61. Active Noise Control In Home Environment Back. active noise control in Home Environment. Supervisor Håkan Hjalmarsson. Examinator Håkan Hjalmarsson Project background. Disturbing http://www.e.kth.se/~e98_pry/

KTH Search Active Noise Control in Home Environment Back Active Noise Control in Home Environment Supervisor: Håkan Hjalmarsson Examinator: Håkan Hjalmarsson Project background Disturbing noise is nowadays a major problem in the society as a whole. In the home environment I have always thought that the vacuum cleaner is a noise making monster. But I had never though about a solution until I took a course in adaptive signal processing. In that course I realized that the solution maybe isn't so far away. That's why I want to do this thesis project. Prior work in this area has been focused on improving low frequencies attenuation in passive ear protectors with active noise attenuation techniques. The new in this thesis project is that only active noise attenuation techniques will be used. The implementation to vacuum cleaner noise attenuation is also new. Solution The algorithm used is the Fx-LMS algorithm. This algorithm automaticly compensates for changes with time and nonstationarities. Documents Thesis Proposal Thesis Report References Active Noise Control Active Noise Control: A Tutorial Review Last modified March 13, 2003

62. Noise Control & Soundproofing - Thomas Register EZ Directory Noise Control Products Soundproofing, Soundproof Rooms, Soundproofing Material, Industrial Noise Control, active noise control, Noise Control Product, Noise http://www.thomasregisterdirectory.com/noise_control/

Noise Control Top quality noise control manufacturers have been highlighted in this comprehensive source for the industrial marketplace. A broad range of noise control manufacturers have been complied in this industrial portal designed to provide information on manufacturers, distributors and service companies. Thomas Register Directory Environmental Noise Control Below are some of our most requested Noise Control categories. Click to view... Acoustical, Noise, Sound Insulation Noise Absorption Materials Noise Mufflers Noise Barrier Materials ... Page 1 Displaying 1 - 25 of 63 companies for the search term: Noise Control Acoustical Surfaces, Inc. Chaska, MN Website CAD Industrial Noise Control Inc. North Aurora, IL Website Product Catalog Singer Safety Company, A Rensel Chicago Company Chicago, IL Website Technicon Industries, Inc. Concord, NC Website Isolation Technology Inc. Massapequa, NY Website Wind Gap, PA Website Kinetics Noise Control, Inc. Dublin, OH Website E-A-R Specialty Composites Indianapolis, IN Website Press Releases: E-A-R Acoustical Foams Meets UL Smoke and Flame Standard Tough New Composite Blocks Engine Noise, Reflects Heat

63. IBP - Active Noise Control interference of outof-phase pressure waves (anti-noise) actively absorbing silencers represent a new advantageous technique of active noise control in HVAC http://www.ibp.fhg.de/rata/en/aktiv1-e.html

Fraunhofer Institute of Building Physics (IBP) Research Fields and Contacts Room Acoustics / ... Fraunhofer-Gesellschaft Research Field : "Active Silencers" Introduction In comparison with the well known principle of noise cancellation by destructive interference of out-of-phase pressure waves (anti-noise) actively absorbing silencers represent a new advantageous technique of active noise control in HVAC-ducts. This refers not only to the robust structure of the system but also to the underlying principle of operation which goes without sophisticated and expensive digital signal processing. Construction and operation Our active silencers are built up of single cassettes which contain the active components (loudspeaker, microphone, analogue signal processing) covered by perforated sheet metal and glass fiber fabric ( Figure 1 Fig. 1 : Construction of a single active silencer cassette (ASC)

64. Publications About 'Active Noise Control' BACK TO INDEX Publications about active noise control . Articles in journal or book s chapters. Alberto 1998. Keywords active noise control. http://gpiserver.dcom.upv.es/publications/Keyword/ACTIVE-NOISE-CONTROL.html

