Audibility of edge diffraction in auralization of a stage house

Abstract: This investigation determines the audibility of edge-diffraction when used in auralization of a stage house. Computed impulse responses with varying orders of diffraction are auralized and compared via listening tests. These impulse responses are also compared with measured, auralized impulse responses from a scale model. Results indicate that, for the positions studied, first-order diffraction is significantly more audible than second-order diffraction. Thus, higher-order edge diffraction calculations can possibly be neglected in auralization programs

Influence of a wearer's voice on noise dosimeter measurements

In recent years, interest in personal noise exposure has expanded beyond a workplace safety measure to become an effective means of investigating physiological effects of the acoustic environment on an individual. This work investigates the effects of the wearer's voice as a possible dominant sound source on body-mounted noise dosimeters and develops methods to improve the application of dosimeter measurements in medium-level noise environments. Subjects experienced a controlled set of acoustic conditions while wearing a dosimeter. In each condition, sound pressure levels were recorded with and without the subject speaking controlled phrases. Three experimental variables were considered-room type, noise type, and noise level. All three variables had a statistically significant effect upon the contribution of speech to a dosimeter measurement; for example, noise level was shown to cause a change in speech contribution by as much as 5.5 dB between sequential levels. Based upon the analysis, a method of predicting the decibel contribution of a wearer's voice was developed. The results of this study can be used to estimate the effect of a wearer's voice on dosimeter measurements in medium-level noise environments

Subjective testing of the performance of reverberation enhancement using virtual reality environmens

Presented of the 6th International Conference on Auditory Display (ICAD), Atlanta, GA, April 2-5, 2000Various systems for the purpose of performing subjective audiovisual tests have been evaluated. Auralizations and visualizations of two different halls in the Göteborg University School of Music have been made using CATT-Acoustic and VR-Creator/EON Studio. These simulations have been used in a subjective test for the purpose of evaluating the visual influence on room acoustical parameters, the realism and emotional parameters in a hall equipped with a reverberation enhancement system. The results show that depending on the room and type of stimuli, perceived room size, auditory source width and distance to sound source, are clearly influenced by the visual impression

ISSN exercise & sport nutrition review: research & recommendations

Sports nutrition is a constantly evolving field with hundreds of research papers published annually. For this reason, keeping up to date with the literature is often difficult. This paper is a five year update of the sports nutrition review article published as the lead paper to launch the JISSN in 2004 and presents a well-referenced overview of the current state of the science related to how to optimize training and athletic performance through nutrition. More specifically, this paper provides an overview of: 1.) The definitional category of ergogenic aids and dietary supplements; 2.) How dietary supplements are legally regulated; 3.) How to evaluate the scientific merit of nutritional supplements; 4.) General nutritional strategies to optimize performance and enhance recovery; and, 5.) An overview of our current understanding of the ergogenic value of nutrition and dietary supplementation in regards to weight gain, weight loss, and performance enhancement. Our hope is that ISSN members and individuals interested in sports nutrition find this review useful in their daily practice and consultation with their clients

Electroacoustics

Electroacoustic devices such as microphones and loudspeakers are used everywhere from cars and mobile phones to homes, places of worship, and sports arenas. They are a key part of the modern communication society, helping to transmit information to our ears. A contemporary introduction to the subject, Electroacoustics explains the scientific and engineering principles behind the design of these sound transducers. It also examines the compromises that are necessary when designing transducers for use in the real world.This accessible textbook book is based on the author’s extensive experience teaching electroacoustics to advanced graduate and graduate students. He uses the concept of electrical circuit analogies to help readers quickly grasp the fundamentals of acoustical and mechanical systems. The book covers both traditional electrodynamic audio and ultrasonic transducers and includes up-to-date material on arrays, planar transducers, loudspeaker enclosure design, and more. To meet the needs of a broad range of readers, the book also includes background material on room acoustics, electrical circuits, and electrical filters. Electroacoustic theory is explained in an easy-to-read style without resorting to matrix theory. Throughout, a wealth of illustrations and exercises make the ideas more concrete.The book emphasizes multidisciplinary engineering principles, preparing students for the broad range of applications they may encounter in their research as well as later in their careers. The modern treatment of transducers also makes this a valuable reference for transducer designers, acoustical consultants, hobbyists, and anyone involved in electroacoustic design

Acoustics and Audio Technology

Acoustics and Audio Technology, Third Edition, is an introductory text for students of sound and vibration as well as electrical and electronic engineering, civil and mechanical engineering, computer science, signals and systems, and engineering physics. A fundamental knowledge of basic engineering mathematics and physics is assumed. Problems are included at the end of the chapters and a solutions manual is available to instructors. This completely revised and expanded classroom-tested third edition covers the physical background to and mathematical treatment of: sound propagation, the properties of human hearing, the generation and radiation of sound as well as architectural acoustics, the technologies used for pickup, recording, and reproduction of sound in various environments, and much more

Acoustics of Voice and Music in Jewish Worship Spaces

The history of Jewish worship space, the organization, and some of the customs of Jewish worship are discussed. Thevarious strands of Jewish worship are presented as they relate to the worship space and its acoustics. The architectural andacoustic features of the various types of Jewish worship spaces and how these relate to the tradition are then presented.The difficulties and possibilities in using sound reinforcement in Jewish worship spaces are noted. Finally, the noiseissues are discussed from the viewpoint of signal-to-noise ratios for speech intelligibility. The intent is to provide a backgroundfor thorough acoustical analysis

Acoustics of Voice and Music in Jewish Worship Spaces

The history of Jewish worship space, the organization, and some of the customs of Jewish worship are discussed. Thevarious strands of Jewish worship are presented as they relate to the worship space and its acoustics. The architectural andacoustic features of the various types of Jewish worship spaces and how these relate to the tradition are then presented.The difficulties and possibilities in using sound reinforcement in Jewish worship spaces are noted. Finally, the noiseissues are discussed from the viewpoint of signal-to-noise ratios for speech intelligibility. The intent is to provide a backgroundfor thorough acoustical analysis

Worship Space Acoustics

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 I discusses methods and techniques of room optimization, including how the acoustics of large and small spaces are designed, implemented, and adjusted; how acoustical privacy is attained; noise and its control; sound reinforcement; and numerical and physical modeling techniques. Part II 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 churches, mosques, and synagogues