41. SLI | Noise Assessment And Control | Noise Management active noise control ANTI-NOISE . ANTI-NOISE IS USED TO CANCEL THE EXISTING NOISE. Therefore active noise control has been developed as an alternative. http://www.safetyline.wa.gov.au/institute/level2/course18/lecture137/l137_10.asp

Home CONTENTS Lecture Information Introduction New Workplaces - New Equipment New Workplaces - Layout ... Review Questions ACTIVE NOISE CONTROL - "ANTI-NOISE" "ANTI-NOISE" IS USED TO CANCEL THE EXISTING NOISE The control of low frequency noise by traditional means has always been difficult and expensive because it requires the use of large mufflers, heavy enclosures or extensive structural damping systems. Therefore active noise control has been developed as an alternative. ACTIVE NOISE CONTROL A technique that uses the principle of wave cancellation by generating a pressure wave that is exactly 180 degrees out of phase with the original wave and of the same magnitude. The basic principle of active noise control is to create "anti-noise" in order to cancel the existing noise. Leventhall (1992) explains that an active noise control system "consists of the input microphone that picks up the pressure variation and the controller that generates a signal to the loudspeaker which will create an opposing pressure precisely when the noise wave reaches the loudspeaker. An error microphone downstream from the speaker monitors the residual acoustic pressure after cancellation and signals the controller to adjust itself for optimum results". AS/NZS 1269.2, 1998:

42. Noise Control Case Study | Active Control Of Fan Noise New noise control technology. active noise control is a technology using noise to reduce noise. active noise control system installation. http://www.safetyline.wa.gov.au/pagebin/noisgenl0050.htm

Home Laws Essentials Industries ... [Print Format] Introduction On the ground floor of the Civil and Mechanical Engineering Building at the University of Western Australia is a small computer room that houses the mainframe computer network. An exhaust fan mounted inside the room runs continuously to discharge the hot air into the corridor, in order to cool down the equipment inside the computer room. The fan generated low-frequency tonal noise into the corridor, which caused noise levels in a very large area of the corridor to be over 55 dB(A) and annoyed a very large number of staff and students. Low-frequency noise is very penetrating, travels very long distances and is difficult to attenuate using traditional passive control measures. Passive noise control technology, which usually involves using absorptive materials or noise partitions, can be bulky, ineffective and rather expensive at low frequencies. Active Noise Control (ANC), on the other hand, can be very efficient and relatively cheaper in reducing low-frequency noise. This case study demonstrates a successful application of ANC - a new technology of noise control for low-frequency noise - to a noise problem in an educational building.

43. ISVR - Institute Of Sound And Vibration Research active noise control in a Room. active noise control. The ISVR has been involved in active control research for many years. Why active noise control ? http://www.isvr.soton.ac.uk/SPCG/Tutorial/Tutorial/Tutorial_files/Web-further-an

Animations of Acoustic Waves WAVE BASICS WAVE INTERACTION STANDING WAVES HEARING SOUNDS FURTHER CONCEPTS LEARN MORE UNIVERSITY OF SOUTHAMPTON FURTHER CONCEPTS Active Noise Control in a Room ACTIVE NOISE CONTROL The ISVR has been involved in active control research for many years. Early work was carried out on active headsets, and further studies were undertaken on the active control of enclosed soundfields. Why Active Noise Control ? There are several ways to reduce the noise levels emitted by a sound source in a room. One standard approach consists of passive noise absorption , i.e. covering the walls with absorbing materials like glassfibre coatings. These materials dissipate acoustic energy into heat and so contribute to the noise reduction, but they work best at high frequencies (e.g. above 500 Hz). Active Noise Control systems have been developed to overcome the limitations of passive strategies at low-frequencies (e.g. below 100 Hz). How does it work ?

44. ISVR - Active Noise Control Pages - Spectrum Article Practical control systems for combatting audible noise show up nvs bombardier.com lordcorp.com racalacoustics.co.uk bose.com nct-active.com swiftnet http://www.isvr.soton.ac.uk/ACTIVE/Spectrum.htm

Down with Noise Practical control systems for combatting audible noise show up in aerospace, general aviation, and military roles Steve Elliott IEEE Spectrum Magazine July 1999 Low resolution (Each page ~150K) High resolution (Each page ~300K) The web addresses of the companies mentioned in this article are: ultraquiet.com/nvs bombardier.com lordcorp.com racal-acoustics.co.uk ... swiftnet.com.sg/lectret Further information about active control research may also be found at: isvr.soton.ac.uk/active/ val.me.vt.edu mecheng.adelaide.edu.au and a list of other internet resources is provided at: hh.se/staff/wolfgang/orpheus/anclinks Prof. Elliot's email address is sje@isvr.soton.ac.uk

