21. The U Of U Active Noise Control Web Page Welcome! This web page is a compendium of information about ongoing research in active noise control at the University of Utah. http://www.elen.utah.edu/~douglas/anc-index.html

Welcome! This web page is a compendium of information about on-going research in active noise control at the University of Utah. Included are course descriptions, research projects, and biographies of faculty and students. Note: This page is currently under construction ; so some links may not be supported yet. Expect some major changes to this page during March and April. Research Projects Faculty working in ANC Students working in ANC Publications ... El En 620: Active Noise and Vibration Control Questions? Contact Prof. Douglas at douglas@ee.utah.edu.

22. Research Projects In Active Noise Control Through this page, you can access information about past and current research projects in active noise control at the University of Utah. http://www.elen.utah.edu/~douglas/anc-research.html

Through this page, you can access information about past and current research projects in active noise control at the University of Utah. Research Project: The Fast Affine Projection Algorithm for Multichannel Active Noise Control Faculty Advisor: Scott C. Douglas Graduate Student: Jihee K. Soh Research Project: Implementing Active Noise Control Systems on General-Purpose Microprocessors Faculty Advisor: Scott C. Douglas Graduate Student: Jason Barkdull Research Projects: Advanced Algorithms for Multichannel Active Noise Control Faculty Advisors: Scott C. Douglas and Marc Bodson Graduate Students: (to be determined) Research Project: Dynamical Simulation Tools for Multichannel Active Noise Control Faculty Advisor: Scott C. Douglas Graduate Student: (to be determined) EE 542 Class Project: VLSI Design of a Single Channel Active Noise Control System. Faculty Advisors: Scott C. Douglas and Kent F. Smith EE490 Senior Project: Development of a Multichannel Active Noise Control System Using the Motorola DSP96002. Faculty Advisors: Scott C. Douglas

23. Active Noise Control - Encyclopedia Article About Active Noise Control. Free Acc encyclopedia article about active noise control. active noise control in Free online English dictionary, thesaurus and encyclopedia. active noise control. http://encyclopedia.thefreedictionary.com/Active noise control

Dictionaries: General Computing Medical Legal Encyclopedia Active noise control Word: Word Starts with Ends with Definition Active noise control (also known as antinoise ) is a method for preventing unwanted sound This article is about compression waves. You may be looking for the geographical term, sound, a large ocean inlet, or a narrow ocean channel between two bodies of land, or a urethral sound, is a medical instrument used for dilating the urethra. Sound is defined as mechanical compression or longitudinal displacement waves that propagate through a medium (solid, liquid or Click the link for more information. . Sound consists of vibrations Oscillation is the periodic variation, typically in time, of some measure as seen, for example, in a swinging pendulum. The term vibration is sometimes used more narrowly to mean a mechanical oscillation but sometimes is used to be synonymous with oscillation . Oscillations occur not only in physical systems but also in biological systems and in human society. Oscillations are the origin of the sensation of musical tone. Click the link for more information.

24. TNO TPD - Active Noise Control In Aircraft throughout a flight. System Features. Noise control by destructive interference; Inhouse built controller; sample frequency 1 kHz. http://www.tpd.tno.nl/smartsite531.html

More information Home Corporate Search Sitemap ... Projects Active noise control in aircraft TNO TPD has developed technology to achieve a substantial reduction of the noise level in the entire cabin of an aircraft throughout a flight. System Features Noise control by destructive interference In-house built controller; sample frequency 1 kHz. 48 microphones and 32 loudspeakers or smart piezo panels Click here to hear the difference (control off - control on) Active vibration control Control Engineering TNO TPD Communications Department Stieltjesweg 1 2628 CK Delft P.O. Box 155 2600 AD Delft The Netherlands Phone Fax E-mail info@tpd.tno.nl

