21. The World Of Sound And Vibration Specialist company in northern Europe offering acoustics, noise and vibration services for industry, community, building, automotive and product development customers. http://www.ingemansson.com

22. LORD Corporation - Adhesives, Coatings, Vibration And Motion Control, And Magnet Products from a manufacturer of active noise and vibration control systems for passenger aircraft. http://www.lord.com

23. ANC News Active Noise Control News. Selected events in Active Noise Control Digisonix has been reorganized after Nelson Industries was bought by Cummins Engine. http://www.signalsystemscorp.com/anc_news.htm

Home Projects Contact Personnel ... Up Active Noise Control News Selected events in Active Noise Control: Digisonix has been re-organized after Nelson Industries was bought by Cummins Engine. The focus of Digisonix has migrated from HVAC noise reduction to internal combustion exhaust noise reduction. The technical staff has reduced in size. Cymer, a leading supplier of excimer light sources used in semiconductor manufacturing, has completed its acquistion of ACX (Active Control eXperts), a leading developer of active vibration reduction products. ACX will be focused on reducing nano-scale vibration in next generation semiconducter capital equipment. Before focusing on semiconducter manufacturing applications, ACX's commerical plans included vibration reduction solutions for sporting equipment (bats, snowboards, etc.). More information can be found at ACX Labs web site: ACX Website

24. Active Noise Control Hearing Protection | HEARing CRC It has been observed that most people do not like wearing hearing protectors (earmuffs) either in the workplace and/or during recreational activities. http://www.hearingcrc.org/research/projects/r363

Search this site: HOME ABOUT US Introduction Listen Hear! ... CRC Corporate Publications Image: RESEARCH About our Research R1: Biomolecular, genetic, physiological solutions R2: Intelligent Sound Processing R3: Integrated Bioengineering ... Project leaders Active noise control hearing protection Program: Project area: R3.6: Comfort, safety and intelligibility Project-ID: Project Status: Ongoing Background It has been observed that most people do not like wearing hearing protectors (earmuffs) either in the workplace and/or during recreational activities. While most individuals understand the risks involved due to inadequate hearing protection in noisy environments, reasons for not wearing earmuffs include: discomfort changed ability to hear important sounds (for example machinery) difficulty communicating with others in their viscinity. Detail This project aims: to develop more effective hearing protectors that reduce many of these issues, and to assist our commercial partners in development of hearing protection products.

25. Acoustic Standards Provides Commercial Soundproofing And Noise Controls Products Supplier of a range of sound control products for commercial, industrial, home or office applications. http://acousticstandards.com/

Product List: Choose one... Acoustical Blankets Acoustical Enclosures Acoustical Fabrics Baffles Ceiling Tiles Foam Products Recording Booths Home Products Client List Company For over 25 years, we have provided our customers with competitive rates and exceptional acoustical products. We pride ourselves on FAST delivery and making sure you get EXACTLY what you need. Our knowledgeable staff can guide you to the best solutions at the most reasonable cost. Whether you're a Contractor, Architect, Facilities Manager, or Homeowner, we can help you. Our seasoned team has worked on a wide variety of jobs, including: gymnasiums, multipurpose rooms, auditoriums, office buildings, home theaters, recording studios, institutional and industrial projects. So call us today...you are sure to benefit from our TWO DECADES of sound proofing and noise reduction experience! Products Acoustic Foam - SONEX Fabric Panels Barriers Perforated Metal Panels ... Prospec Decibel Drop Call Toll Free: 1-800-570-5601 Legal Acoustic Standards provides quality soundproofing materials and noise control products for your acoustical needs, for reducing noise, acoustic insulation, sound damping and echo absorption. Acoustic Standards specializes in metal wall and ceiling tiles, perforated metal panels, sonex panels, acoustic wall and ceiling panels, fabric acoustic wall panels and acoustic foam.

26. Active Noise Control FAQ V1996-03-14 From ruckman@xis.com (Dr. Chris Ruckman) Newsgroups alt.sci.physics.acoustics, comp.dsp Subject Active Noise Control FAQ v199603-14 Date Fri, 15 Mar 96 015030 GMT http://www.faqs.org/faqs/active-noise-control-faq/

27. Active Noise Control Using Phased-array Active Resonators - US 5778081 An active noise control system includes sensors 16,26 which detects noise 114 and provides electronic signals to an active noise control (ANC) controller 20. The http://www.patents.com/active-noise-control-using-phased-array-active-resonators

28. Bosco Italia INSONORIZZAZIONE - Insonorizzazione Industriale, Acustica, Silenzia Italian company offering diagnosis, soundproofing and sound absorbing services in the fields of aeronautics, motoring, energy, road building and railways. http://www.boscoitalia.it/default_eng.asp

