Directivity Patterns For Room Acoustical Measurements And Simulations

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Directivity Patterns for Room Acoustical Measurements and Simulations

Author : Martin Pollow
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832540903
Total Pages : 192 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Directivity Patterns for Room Acoustical Measurements and Simulations by : Martin Pollow

Download or read book Directivity Patterns for Room Acoustical Measurements and Simulations written by Martin Pollow and published by Logos Verlag Berlin GmbH. This book was released on 2015-09-09 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Measurement of Surface Reflection Properties

Author : Markus Müller-Trapet
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832541209
Total Pages : 220 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Measurement of Surface Reflection Properties by : Markus Müller-Trapet

Download or read book Measurement of Surface Reflection Properties written by Markus Müller-Trapet and published by Logos Verlag Berlin GmbH. This book was released on 2015-10-01 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Combined Wave and Ray Based Room Acoustic Simulations of Small Rooms

Author : Marc Aretz
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832532420
Total Pages : 221 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Combined Wave and Ray Based Room Acoustic Simulations of Small Rooms by : Marc Aretz

Download or read book Combined Wave and Ray Based Room Acoustic Simulations of Small Rooms written by Marc Aretz and published by Logos Verlag Berlin GmbH. This book was released on 2012 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Uncertainties in Acoustical Transfer Functions

Author : Pascal Dietrich
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832535519
Total Pages : 220 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Uncertainties in Acoustical Transfer Functions by : Pascal Dietrich

Download or read book Uncertainties in Acoustical Transfer Functions written by Pascal Dietrich and published by Logos Verlag Berlin GmbH. This book was released on 2013 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Author : Weinzierl, Stefan
Publisher : Universitätsverlag der TU Berlin
ISBN 13 : 3798327041
Total Pages : 200 pages
Book Rating : 4.7/5 (983 download)

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Book Synopsis Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014 by : Weinzierl, Stefan

Download or read book Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014 written by Weinzierl, Stefan and published by Universitätsverlag der TU Berlin. This book was released on 2014 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Directional Room Impulse Response Measurement

Author : Johannes Klein
Publisher :
ISBN 13 : 9783832551391
Total Pages : 240 pages
Book Rating : 4.5/5 (513 download)

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Book Synopsis Directional Room Impulse Response Measurement by : Johannes Klein

Download or read book Directional Room Impulse Response Measurement written by Johannes Klein and published by . This book was released on 2020-07-28 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measured room impulse responses are inextricably linked with the distinct directivity patterns of the applied sources and receivers. In room acoustic measurements, the directivity is often disregarded or intentionally smoothed, waiving detailed information about single reflection paths, also denying the possibility of analyzing and auralizing the acoustic scene in relation to specific real-world sources and receivers. The measurement of directional room impulse responses as a set of measurements with unique directivity patterns can compensate for these shortcomings, retaining the information about the acoustic properties of a room in connection with directional information. Ideally, a directional room impulse response measurement consists of a single session and allows for the flexibility of choosing the desired directivity patterns in post-processing by combining different impulse response sub-sets. Such a procedure requires specialized measurement arrays. The lack of knowledge about the required level of directional detail, physical constraints of the array construction, and expected measurement artifacts hinder and feed-back into the development of the instruments and methods. This thesis explores these requirements and limits, focusing primarily on the design of suitable sources allowing for directional room impulse response measurement procedures with variable directivity.

Head-Related Transfer Function and Virtual Auditory Display

Author : Bosun Xie
Publisher : J. Ross Publishing
ISBN 13 : 1604270705
Total Pages : 505 pages
Book Rating : 4.6/5 (42 download)

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Book Synopsis Head-Related Transfer Function and Virtual Auditory Display by : Bosun Xie

Download or read book Head-Related Transfer Function and Virtual Auditory Display written by Bosun Xie and published by J. Ross Publishing. This book was released on 2013-07-23 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Building Acoustics

Author : Tor Erik Vigran
Publisher : CRC Press
ISBN 13 : 1482266016
Total Pages : 383 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis Building Acoustics by : Tor Erik Vigran

Download or read book Building Acoustics written by Tor Erik Vigran and published by CRC Press. This book was released on 2014-04-21 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building or architectural acoustics is taken in this book to cover all aspects of sound and vibration in buildings. The book covers room acoustics but the main emphasis is on sound insulation and sound absorption and the basic aspects of noise and vibration problems connected to service equipment and external sources. Covering all aspects of sound and vibration in buildings, this book explores room acoustics, sound insulation, and noise and vibration problems connected to service equipment and external sources.