25. NVHmaterials.com - Links Database © Copyright 2002 NVHmaterials.com All rights Reserved. Top active noise control. NVHmaterials.com Links Database active noise control. http://www.nvhmaterials.com/nvh/Active_Noise_Control/

home about us search tips contact ... email Check out the new NVHmaterials.com discussion board and forums The site has recently undergone a complete overhaul. Please contact Paul Sakion with any comments or changes NVHmaterials.com Top : Active Noise Control NVHmaterials.com - Links Database: Active Noise Control Home Add a Resource Modify a Resource What's New ... Search Links: Active Noise Control FAQ - FAQ's, references, and links to other sites involved with active noise control pop (Added: 11-Jun-2000 Hits: 696 Rating: Votes: 0) Rate It Signal Systems Corporation - We specialize in signal processing, noise reduction and active noise control pop (Added: 1-Sep-2002 Hits: 457 Rating: 2.00 Votes: 1) Rate It pop (Added: 8-Jun-2000 Hits: 580 Rating: 9.00 Votes: 1) Rate It Active Control AB - Acticut, a high-tech solution for controlling vibrations in turning and other metal-cutting applications (Added: 11-Jun-2000 Hits: 211 Rating: Votes: 0) Rate It Active Vibration Control - Active damping solutions (Added: 9-Jun-2003 Hits: 118 Rating: Votes: 0) Rate It Active Vibration Isolation from HWL Scientific Instruments GmbH - Next Generation of active vibration isolation, high-end anti vibration solutions for highest resolution microscopy and measurement. frequency: 0,7 Hz - 1000 Hz max. load: up to 150 kg

26. Campanella Associates (Acoustics Consultants) - Active Noise Control Click Here to Return to Home Page active noise control or Cancellation (ANC). Otherwise, perform a new web search on the subject active noise control . http://www.campanellaacoustics.com/anc.htm

Active Noise Control or Cancellation (ANC) Many folks called us recently asking about the application of ANC to domestic and commercial noise control problems. The conventional wisdom seems to be that any noise situation is amenable to an ANC solution. This is false, just as is the notion that a computer is the solution to all of your calculation and bookkeeping problems or that computers reduce the consumption of paper. Consider that most general noise problems are 3-dimensional in nature, typically a noisy area where one or more persons move about. Some explanation is in order: ANC uses the principle of destructive interference where the noise sound wave is sensed with a microphone. This signal is amplified and fed to a loudspeaker which emits it precisely 180 degrees out of phase with the original wave. Cancellation is created at that point. In one-dimensional propagation as down a duct, the sound wave for all intents is "stopped" at that point since the sound from the loudspeaker also proceeds one-dimensionally down the duct, matching the original noise waves precisely along the way. In the case of two or three dimensional propagation into space or into a room, The noise may have been produced a distance away. The divergence of the loudspeaker sound does not match the pattern of the divergence of the noise field, so cancellation does not occur. It requires that the loudspeaker be precisely placed at the center of the source of noise, usually an impossible task.

27. Active Noise Control active noise control. active noise control (also known as antinoise) is a method for preventing unwanted sound. Sound consists of http://www.fact-index.com/a/ac/active_noise_control.html

Main Page See live article Alphabetical index Active noise control Active noise control (also known as antinoise ) is a method for preventing unwanted sound . Sound consists of vibrations in the air , which can be represented as a wave . If a speaker emits a sound whose wave is the exact opposite phase to the original sound, the waves cancel out and the result is no sound at all. A computer analyses the waveform of the background aural or nonaural noise interference . This waveform is identical or directly proportional to the waveform of the noise, except for its opposing amplitude This method differs from passive noise control methods ( sound proofing ) in that a powered system is involved, rather than unpowered methods such as insulation , sound-absorbing ceiling tiles or automobile mufflers. Practical implementation is complex, due to the way that sound waves can interact, particularly at high frequencies or in geometrically complex areas. They are most easily used with simple, low-frequency sounds, such as the sound of air moving through a duct. Antinoise systems have seen some use for quiet headphones and for reducing engine noise in vehicles.