45. A "New" Approach To Active Noise Control In Ducts TITLE A New Approach to active noise control in Ducts; AUTHORS Mehta, P., Zheng, Y., Chait, Y., and Hollot, CV; ABSTRACT In this http://www.ecs.umass.edu/mie/labs/dacs/approach.html

DACS Home Projects Mission Research Topics ... UMass Amherst TITLE: A "New" Approach to Active Noise Control in Ducts AUTHORS: Mehta, P., Zheng, Y., Chait, Y., and Hollot, C.V. STATUS: in Active Control of Vibration and Noise, ASME Vol. DE, pp. 25-36 (presented at the Active Control of Vibration and Noise Symposium, ASME ICE, Nov. 17-22, 1996). DATE OF ENTRY: November 07, 1996 full paper (postscript, 98KB) accompanying figures (postscript file, 1,097KB) Zip file (147KB) Back to DACS Laboratory Last Updated: January 26, 2001 chait@ecs.umass.edu

46. Active Noise Control In Ducts: Feedforward/Feedback Design By Blending HINFINITY TITLE active noise control in Ducts Feedforward/Feedback Design by Blending HINFINITY and QFT Methods; AUTHORS Mehta, P., Zheng http://www.ecs.umass.edu/mie/labs/dacs/active.html

DACS Home Projects Mission Research Topics ... UMass Amherst TITLE: Active Noise Control in Ducts: Feedforward/Feedback Design by Blending HINFINITY and QFT Methods AUTHORS: Mehta, P., Zheng, Y., Hollot, C.V., and Chait, Y. STATUS: Procs. 13th IFAC World Congress, Vol. H, pp. 191-197. DATE OF ENTRY: November 07, 1996 full paper (postscript file, 141KB) accompanying figures (postscript file, 79KB) Zip File (52 KB) Back to DACS Laboratory Last Updated: January 26, 2001 chait@ecs.umass.edu

47. :: Ez2Find :: Active Noise Control Guide active noise control, Global Metasearch Any Language Guides, active noise control. ez2Find Home Directory Science Technology http://ez2find.com/cgi-bin/directory/meta/search.pl/Science/Technology/Acoustics

Guide : Active Noise Control Global Metasearch Any Language English Afrikaans Arabic Bahasa Melayu Belarusian Bulgarian Catala Chinese Simplified Chinese Traditional Cymraeg Czech Dansk Deutsch Eesti Espanol Euskara Faroese Francais Frysk Galego Greek Hebrew Hrvatski Indonesia Islenska Italiano Japanese Korean Latvian Lietuviu Lingua Latina Magyar Netherlands Norsk Polska Portugues Romana Russian Shqip Slovensko Slovensky Srpski Suomi Svenska Thai Turkce Ukrainian Vietnamese Mode All Words Any Word Phrase Results Timeout Depth Adult Filter Add to Favorites Other Search Web News Newsgroups Images Invisible Web Sport Event Name Zip or State (optional) Source: [ Active Metasearch ASPWire AspZone NIST Guides Active Noise Control ez2Find Home Directory Science Technology ... Acoustics, Ultrasound and Vibration : Active Noise Control Related Categories Business: Energy and Environment: Environment: Noise and Vibration Control: Products: Control Web Sites Frequently Asked Questions about Active Noise Control [Site Info] [Translate] [Open New Window] Provides answers to common questions about active noise control including a discussion of popular misconceptions about what active noise control can and cannot do. URL: http://users.erols.com/ruckman/ancfaq.htm

48. Improved Active Noise Control Performance Based On Laguerre Lattice Improved active noise control performance based on Laguerre lattice. Source, Signal Processing archive Volume 84 , Issue 4 (April 2004) table of contents. http://portal.acm.org/citation.cfm?id=986403.986405&dl=portal&dl=GUIDE&CFID=1111

49. Active Noise Control Systems survey. active noise control Systems Algorithms and DSP Implementations, 1st edition. Purchase this Book Purchase this Book. Source, http://portal.acm.org/citation.cfm?id=553072&dl=GUIDE&coll=GUIDE&CFID=11111111&C

50. Active Noise Control Innovations And Patents active noise control Innovations and Patents. More information on active noise control and active noise control Research References. http://www.air.xq23.com/energy_science_resources/Active_noise_control.html