Influences of external error sources on measurements of room acoustic parameters

Author : Martin Guski
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832541462
Total Pages : 176 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Influences of external error sources on measurements of room acoustic parameters by : Martin Guski

Download or read book Influences of external error sources on measurements of room acoustic parameters written by Martin Guski and published by Logos Verlag Berlin GmbH. This book was released on 2015-11-30 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Correct and precise measurements of room acoustic parameters are of fundamental importance for subjective room impression characterization and for the physical description of the sound field. This thesis investigates external influences on acoustic measurements and errors of the resulting room acoustic parameters. Theoretical models have been developed to predict these errors and indicate the tolerable limits of the described influences. To validate these models, specially designed room acoustic measurements that separate the individual influence factors have been conducted. Noise has been identified as one of the main influence factors and occurs during every measurement. In this thesis the performance of five commonly used stationary noise compensation methods are systematically analyzed depending on the peak signal-to-noise ratio. Impulsive noise that could also occur during the measurement is investigated separately, as the previously introduced compensation techniques are unsuited to handle the influence. The second part of this thesis analyzes the influence of time variances during measurements. Inter- and intra-measurement temperature changes, air movement, and human-sized scattering objects have been investigated.

Noise and Vibration Mitigation for Rail Transportation Systems

Author : Jens C.O. Nielsen
Publisher : Springer
ISBN 13 : 3662448327
Total Pages : 724 pages
Book Rating : 4.6/5 (624 download)

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Book Synopsis Noise and Vibration Mitigation for Rail Transportation Systems by : Jens C.O. Nielsen

Download or read book Noise and Vibration Mitigation for Rail Transportation Systems written by Jens C.O. Nielsen and published by Springer. This book was released on 2014-11-05 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reports on the 11th International Workshop on Railway Noise, held on 9 – 13 September, 2013, in Uddevalla, Sweden. The event, which was jointly organized by the Competence Centre Chalmers Railway Mechanics (CHARMEC) and the Departments of Applied Mechanics and Applied Acoustics at Chalmers University of Technology in Gothenburg, Sweden, covered a broad range of topics in the field of railway noise and vibration, including: prospects, legal regulations and perceptions; wheel and rail noise; prediction, measurements and monitoring; ground-borne vibration; squeal noise and structure-borne noise; and aerodynamic noise generated by high-speed trains. Further topics included: resilient track forms; grinding, corrugation and roughness; and interior noise and sound barriers. This book, which consists of a collection of peer-reviewed papers originally submitted to the workshop, not only provides readers with an overview of the latest developments in the field, but also offers scientists and engineers essential support in their daily efforts to identify, understand and solve a number of problems related to railway noise and vibration, and to achieve their ultimate goal of reducing the environmental impact of railway systems.

Handbook for Sound Engineers

Author : Glen Ballou
Publisher : CRC Press
ISBN 13 : 1135016658
Total Pages : 2834 pages
Book Rating : 4.1/5 (35 download)

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Book Synopsis Handbook for Sound Engineers by : Glen Ballou

Download or read book Handbook for Sound Engineers written by Glen Ballou and published by CRC Press. This book was released on 2015-03-05 with total page 2834 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook for Sound Engineers is the most comprehensive reference available for audio engineers, and is a must read for all who work in audio. With contributions from many of the top professionals in the field, including Glen Ballou on interpretation systems, intercoms, assistive listening, and fundamentals and units of measurement, David Miles Huber on MIDI, Bill Whitlock on audio transformers and preamplifiers, Steve Dove on consoles, DAWs, and computers, Pat Brown on fundamentals, gain structures, and test and measurement, Ray Rayburn on virtual systems, digital interfacing, and preamplifiers, Ken Pohlmann on compact discs, and Dr. Wolfgang Ahnert on computer-aided sound system design and room-acoustical fundamentals for auditoriums and concert halls, the Handbook for Sound Engineers is a must for serious audio and acoustic engineers. The fifth edition has been updated to reflect changes in the industry, including added emphasis on increasingly prevalent technologies such as software-based recording systems, digital recording using MP3, WAV files, and mobile devices. New chapters, such as Ken Pohlmann’s Subjective Methods for Evaluating Sound Quality, S. Benjamin Kanters’s Hearing Physiology—Disorders—Conservation, Steve Barbar’s Surround Sound for Cinema, Doug Jones’s Worship Styles in the Christian Church, sit aside completely revamped staples like Ron Baker and Jack Wrightson’s Stadiums and Outdoor Venues, Pat Brown’s Sound System Design, Bob Cordell’s Amplifier Design, Hardy Martin’s Voice Evacuation/Mass Notification Systems, and Tom Danley and Doug Jones’s Loudspeakers. This edition has been honed to bring you the most up-to-date information in the many aspects of audio engineering.

