Geometry.Net - Science: Active Noise Control

Lord Corporation - Leaders In Shock, Vibration, Noise & Motion Control
Products from a manufacturer of active noise and vibration control systems for passenger aircraft.Category Science Technology active noise control devices and systems to manage mechanical motion and control noise, and products modificationshops turn to hightech passive and active noise-reduction systems
http://www.lordcorp.com/

Extractions: Lord Corporation designs, formulates, manufactures and markets adhesives, polyurethane coatings, electronic adhesives and coatings; devices and systems to manage mechanical motion and control noise, and products and systems utilizing magnetically-responsive (MR) technology. For a fact sheet on Lord Corporation, click here Solutions for a World in Motion NEWS... Balancing Big Fans
Active Noise Control FAQ
Provides answers to common questions about active noise control including a discussion of popular Category Science Technology active noise control active noise control FAQ. The FAQ you are now reading discusses active noise control,a novel way of using basic physics to control noise and/or vibration.
http://users.erols.com/ruckman/ancfaq.htm

Extractions: What is an FAQ, you say? It's a "Frequently Asked Questions list." The Internet supports thousands of "newsgroups" discussion forums covering every imaginable topic. When certain questions tend to get asked over and over again, it's common to assemble the answers into a list for easy reference.
Active Noise Control
Corporation defines this method of assuaging noise pollution, offering a FAQ, news, organizations and links. Locate product information. active noise control quiets offensive noise by using cancellation techniques, or antisound.
http://www.signalsystemscorp.com/ancindex.htm

Extractions: Active Noise Control quiets offensive noise by using cancellation techniques, or anti-sound. Signal Systems Corporation's mission is to help quiet irritating noises so you can have a more peaceful life. This web site is designed to give the active noise community a common source for information about this technology, its applications and suppliers. Please use the feedback link at the bottom of each page to let us know how we can improve this site. What is active noise control? Check out the ANC FAQ Where is active noise control technology going ? Read our discussion about commercializing ANC technology Feedback
Redirection
University of Adelaide. Active noise and vibration control group. Current research projects and publications.
http://www.mecheng.adelaide.edu.au/anvc/home.html
NVHmaterials.com - Links Database
active noise control FAQ FAQ's, references, and links to other sites involved with active noise control pop (Added 11-Jun-2000
http://www.nvhmaterials.com/nvh/Active_Noise_Control

Extractions: Top : Active Noise Control Home Add a Resource Modify a Resource What's New ... Search Active Noise Control FAQ - FAQ's, references, and links to other sites involved with active noise control pop (Added: 11-Jun-2000 Hits: 292 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: 225 Rating: 2.00 Votes: 1) Rate It pop (Added: 8-Jun-2000 Hits: 252 Rating: Votes: 0) 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: 80 Rating: Votes: 0) Rate It DEICON Dynamics and Control - DEICON designs and prototypes custom active noise and vibration solutions. (Added: 27-Aug-2000 Hits: 88 Rating: Votes: 0) Rate It NCT Group Inc.
Active Noise Control
active noise control One of the less desirable aspects of modern technology has been the generation of unwanted noise.
http://www.me.berkeley.edu/active_noise_control.html

Extractions: One of the less desirable aspects of modern technology has been the generation of unwanted noise. Noise can be produced by manufacturing machinery, from air and fluid flows, from vibrations transmitted within structures, etc. This noise can reduce an individual's ability to receive acoustic information and induce listening fatigue and/or permanent hearing damage. At Berkeley, researchers are focusing on active means to ameliorate the problems of unwanted noise. Active Noise Control Laboratory K. Hedrick A. Packard B. Tongue Professors Packard, Hedrick, and Tongue (from left to right) examine the experimental sound box used to test methods for reducing noise. Latest update: June 18, 1996
Soundproofing Noise Control Bosco Italia S.p.A. Industrial Sound-proofing
Plans, builds and implements noise reduction and active noise control systems.
http://www.sound-proofing.net
3. Applications Of Active Noise Control
active noise control FAQ, Version 200102-27. 3. Applications of Active NoiseControl. 3.1 What are some typical applications for active noise control?
http://users.erols.com/ruckman/Applications.htm

Extractions: 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.
Industrial-enclosure, Electronic Boxes, Plastic Boxes Richard Wöhr GmbH
Bosco Italia S.p.A plans, builds and implements noise reduction and active noise control systems
http://www.industrial-enclosures.com

