...Acoustics From Wikipedia, the free encyclopedia (Redirected from Acoustical) Jump to: navigation, search For other uses, see Acoustics (disambiguation). Artificial omni-directional sound source in an anechoic chamber Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, 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 acoustics technology may be called an acoustical engineer. The application of acoustics is present in almost all aspects of modern society with the most obvious being the audio and noise control industries. Hearing is one of the most crucial means of survival in the animal world, and speech is one of the most distinctive characteristics of human development and culture. Accordingly, the science of acoustics spreads across many facets of human society—music, medicine, architecture, industrial production, warfare and more. Art, craft, science and technology have provoked one another to advance the whole, as in many other fields of knowledge. Robert Bruce Lindsay's 'Wheel of Acoustics' is a well accepted overview of the various fields in acoustics.[1] The word "acoustic" is derived from the Greek word ακουστικός (akoustikos), meaning "of or for hearing, ready to hear"[2] and that from ἀκουστός (akoustos), "heard, audible",[3] which in turn derives from the verb ἀκούω (akouo), "I...
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...ii Cisco TelePresence Fundamentals Cisco TelePresence Fundamentals Tim Szigeti, Kevin McMenamy, Roland Saville, Alan Glowacki Copyright©2009 Cisco Systems, Inc. Published by: Cisco Press 800 East 96th Street Indianapolis, IN 46240 USA All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without written permission from the publisher, except for the inclusion of brief quotations in a review. Printed in the United States of America First Printing May 2009 Library of Congress Cataloging-in-Publication Data Cisco TelePresence fundamentals / Tim Szigeti ... [et al.]. p. cm. ISBN-13: 978-1-58705-593-5 (pbk.) ISBN-10: 1-58705-593-7 (pbk.) 1. Multimedia communications. 2. Computer conferencing. I. Szigeti, Tim. II. Title. [DNLM: 1. Cisco Systems, Inc. ] TK5105.15.C57 2009 006.7--dc22 2009013062 ISBN-13: 978-1-58705-593-5 ISBN-10: 1-58705-593-7 Warning and Disclaimer This book is designed to provide information about Cisco TelePresence. Every effort has been made to make this book as complete and as accurate as possible, but no warranty or fitness is implied. The information is provided on an “as is” basis. The authors, Cisco Press, and Cisco Systems, Inc. shall have neither liability nor responsibility to any person or entity with respect to any loss or damages arising from the information contained in this book or...
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...Challenges for Efficient Communication in Underwater Acoustic Sensor Networks Ian F. Akyildiz, Dario Pompili, Tommaso Melodia Broadband & Wireless Networking Laboratory School of Electrical & Computer Engineering Georgia Institute of Technology, Atlanta, GA 30332 Tel: (404) 894-5141 Fax: (404) 894-7883 e-mail:{ian, dario, tommaso}@ece.gatech.edu Abstract— Ocean bottom sensor nodes can be used for oceanographic data collection, pollution monitoring, offshore exploration and tactical surveillance applications. Moreover, Unmanned or Autonomous Underwater Vehicles (UUVs, AUVs), equipped with sensors, will find application in exploration of natural undersea resources and gathering of scientific data in collaborative monitoring missions. Underwater acoustic networking is the enabling technology for these applications. Underwater Networks consist of a variable number of sensors and vehicles that are deployed to perform collaborative monitoring tasks over a given area. In this paper, several fundamental key aspects of underwater acoustic communications are investigated. Different architectures for two-dimensional and three-dimensional underwater sensor networks are discussed, and the underwater channel is characterized. The main challenges for the development of efficient networking solutions posed by the underwater environment are detailed at all layers of the protocol stack. Furthermore, open research issues are discussed and possible solution approaches are outlined...