29. Active Noise Control Introduction Passive suppression of lowfrequency noise or vibration has numerous disadvantages, mainly because of the volume of the absorbers. http://home.mit.bme.hu/~sujbert/active.html

Introduction Passive suppression of low-frequency noise or vibration has numerous disadvantages, mainly because of the volume of the absorbers. By the usage of signal processors it has became possible to utilize different active noise control methods. These are based on the phenomenon of the destructive interference. A "secondary" noise has to be generated, which suppresses the "primary" (i.e. the original) noise at the properly situated microphones. The whole problem has both acoustical and control aspects. In some cases, if the secondary source can be implemented near to the primary source (e.g. a ventilation duct), a single loudspeaker - microphone pair is enough. In other cases, if the noise source is not concentrated, and the suppression in an enclosure has to be achieved (e.g. an airplane), more loudspeakers and microphones are utilized. Active noise control is a new research and development direction at our department. However, the knowledge-base in measurement, system identification and signal processing helps us to obtain new results in this field. Technical Background Active noise control requires multifarious knowledge, such as measurement, analog and digital signal processing and acoustics. Design of active noise control systems needs

30. NVH Technologies Supplier of active noise cancellation and active vibration cancellation solutions that reduce noise, vibration, and harshness in indoor settings. http://nvhtechnologies.com

Click here to proceed Click here to proceed

31. Active Noise Control Some New Developments in Active Noise Control Some New Developments in Active Noise Control DARPA AirCoupled Acoustic Sensor Workshop at Crystal City, Virginia, August 24-25 http://www.darpa.mil/mto/archives/workshops/sono/presentations/signalsep.pdf

32. Control Theory Brief introduction to the feedback theory in plain text. Addresses infinite dimension systems, active noise control, non-linear systems and related applications. http://www.math.uwaterloo.ca/AM_Dept/research/control.shtml

/* Changed to use separate display and positioning CSS March 28 2007 */ @import url("/AM_Dept/supportFiles/cssFiles/layout/positioning2Col.css"); /* Changed to use separate display and positioning CSS March 28 2007 */ @import url("/coreTemplates/CSSFiles/display/fontDefaults.css"); @import url("/coreTemplates/CSSFiles/display/MathExtraFonts.css"); @import url("/coreTemplates/CSSFiles/print/MathPrint.css") print; @import url('/AM_Dept/supportFiles/cssFiles/AMath.css'); @import url("/coreTemplates/CSSFiles/mobile/MathMobile.css") handheld; Search Math uwaterloo.ca Applied Math Home Department Members Research Overview ... Useful Links Control Theory In general terms, control theory can be described as the process of influencing the behaviour of a physical system to achieve a desired goal, primarily through the use of feedback . It is important in a diverse range of scientific and engineering disciplines including such things as the design of robotic systems, the positioning of communication satellites, the reduction of noise and vibration in structures, the control of so-called smart materials, and the regulation of biological systems. Current research includes the following topics: Infinite-dimensional systems: Infinite dimensional systems arise in the control of systems modelled by partial differential equations or delay differential equations . The goal of the research is to investigate whether control systems with boundary control and/or point sensing have desirable mathematical properties such as being well-posed and stable. Results such as these are of practical importance because they facilitate the design of controllers for these systems.

33. Active Noise Control - Programs - NRC-CNRC Institutional links. Lefthand Menu. About NRC; Business Opportunities and Services; Our Research. Areas of Research; Research Programs; Research Projects; Discoveries http://www.nrc-cnrc.gc.ca/eng/programs/iar/noise-control.html

@import url(/css/base2.css); National Research Council Canada www.nrc-cnrc.gc.ca Skip to content Skip to institutional links Common menu bar links Français Home Contact Us Help ... Research Programs Active Noise Control Institutional links Left-hand Menu About NRC Business Opportunities and Services Our Research Areas of Research ... Proactive Disclosure Search All NRC This section Enquiries: NRC-IAR Phone: 613-990-0765 1200 Montreal Road, M-3 Ottawa, Ontario, K1A 0R6 Canada Careers Jobs Available Now Working for NRC News 15 years, 150+ patents and 1,500 employees later NRC collaborates with EC and CSA to validate satellite-based cloud measurements [View all News for NRC-IAR] Events View all NRC Events Related Information NRC Canadian Neutron Beam Centre NRC Institute for Aerospace Research Key Sectors Aerospace Areas of Research Aerospace Communities Ottawa 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.