BACK TO INDEX Publications about 'Active Noise Control' Articles in journal or book's chapters Alberto González, Antonio Albiol , and S. Elliot. Minimisation of the maximum error signal in active control IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING (ISSN 1063-6676) Keywords: Active Noise Control bibtex-entry Carlos Hernández, Antonio Albiol , and Alberto González. Cancelación Activa de Ruido en Conductos REVISTA DE ACÚSTICA (ISSN 0210-3680) , pp 203-205, 1997. Keywords: Active Noise Control bibtex-entry Conference's articles Alberto González and Antonio Albiol Minimisation of the maximum error signal in active control . In Proceedings of ICASSP , München, Germany, pages 387-401, 1997. Keywords: Active Noise Control bibtex-entry Alberto González, Antonio Albiol , and Elisa Cervantes. A Practical Approach for the Minimisation of the Maximum Error Signal in an Active Control System . In International Symposium On Active Control of Sound and Vibration , Budapest, Hungary, pages 789-800, 1997. Keywords: Active Noise Control bibtex-entry Antonio Albiol , Alberto González, and Luis Vergara. A new Adaptation Algorithm for Active Control of Sound . In 21st Annual Conference of the IEEE Industrial Electronics Society (IECON '95 , Orlando, USA, pages 1000-1005, 1995.

65. Thayer School - Research In Active Noise Reduction conducted jointly by Thayer School and Dartmouth Medical School using active noise reduction (ANR)—aka, active noise control, or active noise cancellation. http://engineering.dartmouth.edu/thayer/research/noisereduce.html

Thayer School Menu About Thayer Open Positions Dartmouth Home Faculty Research Academics and Admissions Career Services Student Life Alumni/ae Directories Site Index Thayer School Home Areas of biomedical research Imaging Orthopaedics/biomechanics Electromagnetic, radiation, and laser-based research Cardiorespiratory variability in neonates ... Therapeutic protein engineering Active noise reduction Active Noise Reduction Bioengineering applied to human auditory systems in hearing protection, hearing enhancement, and advanced communication systems. High environmental noise levels constitute a serious threat to the hearing of factory workers, emergency personnel, military personnel, and others who work for long periods in noisy environments. Today, over 20 million Americans suffer from noise-induced hearing loss. The cost of care and compensation for military personnel alone exceeds $300M annually and constitutes the largest defense-related disability expenditure. (High noise levels also severely degrade speech intelligibility in communication systems.) While lengthy exposure to noise levels below approximately 80 dB does not permanently damage hearing, exposure to levels above 80 dB must be limited, and even short duration exposures in the "red" zone can cause instantaneous hearing loss through the stretching and tearing of tissue in the inner ear.

66. Development Of A New Active Noise-control Strategy 093034 Completed, active noise control is a technique based on the generation of an interfering noise that cancels out harmful noise. http://www.irsst.qc.ca/en/_projet_251.html

Home About the IRSST Research priorities Research projects ... New projects Research project Development of a new active noise-control strategy Alain Berry, Jean Nicolas, Bruno Paillard / Université de Sherbrooke 093-034 : Completed  Active noise control is a technique based on the generation of an interfering noise that cancels out harmful noise. This project focused on controlling the vibrations responsible for noise. This strategy has not been applied in industrial settings to date. On this basis, an active noise-control system was developed. It incorporates a sensor that is attached to a vibrating surface and detects the vibration responsible for generating noise. In response to this vibration, the sensor generates an electrical signal transmitted to a computer that controls the production of appropriate counter-vibration. Scientific publications and communications Charette C.,  Guigou C.,  Berry A.,  Plantier G.  Asymetric actuation and sensing of a beam using piezoelectric materials.  Journal of the Acoustical Society of America, vol. 95, no 4, 1994, p. 2272-2284.