Extractions: STANDARD OR CUSTOMIZED VERSIONS To make it easier for you to find the type of enclosure you are looking for with our great variety of industrial enclosures, we have put together the enclosures in groups according to their usage. Via the buttons on the left you get directly to the respective index pages. In case you dont find the desired industrial enclosure, please just send us an email, our range of products is stretched constantly. New product lines: Enclosure line ISAG Profile enclosure line PRIOLINE We can deliver more than 500 different types of enclosures Are you looking for additional products and services all around your enclosures? In co-operation with other companies, we have put together www.Gehaeuse.info where you will find virtually everything on enclosures: Input systems, foil keyboards, front panels, stainless steel keyboards ...
Dynamic Directory - Science - Technology - Acoustics, Ultrasound And Vibration -
for using smart materials in active noise control. active noise control and noise cancellation solutions for acoustic
http://www.maximumedge.com/cgi/dir/index.cgi/Science/Technology/Acoustics%2C_Ult

Extractions: 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. 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.
Active Noise Control Status
active noise control works but where is it going? Larry Riddle. Through education,engineers can be trained in the use of active noise control.
http://www.signalsystemscorp.com/anc_status.htm

Extractions: ANC Organizations Active noise control works - but where is it going? Larry Riddle Many people have heard of active noise control, but with the exception of headphones, few people have experienced its benefits. Why has this happened? The short answer is cost. Unlike over-hyped technologies, active noise control works. The obstacle has been to make active noise control a cost-effective solution to noise problems. This obstacle has been far more difficult than many people expected. When a technology is more expensive than its benefits are generally worth, only a small market exists for the technology. Now, new technologies are usually expensive to start out. Early users of a technology pay a higher price for being first, with a competitive advantage as the benefit. Technology developers gain valuable experience working with early customers. This experience and know-how yields product improvements that provide more economical solutions for future customers. In this way, the technology spirals into wider and wider use, as the cost for implementation falls. So, what happened to active noise control? Why don't we see active noise control technology in our daily lives? The answer lies in the fact that most consumers are reluctant to pay more than 100 to 2000 dollars for noise reduction solutions. This cost range has been difficult to achieve with effective active solutions. The notable exceptions are noise canceling headphones and some dishwashers.
Browsing Science Technology Acoustics, Ultrasound And Vibration Active Noise Con
for using smart materials in active noise control. active noise control and noise cancellation solutions for acoustic
http://www.uksprite.com/search/search/Science/Technology/Acoustics%2C_Ultrasound

Extractions: WebSearch Low-cost advertising at UKSprite Join Login @UK.Sprite Home Latest Headlines UK Weather World Weather ... UK Travel Guide Fun TV Guide Lotto e-Greetings Mobile Fun Communicate Email Login Get Free Email Free Text Messages Lifestyle Horoscopes Dating Recipes Health Shop DVD's Books Videos More... Deals Auctions Classified Ads Site Map
Active Control
active noise control Active Control eXperts Active Control eXperts (ACX) is a rapidly growing product design and manufacturing company specializing in applying smart materials, such as piezoelectrics, and active control technology. EZANC, from Causal Systems, makes active noise control accessible to engineers, researchers, consultants, and
http://www.ecgcorp.com/velav/vldocs/active.html
NVHmaterials.com - Links Database
19 Cool Links active noise control The Active Noise Vibration ControlGroup pop (Added 8Jun-2000 Hits 252 Rating 0 Votes 0) Rate It.
http://www.nvhmaterials.com/nvh/Cool/
Active Noise Control, The System With More Error Sensors And Sources
Content. active noise control, the system with more error sensors and sources.Miroslav Luke¹ 1. 22 November 2001. active noise control, how does it work?
http://www.electronicsletters.com/papers/2002/0004/paper.asp

Extractions: the system with more error sensors and sources Miroslav Luke¹ 22 November 2001 This paper deals with the expansion of active noise control systems into a three-dimensional domain. More then one error microphone and speaker is used in order to eliminate an ''unwanted'' disturbance. Three algorithms are described. Multiple Error Least Mean Squares (ME-LMS) algorithm is based upon the minimizing of the mean value of all squares of error signals. Minimax algorithm does almost the same except for not minimizing all squares but only the maximal square of an error signal. Complex Sign Algorithm (CSA) is algorithm in which an error signal is normalized for its absolute value so that a recursion is driven by the sign of an error signal. Simulation of these three algorithms are proved in Matlab. In recent years a classical noise protectors have been complemented with new systems called active noise control system. Active noise control systems are suitable for lower frequencies and classical mechanical noise protectors are used for higher frequencies. So, these two systems, the old and the new one, functioning together can cover very wide frequency band beginning almost at Hz. Active noise control, how does it work? This question may be simply answered by following sentence. An active noise control system measures an input acoustic signal and on the base of this measurement creates another acoustic signal, which is able to cancel the unwanted part of the input signal in the sum of these two acoustic signals.
Siemens VDO Automotive AG
press Vienna, 25 April 2002 Music under the hood active noise control from SiemensVDO Exploits the Latest Findings of Psychoacoustics Research In extensive
http://www.siemensvdo.com/news/2002/04002e.htm