34. Applied Acoustics - Active Noise Control Active Noise Control. Applied Acoustics Education Course Pages Active Noise Control. General Course Information. Lecturer Wolfgang Kropp. Assistant Jonas Svensson Lab. assistant http://www.ta.chalmers.se/education.php?page=cpg_anc

35. Silentium Come to hear about our groundbreaking Development Active Noise Control innovations at http://www.silentium.com/

Call Us @ Home About Company Profile Active Noise Control ... Buy Now Beat your Competitors by embedding Silentium in your products Competition is a Nightmare? Is it tough to differentiate your product in your market? Generating a good feature that will differentiate your products from your competitors is not easy! Think how easier it will become for your sales force to sell a product that produces less noise then the competition… “Silentium helped us reduce the noise level in our Cooker Hoods by 50%.We now have a major USP that will definitely help us differentiate our products, ease our sales procedure and increase our sales…” Lei Ming, King Bright Home appliances Sell Quieter Products… Research clearly demonstrates that chronic exposure to high levels of noise affects not only our hearing but also our stress levels and productivity, and ultimately, our physical and mental health. If your product produces Noise, Silentium will remove most of it and enable an aquarium Sensation to your products… Customers Contact Us Free Promotion Message cforms contact form by delicious:days "Silentium helped us optimize our Server Racks, We were suffering from great noise levels. After embedding the active noise reduction technology our server became almost Silent!!!"

36. Publications On Active Noise And Vibration Control -- Scott C. Douglas I have been involved in the development of several DSPbased active noise control systems, including a personalized, ``boom-box''-style noise control system that I helped develop http://lyle.smu.edu/~douglas/pubanvc.html

[This page is no longer being updated. Go to my homepage for my current contact information or to my list of publications to download papers. SCD] 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

37. Active Noise Control - DiracDelta Science & Engineering Encyclopedia Active Noise Control Science and Engineering Encyclopedia http://www.diracdelta.co.uk/science/source/a/c/active noise control/source.html

38. ASA 147th Meeting Lay Language Papers -Active Noise Control Active Noise Control Kenneth Cunefare ken.cunefare@me.gatech.edu Department of Mechanical Engineering Georgia Institute of Technology. Special Lay-Language Paper for the http://www.acoustics.org/press/147th/active-noise.htm

147th ASA Meeting, New York, NY Special Lay Language Paper Index Press Room Active Noise Control Kenneth Cunefare - ken.cunefare@me.gatech.edu Department of Mechanical Engineering Georgia Institute of Technology Special Lay-Language Paper for the 75th Anniversary Meeting of the Acoustical Society of America May 2004 Active noise control, the suppression of an undesired sound by the action of another sound, has had a long and not entirely painless development arc over the past 70 years. From its genesis in the 1930s, to the current state with consumer products on the market, the development of active noise control has closely paralleled and depended upon the advancement of low-cost electronics. The basic elements of an active noise control system include one or more microphones to sense the noise over some location of interest and a means to produce an appropriately tailored sound field that acts as a "control field." The control field is usually created through the action of a control system connected to loudspeakers. Applications of the concept have included control of noise produced by industrial fans, suppression of noise in heating, ventilation, and air conditioning ducts, reduction of vehicle exhaust sounds, creation of "quiet zones" within vehicle interiors, reduction of the noise levels inside aircraft and spacecraft launch fairings, and the now almost commonplace active noise control headsets in aviation and consumer use.

39. Active Noise Control The aim of Advances in Acoustics and Vibration is to act as a platform for dissemination of innovative and original research and development work in the area of acoustics and http://www.hindawi.com/journals/aav/2008/350943.html

Advanced Search Hindawi Publishing Corporation Home Journals About Us About this Journal ... Table of Contents Journal Menu Abstracting and Indexing Aims and Scope Article Processing Charges Articles in Press ... Complete Special Issue Advances in Acoustics and Vibration Volume 2008 (2008), Article ID 350943, 2 pages doi:10.1155/2008/350943 Editorial Active Noise Control Marek Pawelczyk Institute of Automatic Control, Silesian University of Technology, Akademicka 16 Street, 44-101 Gliwice, Poland Received 16 June 2008; Accepted 16 June 2008 Active noise control generally aims at reducing an unwanted and unpleasant sound referred to as the noise. The general idea is very simple. However, there are many problems related to the acoustic phenomena as well as control limitations. Thus, the problem is still exciting and attracts attention of a number of scientists originating from different scientific disciplines. Rapid development of technology and extensive research allow for manufacturing sensors and actuators of more advantegous properties, designing more robust and effective algorithms, and finally performing succesful applications in different noise pollutted areas. The aim of the special issue is just to present recent advances in active noise control and its applications. I would like to thank all the authors who accepted my invitation and decided to share their work with a wide circle of readers, what the open-access journal offers. The papers published in this issue were peer-reviewed by independent experts. I appreciate help of the experts very much. Even four reviews per paper where made. Therefore, the eight papers which are finally included in the issue are of very high quality. Below I am barely announcing main topics discussed in the issue.

40. Active Noise Control Active Noise Control . Architectures and Application Potentials . Shawn Steenhagen Applied Signal Processing, Inc. 3 Marsh Court http://www.danvillesignal.com/files/compdsp_Steenhagen_ActiveNoiseControl.ppt

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