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...SCHOOL OF AUDIO ENGINEERING Diploma in Audio Engineering RA 101: INTRODUCTION TO STUDIO STUDIES RA 101.1: INTRODUCTION TO AUDIO RT 101.1 INTRODCUTION TO AUDIO Identifying the Characteristics of Sound Sound and music are parts of our everyday sensory experience. Just as humans have eyes for the detection of light and color, so we are equipped with ears for the detection of sound. We seldom take the time to ponder the characteristics and behaviors of sound and the mechanisms by which sounds are produced, propagated, and detected. The basis for the understanding of sound, music and hearing is the physics of waves. Sound is a wave which is created by vibrating objects and propagated through a medium from one location to another. In this subject, we will investigate the nature, properties and behaviors of sound waves and apply basic wave principles towards an understanding of music. The Elements of Communication Communication: transfer of information from a source or stimulus through a medium to a reception point. The medium through which the information travels can be air, water, space or solid objects. Information that is carried through all natural media takes the form of waves - repeating patterns that oscillate back and forth. E.g. light, sound, electricity radio and TV waves. Stimulus: A medium must be stimulated in order for waves of information to be generated in it. A stimulus produces energy, which radiates outwards from the source in all directions. The sun...
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...Schemes . 2.3.1 Tape Noise . 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 1 2 2 3 Theater Construction 3.1 Room Sizing and Materials . . 3.2 Seating . . . . . . . . . . . . . 3.3 Large Theater . . . . . . . . . . 3.4 Small Screening Room Theater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 5 5 6 . . . . . 7 7 7 7 9 9 . . . . . . . . . . . . . . . . . . . . 4 Sound Equipment 4.1 Terminology . . . . . . . . . . . 4.2 Dolby . . . . . . . . . . . . . . 4.2.1 Noise Reduction Theory 4.2.2 Analog . . . . . . . . . . 4.2.3 Digital . . . . . . . . . . . . . . . ii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . “You ain’t heard nothing yet” Al Jolson 1 Introduction The movie theater is a creation of the 20th century. While both pictures and reproduced sound existed earlier, their joining didn’t occur until the 1920’s. The movie theater requires syncronization between the eyes and ears of the producer to the projectionist. The technology required to create and show a movie is vast; optics, acoustics, mechanics, psychology...
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...Physics of sound Sound is a mechanical wave, sequence of waves is resulting from an air pressure disturbance produced by vibration, and sound propagates through the medium such as air or water. During the propagation, sound can be reflected or attenuated by the medium. Humans can hear the sound is because the vibration pass the wave in to our ear, this is called Traveling Longitudinal Waves. The propagation of the sound can be affected by the density and pressure. The temperature determines the speed of sound with in the medium, also the medium itself would affect the propagation such as wind (moving medium) if the medium is moving therefore the wave would propagated further; with the medium don’t have viscosity, sound would be easier to propagate, but if the medium have an negative viscosity such as water the it would affects the motion of the sound wave. On the top is the diagram of the travellingwave the bar above the diagram represent the concentrations of the pressures on the wave, when the curve are compression (the part above the horizontal line) it represent a high pressure; when the curve are rarefaction (the part below the horizontal line) it represent a low pressure and they change from one to another, this pattern repeats indefinitely. Speed of sound = wavelength*Frequency Wavelength (it can be written as λ) is the distance between two consecutive corresponding points of a waveform. Normally the wavelength is about a meter long. The pitch/frequency of the...
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...career in music. Upon entering Harvard University, he had a fundamental knowledge of music theory after having studied at the Aspen Music School with Darius Milhaud and at the Manhattan School of Music with Fritz Kramer, but ultimately chose to pursue an English literature degree. He spent his post-undergraduate years working in a hospital in Wyoming, where he was fired for unionizing the hospital workers, and as a counselor for teenagers in Vermont. Neil Rolnick had always shown a demonstrated interest in folk and rock music, playing in a rock band through his undergraduate and post-undergraduate years, but when commercial synthesizers first appeared on the market, Rolnick, excited about the possibilities brought on by the new technology at the time, headed to California, where he studied composition first at the San Francisco Conservatory...
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...THIS DOCUMENT IS PROTECTED BY U.S. COPYRIGHT It may not be reproduced, stored in a retrieval system, distributed or transmitted, in whole or in part, in any form or by any means. Downloaded from SAE International by Brunel University, Copyright 2012 SAE International Saturday, January 21, 2012 01:04:43 PM SAE TECHNICAL PAPER SERIES 2008-01-0892 An Optimization of Dual Continuously Variable Valve Timing for Reducing Intake Orifice Noise of a SI Engine Teockhyeong Cho, Youngki Kim, Jaeheon Kim and Koo-tae Kang Hyundai Motor Company Reprinted From: Noise and Vibration, 2008 (SP-2158) 2008 World Congress Detroit, Michigan April 14-17, 2008 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org THIS DOCUMENT IS PROTECTED BY U.S. COPYRIGHT It may not be reproduced, stored in a retrieval system, distributed or transmitted, in whole or in part, in any form or by any means. Downloaded from SAE International by Brunel University, Copyright 2012 SAE International Saturday, January 21, 2012 01:04:43 PM By mandate of the Engineering Meetings Board, this paper has been approved for SAE publication upon completion of a peer review process by a minimum of three (3) industry experts under the supervision of the session organizer. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording...