Extractions: In extensive tests, Siemens VDO Automotive has proved that an active control of the engine sound significantly influences the driver's feeling of well-being. At the 23rd International Vienna Motor Symposium, the automotive electronics supplier is showing how selective sound design is made possible with Active Noise Control. What sounds put the motorist to sleep? What sequences of tones increase a person's feeling of well-being? These are typical questions for psychoacoustics, a relatively new scientific discipline whose findings are increasingly falling on open ears in automobile development. Fundamental studies have shown, for example, that a low but constant sound level is by no means always regarded positively. In fact motorists make similarly high demands on the sound of a good engine as they do when listening to a symphony: Harmonious sequences of tones are particularly popular. But since even the most perfect mechanical design of an engine cannot always rule out dissonance, Siemens VDO has developed a technology that allows the engine sound to be actively influenced - at its source. With Active Noise Control (ANC), the opposing noise is generated by a loudspeaker installed in the air intake system. Here the engineers at Siemens VDO utilize the physical phenomenon of interference: When two waves meet, their amplitudes are superimposed on one another. If these waves are sound waves, a new tone is generated with a different volume. In extreme cases, the waves cancel one another out completely - and there is silence.
Innovation News Novemeber 2002
Engineers at Siemens VDO Automotive have come up with active noise control (ANC),a patented technology that allows engine sounds to be actively influenced at
http://w4.siemens.de/en2/html/press/innovation_news/2002/ie_11_02.html
Active Noise Control FAQ V1996-03-14
active noise control FAQ v199603-14. This FAQ has four purposes * Provide concise,accurate answers to common questions about active noise control.
http://isc.faqs.org/faqs/active-noise-control-faq/

Extractions: From: ruckman@xis.com (Dr. Chris Ruckman) Newsgroups: alt.sci.physics.acoustics comp.dsp alt.answers comp.answers ... news.answers Subject: Active Noise Control FAQ v1996-03-14 Followup-To: alt.sci.physics.acoustics 4iail7$jse@news2.cais.com ruckman@xis.com (Dr. Chris Ruckman) Summary: This FAQ describes active noise control, a novel method for controlling unwanted sound and vibration. X-Newsreader: News Xpress 2.0 Beta #0 Keyword: active control, noise, vibration, sound, anti-noise, cancellation, FAQ Archive-name: active-noise-control-faq Posting-Frequency: monthly Last-modified: 1996/02/22 Version: 1996-03-14 - Frequently Asked Questions: Active noise control - SUMMARY: The FAQ you are now reading discusses active noise control, a novel way of using basic physics to control noise and/or vibration. What is an FAQ, you say? Well, the Internet supports thousands of "newsgroups" discussion forums covering every imaginable topic. An FAQ (Frequently Asked Questions list) is a summary written to answer specific questions that arise repeatedly in the newsgroups. This particular FAQ was written for the newsgroups news:alt.sci.physics.acoustics
Publications On Active Noise And Vibration Control -- Scott C. Douglas
active noise control, and its cousin, active vibration control, attempt to cancelan unwanted ``noise'' acoustical wave by injecting an equalbut-opposite
http://engr.smu.edu/~douglas/pubanvc.html

Extractions: 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
Institute Of Noise Control Engineering USA
One hundred and sixtyfive papers on all aspects of noise control engineering, includingair-moving device noise control, active noise control, and European
http://www.inceusa.org/pronatlconf.asp

Extractions: The NOISE-CON Series of conferences on Noise Control Engineering have been held in the United States since 1973. The conferences were held in the odd-numbered years until 1987. Beginning with NOISE-CON 88, the conferences will be held every two years out of three. The next NOISE-CON conference is scheduled for 1997. All of the Proceedings in the NOISE-CON Series are available for immediate shipment except the NOISE- CON 79 Proceedings. An order form and price list are located here

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