67. [Noise And Vibration Engineering] Research Topics In Noise And Vibration active noise control is applied to attenuate exhaust noise of combustion engines. active noise control applied to acoustic enclosures. http://www.mech.kuleuven.ac.be/pma/research/mod/topics/topic03/default_en.phtml

Home PMA Research Vibro-acoustics ... Topics Active noise and vibration control 3. Research on active noise and vibration control Active control of exhaust noise of combustion engines Active and passive noise control in high speed cutting machines Model based active suspension control for a passenger car Multivariable feedback controller design to improve the tracking on an automotive vibration test rig ... Robust control of mechatronic systems with distributed parameters Active control of exhaust noise of combustion engines Active noise control is applied to attenuate exhaust noise of combustion engines. The active exhaust system requires less space and consumes less energy than a fully passive exhaust system. First, a cold engine simulator has been developed. This simulator produces the exhaust noise with the gasflow using compressed air. It allows acoustic and fluid-dynamic experiments on prototypes without taking precautions against the hot corrosive gases. Comparative experiments and simulations show a good agreement between the behaviour of the cold engine simulator and a real combustion engine. The active exhaust system consists of an electrically driven valve mounted in series with a buffer volume. Using the mean flow through the valve and the pressure fluctuation in the volume, the valve regulates the flow to the exhaust outlet such that only the mean flow passes through the exhaust outlet. The fluctuating flow is temporarily buffered in the volume. Simulations are carried out using electrical analogies to develop the exhaust system and to optimise the controller. Several control strategies as feedforward, feedback, adaptive feedforward and collocated feedback are simulated and tested on the cold engine set-up. The exhaust system is capable to attenuate the exhaust sound from 91dBA to 78 dBA, measured at 10 cm after the exhaust outlet. The mean backpressure to the engine remains below 10 kPa.

68. [Division PMA] Research Distributed actuators and sensors for active noise control (K. HENRIOULLE). The first is the active control of engine noise in a car interior. http://www.mech.kuleuven.ac.be/pma/publications/theses/01DP06_en.phtml

Home PMA Publications Theses Distributed actuators and sensors for active noise control (K. HENRIOULLE) October 2001, promoter: P. Sas, 01DP06, ISBN 90-5682-316-7. Abstract This thesis demonstrates the potential of distributed piezoelectric foils as sensors and actuators in active noise control systems. Distributed sensors and actuators offer many advantages over conventional point sensors and actuators as they are thin, lightweight and thus are easily integrated in existing structures. As such active noise control can be applied to a specific class of structures with strict limitations on mass and volume. They measure (excite) the structure over a large area. Three different types of active panels are developed based on PVDF piezoelectric material. The first is a flat acoustic actuator, capable of producing a large sound power output at low frequencies. The second is a smart foam consisting of PVDF material integrated in a passive sound absorbing material. The third is a panel equipped with a collocated volume velocity sensor/actuator pair, controlling the low frequency sound transmission through the panel. In addition a flat electrostatic loudspeaker panel is available for testing. The active panels are used as control actuator in four applications. The first is the active control of engine noise in a car interior. A second application is the active control of sound transmission through a single and double panel partition. Simulations show how the distributed actuator interacts with the passive system to reduce the sound transmission. The best and most practical configuration is experimentally validated. A third application is the active control of sound absorption. A final achievement is the experimental validation of a system that controls the sound transmission through a single panel partition with a PVDF volume velocity sensor/actuator pair.

69. Institute Of Noise Control Engineering USA air intake system 5,423,658 active noise control using noise source having adaptive resonant frequency tuning through variable ring loading 5,422,446 Panel http://www.inceusa.org/patent.sample.asp