28. Publications On Active Noise And Vibration Control -- Scott C. Douglas active noise control, and its cousin, active vibration control, attempt to cancel an unwanted ``noise acoustical wave by injecting an equalbut-opposite http://engr.smu.edu/~douglas/pubanvc.html

Active Noise and Vibration Control (ANVC) Active noise control, and its cousin, active vibration control, attempt to cancel an unwanted ``noise'' acoustical wave by injecting an equal-but-opposite ``anti-noise''acoustical wave into the medium, thereby attenuating the wave via destructive interference. The origins of ANVC date back to at least 1936, when P. Leug patented the idea for sound control. It tooks nearly fifty years, however, to obtain what might be called successful ANVC, due to the level of electronic precision required to create an anti-noise signal with any great fidelity. Today, anti-noise headsets abound (I have a very cute set of Sony earbud-style `phones from Japan); these are mostly analog systems. Large-scale quieting requires the use of adaptive digital signal processing technology in all but the simplest acoustic environments. I began my study of ANVC as a summer hire at SRI International, Menlo Park, CA, in 1992. While working in the Acoustics and Radar Technology Laboratory, I helped develop the algorithms and guide software code developers to implement a simple one-input, one-output, one-error active noise control system that illustrated some of the advantages that simple adaptive processing has over more-costly off-line calibration methods. I also developed the multichannel extensions of the algorithms and wrote an internal SRI report that helped others to design a real-time multichannel active noise control system for reverberant room noise control. After joining the University of Utah, I remained as a consultant to SRI, developing normalized LMS algorithms for multichannel active noise control and studying simplified

29. Wiley::Active Noise Control Systems: Algorithms And DSP Implementations Electronics Engineering Communication Technology General Communication Technology active noise control Systems Algorithms and DSP Implementations. http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471134244.html

Shopping Cart My Account Help Contact Us By Keyword By Title By Author By ISBN By ISSN Wiley Engineering Communication Technology General Communication Technology Active Noise Control Systems: Algorithms and DSP Implementations Related Subjects General Networking Networks Satellite Communications Related Titles More By These Authors Real-Time Digital Signal Processing: Implementations, Application and Experiments with the TMS320C55X , Students Solutions Manual (Paperback) General Communication Technology Automatic Control Systems, 8th Edition (Hardcover) by Benjamin C. Kuo, Farid Golnaraghi Understanding Telecommunications and Lightwave Systems: An Entry-Level Guide, 3rd Edition (Paperback) by John G. Nellist Voice Compression and Communications: Principles and Applications for Fixed and Wireless Channels (Hardcover) by Lajos Hanzo, F. Clare A. Somerville, Jason P. Woodward Wireless Communications in the 21st Century (Hardcover) by Mansoor Shafi (Editor), Shigeaki Ogose (Editor), Takeshi Hattori (Editor) An Introduction to Digital Communications (Hardcover) by Jack Kurzweil Join an Engineering Mailing List General Communication Technology Active Noise Control Systems: Algorithms and DSP Implementations Sen M. Kuo, Dennis R. Morgan

30. Elliott Aviation - Sound Management System HOW active noise control WORKS The Principle active noise control technology Frequencies (BPF). active noise control Implementation This photograph http://www.elliottaviation.com/sms/smshowanc.asp

Articles Testimonials Active Noise Control Development HOW ACTIVE NOISE CONTROL WORKS The Principle Active Noise Control technology was discovered in the 1930's, and for many years scientists attempted to implement the physical theory. However, it was not until the advent of microprocessors and faster computing capacity that commercial applications for a wide variety of industries and products became viable. For example, in the automotive arena, electronic mufflers, engine mounts and cabin quieting systems are being developed to quiet motor vehicles. SMS Demo requires Flash 4 or higher! The basic principle of Active Noise Control is that an additional source of sound or vibration is introduced to provide an anti-phase image of the unwanted disturbance. If one sound wave is the negative of the other (that is, the high pressure region of one matches the low pressure region of the other, and vice versa), then the result will be constant pressure, or silence. In the case of Active Noise Control (ANC), the level of unwanted noise is reduced or canceled by using loudspeakers to generate anti-noise, or the mirror image of the unwanted noise, in the area where noise reduction is required. The canceling sound signal has to equal in frequency and amplitude, but exactly opposite in phase. Current Active Noise Control systems rely on having the ability to anticipate or predict the characteristics of the noise; in other words, the noise has to be periodic or tonal in nature, such as that generated by turbine blades. At the current level of technology, it is not possible to cancel random or broadband noise caused by airflow outside the aircraft. In any event, as far as passenger aircraft are concerned, it is probably not desirable to create an unduly quiet environment, in which conversations can be overheard. Nor is it desirable that the cancellation signal should interfere with or suppress human speech.