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...RSA Key Extraction via Low-Bandwidth Acoustic Cryptanalysis∗ Daniel Genkin Technion and Tel Aviv University danielg3@cs.technion.ac.il Adi Shamir Weizmann Institute of Science adi.shamir@weizmann.ac.il Eran Tromer Tel Aviv University tromer@cs.tau.ac.il December 18, 2013 Abstract Many computers emit a high-pitched noise during operation, due to vibration in some of their electronic components. These acoustic emanations are more than a nuisance: they can convey information about the software running on the computer, and in particular leak sensitive information about security-related computations. In a preliminary presentation (Eurocrypt’04 rump session), we have shown that different RSA keys induce different sound patterns, but it was not clear how to extract individual key bits. The main problem was that the acoustic side channel has a very low bandwidth (under 20 kHz using common microphones, and a few hundred kHz using ultrasound microphones), many orders of magnitude below the GHz-scale clock rates of the attacked computers. In this paper we describe a new acoustic cryptanalysis key extraction attack, applicable to GnuPG’s current implementation of RSA. The attack can extract full 4096-bit RSA decryption keys from laptop computers (of various models), within an hour, using the sound generated by the computer during the decryption of some chosen ciphertexts. We experimentally demonstrate that such attacks can be carried out, using either a plain mobile phone placed...
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...stations called sensor nodes, each of which is small, lightweight and portable. Every sensor node is equipped with a transducer, microcomputer, transceiver and power source. The transducer generates electrical signals based on sensed physical effects and phenomena. The microcomputer processes and stores the sensor output. The transceiver, which can be hard-wired or wireless, receives commands from a central computer and transmits data to that computer. The power for each sensor node is derived from the electric utility or from a battery. Sensors use a signal of some sort, from the environment and convert it to readable form for purpose of information transfer. Each sensor node has multiple modalities for sensing the environment such as acoustic, seismic, light, temperature, etc. However, each sensor can sense only one modality at a time. The sensor nodes in the target tracking WSN use collaboration with the neighboring nodes. This requires data exchange between sensor nodes over an ad hoc wireless network with no central coordination medium. There are various phenomena in our environment to be sensed by the sensor nodes. Examples include enemy detection and tracking for military purpose, machine monitoring and inventory control system, remote sensing and environmental monitoring. The sensors are typically battery- powered and have limited wireless communication bandwidth. Therefore, energy efficient target tracking systems are needed...
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...1 A DSP A-Z http://www.unex.ucla.edu Digital Signal Processing An “A” to “Z” R.W. Stewart Signal Processing Division Dept. of Electronic and Electrical Eng. University of Strathclyde Glasgow G1 1XW, UK Tel: +44 (0) 141 548 2396 Fax: +44 (0) 141 552 2487 E-mail: r.stewart@eee.strath.ac.uk M.W. Hoffman Department of Electrical Eng. 209N Walter Scott Eng. Center PO Box 880511 Lincoln, NE 68588 0511 USA Tel: +1 402 472 1979 Fax: +1 402 472 4732 Email:hoffman@unlinfo.unl.edu © BlueBox Multimedia, R.W. Stewart 1998 2 The DSPedia DSPedia An A-Z of Digital Signal Processing This text aims to present relevant, accurate and readable definitions of common and not so common terms, algorithms, techniques and information related to DSP technology and applications. It is hoped that the information presented will complement the formal teachings of the many excellent DSP textbooks available and bridge the gaps that often exist between advanced DSP texts and introductory DSP. While some of the entries are particularly detailed, most often in cases where the concept, application or term is particularly important in DSP, you will find that other terms are short, and perhaps even dismissive when it is considered that the term is not directly relevant to DSP or would not benefit from an extensive description. There are 4 key sections to the text: • • • • DSP terms A-Z Common Numbers associated with DSP Acronyms References page 1 page 427 page 435 page 443 the...