51. Polytopic Uncertainty Regions For State-space Models Using SMI Algorithms - Educ Robust active noise control. Subject Robust active noise control. Keywords robust control, adaptive control, system identication, active noise control. http://www.dcsc.tudelft.nl/Education/ThesisProposals/studentview037.html

People Education Research Industrial ... WBMT Polytopic uncertainty regions for state-space models using SMI algorithms Subject: Polytopic uncertainty regions for state-space models using SMI algorithms Staff Mentor: Ton van den Boom Other Mentor(s): Vincent Verdult Prerequisites: Research student Keywords: Identification Description: Over the past 5 years, the use of Subspace Model Identification(SMI) methods, as a system identification tool, has become well accepted. This is mainly due to the good performance of the algorithm with noisy data, it's ability to work transparently with Multi-Input/Multi output systems, and the ease of use. However, the theory of SMI, lacks a thorough error analysis. The effects of uncertainty in the data (noise) on the uncertainty in the obtained model remains as yet unknown. Such information is necessary for the design of robust controlers. Recent development of nonlinear optimization tools, such as Linear Matrix Inequalities, that are now used in the design of robust control, need the uncertainty described as a convex set. For this reason, polytopic bounds are investigated as a method of description of the uncertainties Information about the uncertainty region can be denoted in various forms, for instance circle bounds around parameters, or elliptic regions. However the desired form, from a point of view of the controller design, is a polytopic region in a higher dimensional space, in which the matrices of the obtained state-space model are certain to lie.

52. Active Noise Control active noise control Systems. Algorithms and DSP Implementations. Design of active noise control Systems With the TMS320 Family. Application Report. http://www.ceet.niu.edu/faculty/kuo/books.html

Active Noise Control Active Noise Control Systems Algorithms and DSP Implementations By Sen M. Kuo and Dennis R. Morgan Book Overview Table of Contents Software Real-Time Digital Signal Processing Implementations, Applications, and Experiments with the TMS320C55x By Sen M. Kuo and Bob H. Lee Book Overview Table of Contents Experimental Software Other Links ... Sen M. Kuo, Ph.D, Issa Panahi, Ph.D, Kai M. Chung, Tom Horner, Mark Nadeski, Jason Chyan

53. Preface Of Active Noise Control Book active noise control Systems Algorithms and DSP Implementations. Sen M. Kuo and Dennis R. Morgan. 1 Introduction to active noise control. 1.1 General Concept. http://www.ceet.niu.edu/faculty/kuo/books/acns/contents.html

Active Noise Control Systems - Algorithms and DSP Implementations Sen M. Kuo and Dennis R. Morgan Contents Preface Acknowledgments Introduction to Active Noise Control General Concept General Applications Air-Acoustic ANC Hydroacoustic ANC Vibration ANC ANC Systems Broadband Feedforward ANC Systems Narrowband Feedforward ANC Systems Feedback ANC Systems Multiple-Channel ANC System Performance Evaluation Adaptive Transversal Filters Introduction to Adaptive Systems Adaptive Algorithms MSE Performance Surface Method of Steepest Descent LMS Algorithm Performance Analysis of the LMS Algorithm The Stability Constraint Time Constant of the Adaptive Process Excess Mean-Square Error Modified LMS Algorithms Normalized LMS Algorithm Correlation LMS Algorithm Leaky LMS Algorithm Partial-Update LMS Algorithm Variable-Step-Size LMS Algorithm Signed LMS Algorithms Complex LMS Algorithm Analysis of Adaptive Systems Using the z -Transform Applications Adaptive Noise Cancellation Adaptive System Identification Adaptive Linear Prediction Broadband Feedforward Active Noise Control Basic Principles Simplified System Identification Scheme Coherence Secondary-Path Effects FXLMS Algorithm and Off-Line Secondary-Path Modeling Derivation of the FXLMS Algorithm Analysis of the FXLMS Algorithm Secondary-Path Equalization Off-Line Modeling Technique Effects of Modeling Errors Effects of Measurement Noise Leaky FXLMS Algorithm Feedback Effects and Solutions Effects of Feedback Feedback Neutralization Dual-Microphone Reference Sensing System Other Acoustic Arrangements

54. 3. Applications Of Active Noise Control active noise control FAQ, Version 200102-27. 3. Applications of active noise control. 3.1 What are some typical applications for active noise control? http://users.erols.com/ruckman/Applications.htm