31. Active Noise Control Products On GlobalSpec Find active noise control Products on GlobalSpec by specifications. active noise control Products. 46 companies make active noise control Products. http://sensors-transducers.globalspec.com/SpecSearch/Suppliers/Mechanical_Compon

Limit your search to: Find: Service Providers A Company by Name == THE ENGINEERING WEB == All Sites Application Notes Material Properties Patents Standards Supplier Web Sites You are here: GlobalSpec.com Sensors, Transducers and Detectors Acoustic and Audio Equipment Active Noise Control Products Free Registration Active Noise Control Products 46 companies make Active Noise Control Products. Click on a listing for more information. Company Headquarters Online Quote ... MISUMI Of The Americas, Inc. Schaumburg, IL PCB Piezotronics, Inc. Depew, NY Accusonic Products Bay Shore, NY Acoustical Panel Systems Fredericksburg, VA Acoustical Surfaces, Inc. Chaska, MN AirLoc Franklin, MA American Acoustical Products Holliston, MA Amorim Industrial Solutions, Inc. Trevor, WI Andrea Electronics Corporation Melville, NY Apex Molded Products Co., Inc. Philadelphia, PA AVT, Inc. Bridgeville, PA Best Foam Fabricators, Inc. Chicago, IL Crossfire Engineering, Inc. Broad Brook, CT CSA Engineering, Inc. Mountain View, CA Dodge-Regupol, Inc. Lancaster, PA Energy Kinetics, Inc.

32. WIT Press Active Noise Control... 1853123730 active noise control Fundamentals for Acoustic Design G. ROSENHOUSE, Israel Institute of Technology, Israel ISBN 185312-373-0 Published 2001 Pages 424pp http://www.witpress.com/acatalog/3730.html

Online Catalogue Acoustics G. ROSENHOUSE, Israel Institute of Technology, Israel ISBN: Published: Pages: Hardback "...a valuable addition." APPLIED MECHANICS REVIEWS View Contents: Price: EuroConverter(175.00); 10% Discount Price: Whitelight Studio Privacy Policy Terms and Conditions

33. WIT Press Active Noise Control Volume 2... 1853125687 active noise control Information and Control Systems in Engineering and Nature G. ROSENHOUSE, TechnionIsrael Institute of Technology, Haifa, Israel ISBN 1 http://www.witpress.com/acatalog/5687.html

Online Catalogue Acoustics G. ROSENHOUSE, Technion-Israel Institute of Technology, Haifa, Israel ISBN: Published: Pages: Hardback Prices are approx: EuroConverter(175.00); 10% Discount Price: Whitelight Studio Privacy Policy Terms and Conditions

34. Applied Acoustics - Education - Courses - Active Noise Control active noise control. VTA130 It demonstrates the fundamentals of active noise control for the case of plane wave propagation in ducts. Different http://cthta4.ta.chalmers.se/www/webben/edu/courses/anc.html

Welcome Facilities Research Education ... - International Master's programme - Courses - Basic courses - Perception of sound - Noise control - Noise in society - Supplementary courses - Master's thesis - Educational methods - Entry requirements - Further information Course pages People Events Tools ... Home Active Noise Control VTA130 5 credits 0760 Department of Applied Acoustics (Teknisk akustik) Examiner: 9412 Prof. Wolfgang Kropp Course aim The course gives knowledge in the basics of active control of sound and vibrations. It demonstrates the fundamentals of active noise control for the case of plane wave propagation in ducts. Different control algorithm are discussed. The control of three dimensional sound fields as well as the excitation and radiation from structures are part of the course. Contents The course focuses on the following subjects; The process of field cancellation in three dimensions Controller design (Active noise control structures, geometry related constraints) System stability (Stability criterion, spatial conditions) Fixed and adaptive controller Literature Tokhi, M. O. and Leitch, R. R., "Active Noise Control", Oxford Science Publications (1992)