Sound Reinforcement for Audio Engineers

Author : Wolfgang Ahnert
Publisher : CRC Press
ISBN 13 : 1000627098
Total Pages : 450 pages
Book Rating : 4.0/5 (6 download)

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Book Synopsis Sound Reinforcement for Audio Engineers by : Wolfgang Ahnert

Download or read book Sound Reinforcement for Audio Engineers written by Wolfgang Ahnert and published by CRC Press. This book was released on 2022-08-31 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sound Reinforcement for Audio Engineers illustrates the current state of the art in sound reinforcement. Beginning with an outline of various fields of applications, from sports venues to religious venues, corporate environments and cinemas, this book is split into 11 chapters covering room acoustics, loudspeakers, microphones and acoustic modelling among many other topics. This comprehensive book packed with references and a historical overview of sound reinforcement design is an essential reference book for students of acoustics and electrical engineering, but also for engineers looking to expand their knowledge of designing sound reinforcement systems.

Proceedings of the ... International Congress on Acoustics

Author :
Publisher :
ISBN 13 :
Total Pages : 640 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Proceedings of the ... International Congress on Acoustics by :

Download or read book Proceedings of the ... International Congress on Acoustics written by and published by . This book was released on 1995 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Journal of the Acoustical Society of America

Author :
Publisher :
ISBN 13 :
Total Pages : 764 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis The Journal of the Acoustical Society of America by :

Download or read book The Journal of the Acoustical Society of America written by and published by . This book was released on 2009 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Fundamental and Applied Research on Spatial Audio

Author : Brian F.G. Katz
Publisher : BoD – Books on Demand
ISBN 13 : 1839690054
Total Pages : 234 pages
Book Rating : 4.8/5 (396 download)

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Book Synopsis Advances in Fundamental and Applied Research on Spatial Audio by : Brian F.G. Katz

Download or read book Advances in Fundamental and Applied Research on Spatial Audio written by Brian F.G. Katz and published by BoD – Books on Demand. This book was released on 2022-10-05 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatial audio is a dynamic and rapidly evolving field, as it is closely linked to advances in computer technology and digital signal processing. The democratization of virtual reality hardware available as consumer devices has moved the field further out of traditional laboratory research, and directly into applied research targeting a wide range of consumers. Advances in Fundamental and Applied Research on Spatial Audio presents a collection of eight peer-reviewed chapters on this exciting area of research. The contributions are organized into three sections: “Acoustic Methodology”, “Perception”, and “Applications”, and cover a range of topics, addressing both headphone- and loudspeaker-based reproductions, offering both methodological overviews and specific case studies.

Principles And Applications Of Spatial Hearing

Author : Yoiti Suzuki
Publisher : World Scientific
ISBN 13 : 9814465410
Total Pages : 518 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis Principles And Applications Of Spatial Hearing by : Yoiti Suzuki

Download or read book Principles And Applications Of Spatial Hearing written by Yoiti Suzuki and published by World Scientific. This book was released on 2011-03-11 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humans possess a remarkable ability to extract rich three-dimensional information about sound environments simply by analyzing the acoustic signals they receive at their two ears. Research in spatial hearing has evolved from a theoretical discipline studying the basic mechanisms of hearing to a technical discipline focused on designing and implementing increasingly sophisticated spatial auditory display systems. This book contains 39 chapters representing the current state-of-the-art in spatial audio research selected from papers presented in Sendai, Japan, at the First International Workshop on the Principles and Applications of Spatial Hearing.

Auralization

Author : Michael Vorländer
Publisher : Springer Science & Business Media
ISBN 13 : 3540488308
Total Pages : 341 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis Auralization by : Michael Vorländer

Download or read book Auralization written by Michael Vorländer and published by Springer Science & Business Media. This book was released on 2007-10-27 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first focused and detailed textbook on acoustic virtual reality. Auralization is the creation of audible acoustic sceneries from computer-generated data. The term "auralization" is to be understood as being analogue to the well-known technique of "visualization". In visual illustration of scenes, data or any other meaningful information, in movie animation and in computer graphics, we describe the process of "making visible" as visualization. In acoustics, auralization is taking place when acoustic effects, primary sound signals or means of sound reinforcement or sound transmission, are processed to be presented by using electro-acoustic equipment. This book is organized as a comprehensive collection of basics, methodology and strategies of acoustic simulation and auralization.