INCE USA International INCE INCE Foundation Membership Information ... Technical Activities Reduced First-Year Dues USA $50 International $75 Students are always $20 Announcements ... Business Office Sample listing of patents related to noise and vibration Patent number, followed by description. Active vibration control system Method and apparatus for absorbing resonance vibration in a leaf spring in a suspension system Active vibration control through sensing and controlling forces on an intermediate body Dual bandpass secondary source Delayed resonators as active dynamic absorbers System for supressing engine exhaust noise Serpentine noise barrier Active vibration damper Muffler with catalytic converter arrangement; and method Noise attenuating internal combustion engine air intake system Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading Panel shaped element specifically for sound absorbing structures and a sound absorbing installation Vibration isolation mounting system Active acoustic attenuation system with indirect error sensing Method and apparatus for acoustical partition Apparatus for reducing noise in space applicable to vehicle passenger compartment Acoustical door Rotatable machine component with device for reducing acoustic vibrations Noise attenuation panel Sectional acoustical barrier wall system Acoustically quiet, passive load for testing low speed motors

70. Honda Installs Active Noise Control System On Its New "Accord" (000626) Honda installs active noise control system on its new Accord June 30, 2000. Honda Motor has equipped its new Accord Wagon with http://ne.nikkeibp.co.jp/english/2000/06/0626honda_v.html

Honda installs active noise control system on its new "Accord" June 30, 2000 Honda Motor has equipped its new "Accord Wagon" with an active noise control system that reduces the noise of driving inside the car for better audibility of music. This system, developed jointly with Matsushita Electric Industrial, comes as a standard equipment of the new model Accord Wagon released on June 2. This system is capable of reducing low frequency noise of around 40kHz produced inside the car when driving on rough roads. There is a microphone under the driver's seat to detect noise from the road surface and, by radiating a sound of the opposite phase from the audio speaker, it becomes possible to cut the noise level. In 1991, Nissan Motor installed on its "Bluebird" a system using similar technologies to reduce the engine noise. Honda's system, however, is the first to reduce noise from the road surface. In addition, the noise control system was an option on Bluebird, whereas it comes pre-installed on Accord Wagon. Use of analog filters instead of digital filters has cut costs for standard installation, says Honda. The company plans to install its noise control system on other cars as well in the future.

71. Office Of Industry And Innovation - Active Noise Control active noise control. Led By frequency range. Whilst active noise control is not new, most applications require the user to wear a headset. http://www.oii.uwa.edu.au/innovations/physical_sciences/active_noise_control

Office of Industry and Innovation Prospective Students Current Students Staff Alumni ... About Search UWA UWA Website This Site People UWA Expert Structure Intranet for Home Researchers Innovations Biotechnology and Biomedical ... Links Active Noise control Led By Dr Roshun Paurobally, a team of engineers has developed an active noise control system for reducing the ambient noise levels in heavy earth moving vehicles. Supported by Alcoa, this research resulted in a successful demonstrator that significantly reduced the low-frequency noise levels experienced by crews of large vehicles used extensively in the resources sector. Working long shifts under adverse conditions, operators were finding that employees were becoming tired, were easily distracted and starting to make mistakes. As well as the obvious health concerns, operators were seeing increased accident / incidence rates and a drop off in productivity. The research team has developed a sophisticated, multi-channel active noise control system which provides a substantial reduction in the ambient noise levels in the target frequency range. Whilst active noise control is not new, most applications require the user to wear a headset. The innovative aspect here is that the users do not have to wear headsets, making its application in industrial environments much more appealing. The next step is to optimise the Digital Signal Processing (DSP) modules and cost reduce the current system to generate an economically-priced product. As well as having applications in multi-spectral, multi-channel environments, the research group is looking to adapt the technology to simpler, single-channel applications. As an example, a single channel system could be used to significantly reduce the ambient noise levels resulting from an air conditioning duct, swimming pool pump or similar.

