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electroacoustics This branch of acoustic engineering deals with the design of headphones, microphones, loudspeakers, sound systems, sound reproduction, and recording.[15] There has been a rapid increase in the use of portable electronic devices which can reproduce sound and rely on electroacoustic engineering, e.g. mobile phones, portable media players, and tablet computers. This term is also used for a set of electrokinetic effects that occur in heterogeneous liquids under influence of ultrasound. There is International Standard that describes such electroacoustic effects in details
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.[1] Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in). Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges. Acoustics is the interdisciplinary science that deals with the study of mechanical waves in gasses, liquids, and solids including vibration, sound, ultrasound, and infrasound. A scientist who works in the field of acoustics is an acoustician, while someone working in the field of acoustical engineering may be called an acoustical engineer.[2] An audio engineer, on the other hand, is concerned with the recording, manipulation, mixing, and reproduction of sound. Applications of acoustics are found in almost all aspects of modern society, subdisciplines include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics, electro-acoustics, environmental noise, musical acoustics, noise control, psychoacoustics, speech, ultrasound, underwater acoustics, and vibration.
This Standard specifies the technical requirements, measuring methods, inspection rules, marking, packaging, transportation and storage for hearing aids. This Standard applies to air- and bone-conduct hearing aids.
This book brings the neurosciences to operational and clinical aviation medicine. It is concerned with the physiology and pathology of circadian rhythmicity, orientation, hypotension and hypoxia, and with disorders of the central nervous system relevant to the practice of aviation medicine. The chapters on circadian rhythmicity and orientation deal with the impaired alertness and sleep disturbance associated with desynchrony and with the effects of linear and angular accelerations on spatial awareness. Hypotension and hypoxia cover cerebral function during increased gravitational stress, clinical aspects of exposure to acute hypoxia, the mild hypoxia of the cabin of transport aircraft, adaptation and acclimatization to altitude and decompression at extreme altitudes and in space. Disorders of particular significance to the practice of aviation medicine such as excessive daytime sleepiness, epilepsy, syncope, hypoglycaemia, headache and traumatic brain injury are covered, while neuro-ophthalmology, the vestibular system and hearing also receive detailed attention. The potentially adverse effects of the aviation environment and of disorders of the nervous system are brought together, and the text covers the neurological examination as it relates to aircrew and explores current management and therapeutics. The Neurosciences and the Practice of Aviation Medicine is an essential work for those involved in the practice of aviation medicine where familiarity with the effects of the aviation environment on the nervous system and understanding the pathophysiology of relevant clinical disorders are of prime concern. The authors from leading centres of excellence are physiologists concerned with the aviation environment and physicians involved in the day-to-day practice of medicine. They bring to this authoritative text wide experience and expertise in both the experimental and clinical neurosciences.
The Oxford Handbook of Computer Music offers a state-of-the-art cross-section of the most field-defining topics and debates in computer music today. A unique contribution to the field, it situates computer music in the broad context of its creation and performance across the range of issues - from music cognition to pedagogy to sociocultural topics - that shape contemporary discourse in the field. Fifty years after musical tones were produced on a computer for the first time, developments in laptop computing have brought computer music within reach of all listeners and composers. Production and distribution of computer music have grown tremendously as a result, and the time is right for this survey of computer music in its cultural contexts. An impressive and international array of music creators and academics discuss computer music's history, present, and future with a wide perspective, including composition, improvisation, interactive performance, spatialization, sound synthesis, sonification, and modeling. Throughout, they merge practice with theory to offer a fascinating look into computer music's possibilities and enduring appeal.
Electroacoustic music is now in the mainstream of music, pervading all styles from the avant-garde to pop. Even classical works are routinely scored on a computer and a synthesized demo is a powerful tool for previewing a piece. The fundamental skills of electroacoustic composition are now as essential to a music student as ear training and counterpoint. The Art and Technique of Electroacoustic Music provides a detailed approach those fundamental skills. In this book Peter Elsea explores the topic from the fundamentals of acoustics through the basics of recording, composition with the tools of music concreté, and music production with MIDI instruments, softsynths and digital audio Workstations. Later sections of the book cover synthesis in depth and introduce high powered computer composition languages including Csound, ChucK, and Max/MSP. A final section presents the challenges and techniques of live performance. This book can be used as a text for undergraduate courses and also as a guide for self-learning.
Get the leading guide to acoustics for architects, engineers, and interior designers. A widely recognized, comprehensive reference to acoustic principles for all concerned with the built environment, Architectural Acoustics, Second Edition provides design professionals with up-to-date information on basic concepts, acoustical materials, and technologies for controlling wanted or unwanted sound within and around buildings. Written by a team of internationally recognized experts and experienced consultants, this Second Edition covers fundamental acoustic principles, design criteria, acoustical materials, control strategies, and methods for a wide variety of building types, including educational, healthcare, recreational, residential, commercial, industrial, and transportation facilities. Particular attention is given to places for listening and performance such as theaters, churches, concert and recital halls, outdoor arenas, classrooms, multiuse auditoria, libraries, music practice and rehearsal rooms, recording and broadcast studios, sports venues, home theaters, and other spaces that people meet to communicate and enjoy performance. Updated throughout, this edition features: New information on acoustical standards and guidelines for sustainable building design. Additional, richly detailed case studies demonstrating real-world applications, including the acclaimed Walt Disney Concert Hall and many other building types. Nearly 200 photos and illustrations that further elucidate specific principles, applications, and techniques. New developments in sound reinforcement and audio visual systems and their integration in room design. Progress in research and future directions in acoustical modeling. With fundamental conceptual understanding of basic acoustical principles provided by Architectural Acoustics, Second Edition, building designers can confidently create aesthetically and aurally pleasing spaces, while avoiding problems that could be very costly, if not impossible, to solve later.
This classic and authoritative student textbook contains information that is not over simplified and can be used to solve the real world problems encountered by noise and vibration consultants as well as the more straightforward ones handled by engineers and occupational hygienists in industry. The book covers the fundamentals of acoustics, theoretical concepts and practical application of current noise control technology. It aims to be as comprehensive as possible while still covering important concepts in sufficient detail to engender a deep understanding of the foundations upon which noise control technology is built. Topics which are extensively developed or overhauled from the fourth edition include sound propagation outdoors, amplitude modulation, hearing protection, frequency analysis, muffling devices (including 4-pole analysis and self noise), sound transmission through partitions, finite element analysis, statistical energy analysis and transportation noise. For those who are already well versed in the art and science of noise control, the book will provide an extremely useful reference. A wide range of example problems that are linked to noise control practice are available on www.causalsystems.com for free download.
This book explores environmental physical agents and their potential effect on public and occupational health. It considers the theory, current research, and applications of physical agents including noise, ionizing radiation protection and non ionizing radiation protection, and explores the monitoring, measurement, modeling and mitigation of each of these. Features: Covers all three physical agents in one comprehensive book Presents the latest results from research, as well as theory Contributed to by a panel of international experts