35. NRC-Institute For Aerospace Research: Active Noise Control active noise control. IAR has developed expertise in the field of active noise control. Fullscale experiment on active noise control http://iar-ira.nrc-cnrc.gc.ca/smpl_9a.html

@import "percent.css"; Active Noise Control IAR has developed expertise in the field of active noise control. The areas of activity include the use of reciprocal and direct techniques for the measurement of sound transmission through structures, vibro-acoustic modelling of structures, and active noise control using piezoelectric actuators. Full-scale experiment on active noise control Activities in active noise control are focused on noise reduction in aircraft. Experiments are underway on a full-scale aircraft fuselage to verify computer models developed for predicting both open and closed loop sound pressure levels in an aircraft cabin. In the experiments, control algorithms, including adaptive schemes, are implemented in real time using discrete time compensator models and a PC with an analog I/O data acquisition and control board. The use of piezoelectric actuators allows for a reduction in both acoustic noise and structural vibration. Research and development work with Canadian industry has been ongoing for a number of years in the area of noise transmission and control for turboprop aircraft with such collaborators as de Havilland. Plans are underway for a flight test verification. Active Noise Control Equipment: Zonic 7000 multi-channel data acquisition and analysis system HP 3565S multi-channel data acquisition and analysis system Bruel and Kjaer 2032 analyzer

36. Science Search > Active Noise Control 1. Frequently Asked Questions about active noise control Frequently Asked Questions about active noise control http//users.erols.com/ruckman/ancfaq.htm 17-01 http://www.science-search.org/index/Technology/Acoustics,044_Ultrasound_and_Vibr

Search for: Current Category Everything What's new Top Searches Statistics Science News ... Home Current location: Technology Acoustics, Ultrasound and Vibration > Active Noise Control Frequently Asked Questions about Active Noise Control Frequently Asked Questions about Active Noise Control http://users.erols.com/ruckman/ancfaq.htm detailed information Rating: [6.00] Votes: [1793] Virginia Tech Vibration and Acoustics Lab Research at Virginia Tech. http://www.val.me.vt.edu/ detailed information Rating: [6.00] Votes: [2164] ACTIVE 99 Technical Program Program of the 1999 international conference on active noise and vibration control. http://members.aol.com/noisenewsi/a99_pgm.html detailed information Rating: [5.00] Votes: [62] Active Noise Control for Smart Materials Research results and software tools for using smart materials in active noise control. Active noise control and noise cancellation solutions for ac http://www.signalsystemscorp.com/ancindex.htm detailed information Rating: [5.00] Votes: [474]

37. Active Noise Control For Smart Materials Research results and software tools for using smart materials in active noise control....... Name active noise control for Smart Materials http://www.science-search.org/index/Technology/Acoustics,044_Ultrasound_and_Vibr

Search in Science-Search.org for: What's new Top Searches Statistics Science News ... Home : Detailed Information Name: Active Noise Control for Smart Materials Description: Research results and software tools for using smart materials in active noise control. Active noise control and noise cancellation solutions for ac Category: Active Noise Control Url: http://www.signalsystemscorp.com/ancindex.htm Date: Current Rating: Clicks/Hits Received: Rate this web site: Rating: Votes: Web site owner: Allow people to rate your site on your site Modify your link Something wrong with this resource? Report this link as broken About Us Contact Us Site Guide ... Add Science Search to Your Web Site The Science Search Directory is based on DMOZ. Science Search has modified and enhanced this data. Submitting to DMOZ: Help build the largest human-edited directory on the web. Submit a Site Open Directory Project Become an Editor Science Search's Sponsors: Goom NL

38. Science, Technology, Acoustics, Ultrasound And Vibration: Active Noise Control active noise control is the modification of an unwanted sound by using an electromechanical source to generate another interfering sound. http://www.combose.com/Science/Technology/Acoustics,_Ultrasound_and_Vibration/Ac