72. The Power Of Research - Joint Presentation ONERA-DLR At Paris Air Show 2001 active noise control (ANC) on a Counter Rotating Fan. Fan noise reduction in the inlet of aero engines is usually performed by passive http://www.onera.fr/onera-dlr/anc.html

Welcome Introduction Program How to reach us ... The DLR/ONERA low noise rotor ERATO Paris Air Show, 2001 Menu Welcome Introduction Program Safety Noise Emissions Air Traffic ATA EREA Identity ONERA Identity DLR Press Pratical Informations Active Noise Control (ANC) on a Counter Rotating Fan In the framework of a national research project, in which MTU, DLR Institute for Propulsion Technology and EADS Corporate Research Center Germany participate, active noise control (ANC) has been tested at a scale model of a counter rotating fan for a high bypass ratio aero engine at the compressor test facility of DLR in Cologne. ANC was performed in the inlet duct of the fan model, using 32 microphones as error-sensors and 32 loudspeakers as secondary sources, driven by a 32-channel controller from EADS. The sound fields with and without the application of ANC were mapped by 96 wall-flush mounted microphones. The radiated sound power was calculated by means of a radial mode decomposition of those sound fields. ANC was successfully applied to the BPF1- and the 2*BPF1-tone of the fan. The achieved in-duct sound power reductions were 15.8dB (only 2*BPF1-tone controlled) and 26.4dB/7dB (BPF1- and 2*BPF1-tone controlled simultaneously). Four microphones located in the large settling chamber upstream of the inlet duct documented also a reduction of the tone-levels in a quasi free field condition.

73. Alexa Web Search - Subjects > Science > Technology > Acoustics, Ultrasound And V active noise control Subjects Science Technology Acoustics, Ultrasound and Vibration active noise control. Sort by Most http://www.alexa.com/browse/general?catid=48634&mode=general

74. Active Noise Control Primer BOOK REVIEW. active noise control Primer. He candidly admits that to date the practical (author s emphasis) applications of active noise control are few. http://www.iop.org/EJ/abstract/0957-0233/12/5/705

@import url(http://ej.iop.org/style/nu/EJ.css); Electronic Journals quick guide Journals sitemap: IOP home page IOP online services EJs HOME JOURNAL HOME   - Editorial information   - Scope   - Editorial board   - Submit an article   - Pricing and ordering   - Request sample copy EJS EXTRA   - IOP Select   - IOP Physics Reviews   - BEC Matters! SEARCH   - Content finder   - Default searches AUTHORS   - Submit an article   - Status enquiry   - Get LaTeX class file   - Classification schemes   - Scope   - Editorial board REFEREES   - Submit referee report   - Become a referee   - Update personal details   - Classification schemes   - Scope   - Editorial board LIBRARIANS   - Register your institution   - Pricing and ordering   - Library branding   - How to link to IOP journals   - Librarian help USER OPTIONS   - Create account   - Lost password Login Create account Alerts Contact us ... Table of contents Meas. Sci. Technol. (May 2001) 654 BOOK REVIEW Active Noise Control Primer Scott D Snyder (New York: Springer) 159 pp 2000 Price £41.00 ISBN 387 98951 X (hbk) It is rather rare for an active researcher in a particular discipline to be critical about the contributions made by his/her field of research towards technology. As becomes apparent by reading the preface, the author of this book is refreshingly different. He candidly admits that to date the

75. Active Noise Control. Fundamental For Acoustic Design. Voluyme I active noise control. Fundamental for Acoustic Design. Its theme is a critical study to convey and encourage creative thinking about (active) noise control. http://www.booknews.co.uk/Books/1738.htm

Active Noise Control. Fundamental for Acoustic Design. Voluyme I Buy a book.. Author(s): G. Rosenhouse Publisher: ISBN: Format: hardback Price: Review Date: January 15, 2001 Review: Active noise and vibration control (ANVC) is a modern technology characterised by both high-tech components and an ever-increasing range of applications in disciplines as diverse as civil, mechanical and aeronautical engineering. This, the first of three volumes on the subject deals with the relevant ideas, functions and principles of acoustics. Its theme is a critical study to convey and encourage creative thinking about (active) noise control. It gives an insight into the fundamentals and technology of ANVC, and explains the physical, biological (and psychological) principles as well as the control principles that are involved. The author also goes beyond Lueg's basic 1933 definition and expands the concept to allow for applications in many fields of engineering.

