishing
Release Date : 2013-07-23

Head Related Transfer Function And Virtual Auditory Display written by Bosun Xie and has been published by J. Ross Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-07-23 with Technology & Engineering categories.

This book systematically details the basic principles and applications of head-related transfer function (HRTF) and virtual auditory display (VAD), and reviews the latest developments in the field, especially those from the author’s own state-of-the-art research group. Head-Related Transfer Function and Virtual Auditory Display covers binaural hearing and the basic principles, experimental measurements, computation, physical characteristics analyses, filter design, and customization of HRTFs. It also details the principles and applications of VADs, including headphone and loudspeaker-based binaural reproduction, virtual reproduction of stereophonic and multi-channel surround sound, binaural room simulation, rendering systems for dynamic and real-time virtual auditory environments, psychoacoustic evaluation and validation of VADs, and a variety of applications of VADs. This guide provides all the necessary knowledge and latest results for researchers, graduate students, and engineers who work in the field of HRTF and VAD.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1991-05

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-05 with Aeronautics categories.

Proceedings

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Author : British Acoustical Society
language : en
Publisher:
Release Date : 1973

Proceedings written by British Acoustical Society and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Acoustical engineering categories.

Worship Space Acoustics

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Author : Mendel Kleiner
language : en
Publisher: J. Ross Publishing
Release Date : 2010-08-15

Worship Space Acoustics written by Mendel Kleiner and has been published by J. Ross Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-08-15 with Architecture categories.

Worship Space Acoustics is a unique guide to the design, construction, and use of religious facilities for optimum acoustics. The book is divided into two parts: Part 1 discusses methods and techniques of room optimization – how the acoustics of large and small spaces are designed, implemented, and adjusted, and how acoustical privacy is attained; noise and its control as well as sound reinforcement and numerical and physical modeling techniques. Part 2 provides the architect, student, and lay-person a review of the characteristics of the religious services pertinent to various beliefs and how these are provided for in the acoustic design of spaces in synagogues, churches, and mosques.Key Features • Covers the design, construction, and use of religious facilities for optimum acoustics • Presents the historical background to existing practice, problems, and solutions, to deepen understanding for those involved in design, construction and use • Illustrates both the similarities and differences between facilities for different religious groups • Offers a unique reference for those who teach and study, both in architecture and in religious education