Active Noise Control FAQ Version 2001-02-27 3. Applications of Active Noise Control 3.1 What are some typical applications for active noise control? The most successful demonstrations of active control have been for controlling noise in enclosed spaces such as ducts, vehicle cabins, exhaust pipes, and headphones. Note, however, that most demonstrations have not yet made the transition into successful commercial products. Another application that has seen some commercial success is active mufflers for industrial engine exhaust stacks. Active control mufflers have seen years of service on commercial compressors, generators, and so forth. As unit prices for active automobile mufflers have fallen in recent years, several automobile manufacturers are now considering active mufflers for future production cars. However, if you ask your local new car dealer about the active muffler option on their latest model, you will likely receive a blank stare: no production automobiles feature active mufflers as of this writing. Large industrial fans have also benefited from active control. Speakers placed around the fan intake or outlet not only reduce low-frequency noise downstream and/or upstream, but they also improve efficiency to such an extent that they pay for themselves within a year or two.

55. Active Noise Control Charles Birdsong. My graduate work at Michigan State University was related to active noise control. Statistical Energy Analysis. http://www.calpoly.edu/~cbirdson/active_noise_control.htm

Charles Birdsong My graduate work at Michigan State University was related to active noise control. Statistical Energy Analysis Compensated Acoustic Actuator Development Acoustic Measurements and Analysis Modeling of acoustic systems (acoustic ducts) Feedback control of acoustic duct systems See the video from the MSU Dynamic Systems Lab related to my Ph.D. ( video demo 55Mb Development of a hybrid analog/digital controller for acoustic control applications

56. Noise Books Understanding active noise control by CH.Hansen (2001) AZ, FB , BN, AZUK, BS. active noise control Primer by SD.Snyder (2000) AZ, FB , BN, AZUK, BS. http://www.science-books.net/noise.htm

Noise Books by science-books.net and acoustics.eu.com This web page links in with an internet book shops USA: Amazon (AZ), Barnes and Noble (BN), Fatbrain (FB) UK: Book Shop (BS) Amazon UK (AZUK) and allows the direct purchase of selected books. Simply Click on AZ, BN, AZUK or BS to find further information or purchase the book. Understanding Active Noise Control by C.H.Hansen (2001) AZ FB BN AZUK ... BS Handbook of Industrial Noise Control by G.Orr (2001) AZ FB BN AZUK ... BS SAE Handbook: Materials, Fuels, Emissions and Noise/ Parts and Components/ On-Highway Vehicles and Off-Highway Machinery by SAE (2001) AZ FB BN AZUK ... BS Noise Abatement by C.A.Davis (2001) AZ FB BN AZUK ... BS Controlling Radiated Emissions by Design by M.Mardiguian (2000) AZ FB BN AZUK ... BS Active Noise Control Primer by S.D.Snyder (2000) AZ FB BN AZUK ... BS Noise and Vibration by SAE (2000) AZ FB BN AZUK ... BS Noise Control Manual for Residential Buildings by C.Harris (1999) AZ FB BN AZUK ... BS Active Noise Suppression by G.Rosenhouse (1999) AZ FB BN AZUK ... BS Actice Noise Control: Fundamentals for Acoustic Design by G.Rosenhouse (1999) AZ FB BN AZUK ... Signal Processing for Active Control by S.Elliot and R.C.Green (1999)

57. Ingenta: Article Summary -- Multi-channel Active Noise Control For Periodic Sour Multichannel active noise control for periodic sources-indirect approach Automatica February 2004, vol. 40, no. 2, pp. 203-212(10 http://www.ingenta.com/isis/searching/ExpandTOC/ingenta?issue=pubinfobike://els/

58. Details For Active Noise Control active noise control Technologies and Design Concepts in Engineering and Nature Rosenhouse, G. £175.00 1853125687 Add to Basket, Volume number Vol 2. http://www.bmjbookshop.com/shop/product_display.asp?productid=1853125687&product

59. Details For Active Noise Control active noise control Technologies and Design Concepts in Engineering and Nature, Rosenhouse, G. £175.00. 1853125687, Volume number Vol 2. Publisher WIT Press. http://www.bmjbookshop.com/shop/Product_Display.asp?SiteLanguage=ENG&ProductId=1

60. AOL Canada Search: Search Results Main Science Technology Acoustics, Ultrasound and Vibration active noise control Sponsored Links SubCategories In active noise control http://search.aol.ca/cat.adp?id=48634&layer=&from=subcats

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