76. SWITCH - Swiss Research Teams Index Swiss Research Teams Index. Query Result. Research Team(s) with Keyword active noise control Automatic Control Laboratory Swiss http://www.switch.ch/edu/research_index.html?script=user_getdata&keyword=Active

77. Active Noise Control Systems: Algorithms & DSP Implementations active noise control Systems Algorithms DSP Implementations Search for books at engineering-books-online.com. engineering-books-online.com. http://engineering-books-online.com/0471134244.html

Home Search High Volume Orders Links ... Soil Engineering Additional Subjects Mister Rogers' Playbook Operating systems (Computers) Administration Textile fabrics Kosode Being Zen: Bringing Meditation to Life ... Massacre on the road to Dunkirk: Wormhout, 1940 Written by Sen M. Kuo Dennis R. Morgan Published by Wiley-Interscience (January 1996) ISBN 0471134244 Price $130.00 Customer Reviews This excellent text is written for advanced study and practicing engineers who need to design controllers for active noise control systems. The emphasis is on the algorithms that are usually implemented in a Digital Signal Processor. The book's treatment of acoustics, sensors, and actuators is not as in-depth as texts by Fuller or Nelson. Included in the book is C and assembly code for the most popular adaptive control techniques, but beware of bugs and patent issues. One of the algorithms covered in detail is the Filtered-X Least Mean Squares technique that one of the Authors (Morgan) help to make popular in the community. Look for related books on other categories Algorithms Technology Signal Processing (Communication Engineering) Telecommunications ... Signal processing Other related products Still didn't find what you want?

78. IEEE Xplore Down With Noise [active Noise Control] Down with noise active noise control Elliott, SJ Southampton Univ.; This paper appears in Spectrum, IEEE Publication Date Jun 1999 On page(s) 5461 Volume http://ieeexplore.ieee.org/xpl/abs_free.jsp?arNumber=769270

79. [International Conference On Noise And Vibration Engineering] ISMA Related Ph.D. K. HENRIOULLE, Distributed actuators and sensors for active noise control, 2001. Abstract. The first is the active control of engine noise in a car interior. http://www.isma-isaac.be/publications/phd2001/khenrioulle_en.phtml

ISMA Home Publications K. HENRIOULLE , Distributed actuators and sensors for active noise control, 2001 Abstract Order Code Code: 01D6 Katholieke Universiteit Leuven Department of Mechanical Engineering Reactions on content: ISMA-Webmaster Last update: 01/10/2002 URL: http://www.isma-isaac.be/publications/phd2001/khenrioulle_en.phtml

80. Yet2.com - TechPak - Ear Defenders Employing Active Noise Control Enter a keyword or phrase below, and search now to find other technologies of interest. Search. TechPak, Categories. Ear defenders employing active noise control. http://www.yet2.com/app/utility/external/indexpatent/27331

Welcome yet2.com is the online marketplace that enables interactive technology transfer between corporations, academic institutions, national labs, technology brokers and individual inventors. more... Interested? This is an abstract of a technology that is available for sale or license. yet2.com can introduce you confidentially to the owner of this technology. To view the complete TechPak, please register with us. Still looking? Enter a keyword or phrase below, and search now to find other technologies of interest. TechPak Categories Ear defenders employing active noise control An ear defender having one or more microphones (1) for detecting the sound level in the proximity of the wearer's ear, one or more speakers (4) for generating a noise reduction signal within the earshell, and a digital feedback controller (W) for generating a feedback signal derived from the output of the microphones and for applying said feedback signal to the speaker inputs, and estimation means (F') for providing an estimation of the earshell transfer function and subtracting from the input to the feedback controller a signal representing the estimated electroacoustic transfer function of the system. The operation of the digital feedback

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