Top Science Technology Acoustics, Ultrasound and Vibration ... Active Noise Control Related links of interest: Business:Energy and Environment:Environment:Noise and Vibration Control:Products:Control ACTIVE 99 Technical Program - Program of the 1999 international conference on active noise and vibration control. Active Noise Control for Smart Materials - Research results and software tools for using smart materials in active noise control. Active noise control and noise cancellation solutions for acoustic problems brought to you by Signal Systems Corporation. BoscoItalia S.p.A. (Italy) - company in the sector of the industrial noise, noise reduction systems in all industrial fields: aeronautics, motoring, energy, road building and railways. Frequently Asked Questions about Active Noise Control - Provides answers to common questions about active noise control including a discussion of popular misconceptions about what active noise control can and cannot do. Lord Corporation NVX Active Systems - Products from a manufacturer of active noise and vibration control systems for passenger aircraft. TechnoFirst - Designer and manufacturer of mufflers and headsets with active control of noise and vibrations.

39. House_N Research Template House_n the MIT home of the future. active noise control. The most commercially successful active noise control systems are headsets used in aviation. http://architecture.mit.edu/house_n/web/resources/tutorials/House_N Tutorial Act

n the MIT home of the future Active Noise Control http://www.adit.fr/Produits/TF/Anciens/TF25a.html ). Commercially, ANC has met with success in the avionics industry reducing noise inside the cockpit. ANC is also being currently studied in universities (Pennsylvania State University and Virginia Tech) and government laboratories (NASA Langeley Research Center and NASA Glenn Aeroacoustic Propulsion Laboratory). The current focus is on reducing the noise of aircraft engine noise through ANC inside of aircraft cabins/cockpits. Figure 1: Two waves with equal amplitude and identical phase add together constructively, resulting in a doubling of overall amplitude. Figure 2: Two waves with equal amplitude and opposite phase add together destructively, resulting in a canceling of overall amplitude. The phase describes the relative position of the wave in its rising and falling cycle. If two waves are in phase, they rise and fall together, whilst if they are exactly out of phase, one is rises as the other falls, and so they cancel out. (This effect can be heard in the interactive demo at http://www.isvr.soton.ac.uk/active). A basic noise cancellation setup consists of a physical space in which a microphone/s senses the sound signal. It is then processed (i.e. in a Digital Signal Processor) and the inverse signal is broadcasted through actuators (speakers). The broadcasted waves then interfere with the noise to cancel it out. The most commercially successful active noise control systems are headsets used in aviation. Active Noise Control offers a major advancement in headset technology in that old passive methods insulate the ear directly. However, the voice transmission microphone is outside of the earmuffs (the part around the ear), and therefore picks up the noise and transmits it to inside of the earmuff.

40. Active Noise And Vibration Control We are investigating Active Structural Acoustic Control (ASAC) on the enclosure, and active noise control (ANC) in the enclosed space. http://control.ee.ethz.ch/~anc/

General Info Overview Visitors People Links Research Groups Publications Software Education Courses SA/DA Lab News News Seminars Jobs Search Internal Active Noise and Vibration Control Home People Research News ... Links Noise is more and more perceived as an environmental pollutant. This shift in attitude is reflected in stricter legislation and has wide ranging economic consequences. Traditionally, noise was reduced by passive means like mufflers, damping plates, sound absorbing materials, double-glazing windows, noise barriers etc. All these passive means are mostly suitable for high frequencies and have various disadvantages. In the last decade, active control of sound and vibration (at audio frequencies) has emerged as a viable technology to bridge the low-frequency technology gap. The general area considered is broadband noise transmitted to an enclosed area. We are investigating Active Structural Acoustic Control (ASAC) on the enclosure, and Active Noise Control (ANC) in the enclosed space. Our work tries to introduce novel aspects of multivariable control to this field and is focused on two problems. For the ASAC problem we want to develop techniques for the joint design of the ``smart structure'', the placement of the sensors and actuators, and the synthesis of the control law. For ANC we propose to look at the three-dimensional problem with special emphasis on hitherto neglected aspects of feedback control. The work builds on decades of experience at our lab in robust control, system identification and adaptive control and consists of a balance of simulation, theory and experimentation.

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