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...being to communicate with each other. This paper demonstrate the analyzation of gender by the speech and present the certain emotions impact on fundamental pitch range. It differs from gender to gender. In Future speech will be major part to communicate with machine. Now a days as a learner we try to communicate machine with soft voice. This paper take a challenge accepting voice sample with different mood or emotion and detect a specific gender depending on the frequency of the gender. Keyword— Emotion; Gender; Pitch; Speech Processing. 1. Introduction The communication is nothing but exchanging the information between two or more people. The speech is basic part of communication, by speech one...
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...Alex Espinosa Dr. Wilson MCWP 125 2/8/16 Why Naval Sonar Use Should Be More Highly Regulated Over recent years, military- derived sonar has been found to be linked with cetacean strandings. This and the general increase of noise in the ocean within the last century, which is known to have increased with the introduction of propeller ship engines (Jasny 12), has largely impacted the oceanic ecosystem. If such strong correlations have been scientifically determined, why has the United States Navy failed to adjust its practices in favor of saving marine organisms? How much evidence will suffice for the United States government to take necessary strides towards keeping our oceans safe? It is with this in mind that I claim that the U.S. Navy’s use of active sonar, whether it be mid or low frequency, needs to be more highly regulated. Therefore, government officials need to use their political power to support the marine species being affected by these anthropogenic noises. My first sub claim supporting my driving thesis will pertain to the negative impact sonar activity has on marine organisms. I will begin with the introduction of the importance of sound to the ocean’s mammals, the most prominent subjects of mid and low frequency sonar. This is an imperative aspect of this issue because the survival of every single one of these marine animals is based concretely in their specialized abilities to hear through the oceanic medium. With this I will present the scientifically supported...
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...Biological 5. Psychosocial Above mentioned hazards as well as all other health hazards are disastrous due to their adverse effects on exposed people like Bodily injury, Disease, Change in the way the body functions, grows, or develops, Effects on a developing fetus (teratogenic effects, fetotoxic effects), Effects on children, grandchildren, etc. (inheritable genetic effects) Decrease in life span, Change in mental condition resulting from stress, traumatic experiences, exposure to solvents. Effects on the ability to accommodate additional stress Following are some processes that can be hazardous for the health of workers 1. Abrasive blasting; abrasive blasting operations can create high levels of dust and noise. Abrasive material and the surface being blasted may contain toxic materials (e.g., lead paint, silica) that are hazardous to workers. Silica sand (crystalline) can cause silicosis, lung cancer, and breathing problems in exposed workers. Coal slag and garnet sand may cause lung damage similar to silica sand (based on preliminary animal testing). Copper slag, nickel slag, and glass (crushed or beads) also have the potential to cause lung damage. Steel grit and shot have less potential to cause lung...
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...The Art of Digital Audio Recording The Art of Digital Audio Recording A Practical Guide for Home and Studio Steve Savage With photos by Robert Johnson and diagrams by Iain Fergusson 3 3 Oxford University Press, Inc., publishes works that further Oxford University’s objective of excellence in research, scholarship, and education. Oxford New York Auckland Cape Town Dar es Salaam Hong Kong Karachi Kuala Lumpur Madrid Melbourne Mexico City Nairobi New Delhi Shanghai Taipei Toronto With offices in Argentina Austria Brazil Chile Czech Republic France Greece Guatemala Hungary Italy Japan Poland Portugal Singapore South Korea Switzerland Thailand Turkey Ukraine Vietnam Copyright © 2011 by Steve Savage Published by Oxford University Press, Inc. 198 Madison Avenue, New York, New York 10016 www.oup.com Oxford is a registered trademark of Oxford University Press. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of Oxford University Press. Library of Congress Cataloging-in-Publication Data Savage, Steve. The art of digital audio recording: a practical guide for home and studio / Steve Savage; with photos by Robert Johnson and diagrams by Iain Fergusson. p. cm. Includes bibliographical references and index. ISBN 978-0-19-539409-2; 978-0-19-539410-8 (pbk.) 1. Sound studios. 2. Sound—Recording...
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