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Leonardo da Vinci
"ANVC" 1452–1519
Leonardo da Vinci is history's foremost Renaissance man, a master of both art and science. Da Vinci is best known as the artist who created such masterpieces as the Mona Lisa, Madonna of the Rocks, and The Last Supper. Yet he was also a brilliant scientist, architect, engineer, and inventor. In fact, he was one of the best scientific minds of the Renaissance period, carrying out sophisticated research in fields ranging from architecture and civil engineering to astronomy and anatomy. The dynamics of water and the study of hydraulics were prominent among his many interests. He described how water in two canals can "cancel each other" when they meet, given that the timing (phase) is correct.
ANVC mid 1850's – Ships
Stokes performed observations in 1868 and J.W. Strutt (Lord Rayleigh) followed some years later. In 1878 S.P. Thompson made the first known real attempt and not long after, Thorncraft and Yarrow investigated how a ship’s “rolling” could be compensated for using active means. Photo, courtesy of Malcolm Cooper.
ANVC 1954 – Headset
Olsen and May present a solution to accomplish active noise control in an headset.
ANVC 1956 – Transformer
An early analog design from 1953 where a person is adjusting amplitude and phase and thus being able to cancel the distyrbing sounds from the transformer (tonal noise). Today, the same principle is often used but a microprocessor is performing the "automatic tuning."
ANVC 1980 – Sound Selection
Already in 1980, Dr. Thomas Lagö and Dr. Per Eriksson performed demonstrations of ANVC techniques. Rock music and classical music were mixed and the listener could state which one was "music." The other one would be removed and only the "correct music" would be plaid. The system created substantial interest.
ANVC 1986 – Chaplin Patent
Chaplin in England presents his patent on noise cancellation for headsets.
Some ANVC Companies abt 1990
Signal Control AB, Sweden (1988-2002)
NCT, Noise Cancellation Technologies, USA (1987), revamped end of 1990's.
ANVT, Active Noise and Vibration Technologies, USA (1987-1991)
TechnoFirst, France (1990)
Elesa, Italy (abt 1994)
Digisonix, USA (), revamped 2001
ANVC 1992 – Active Control AB
The foundation of Active Control AB in Sweden by Dr. Thomas Lagö and Sven Olsson. All active business in Signal Control is moved to Active Control AB. Active Contril was wholly owned by Signal Control AB. Signal Control was founded by Sven Olsson and Per Eriksson.
ANVC 1992 – Nissan Bluebird
Nissan introduces active noise control in cars, but only in Japan. Lotus in England and the Chaplin patent could have created challenges at the time but not in Japan.
ANVC 1994 – Peltor ANC
Peltor AB in Sweden, owned by Aearo in the USA, is one of the world leaders in safety and hearing protection equipment. They have worked with ANC methods since end of 1980's. Picture courtesy of Peltor AB (this headset does not contain ANC).
ANVC 1994 – Cabin Noise
Eleasa and Magneti Marelli designed a cabin noise system for cars. It was predicted tyo go into volume manufacturing. Active Control had a close cooperation with ANVT and Eleasa and Dr. Thomas Lagö was the European Marketing Manager for ANVT.
ANVC 1995 – ASANCA II
ASANCA, Advanced Studies on Active Noise Control in Aircraft was a European community project aiming at multiple new techniques to solve interior aircraft noise challenges. BTH developed sensor and actuator optimization methods that outperformed previous methods used. The ANVC control system proved extremely efficient with a very low cost implementation factor. This has been a core technology at BTH -- efficient and cost effective implementations without sacrifizing performance.
ANVC 1996 Sports Equipment
AcX in the USA approached multiple companies in the sport's industry and an "active technology" was embedded into skiis, baseball bats, mountain bikes etc. This technology was not really "active" but using "passive" damping via electronic units. In several cases the marketing effect was larger than the physial effect.
ANVC 1998 – Cameras
The vibration stabilization technique is today a commodity for cameras of all sizes and price ranges. The technology exist both as a physical stabilization and an off-line sensor/picture "stabilization" using signal processing (filtering). Dr. Tetsuo Yoshida was an early inventor of this technology at NEC-Tokin.
ANVC 1998 – Quiet Power
The american company Quiet Power, a spin-off from NCT founded in 1997, has developed and installed a system to defeat line frequencies from transformers. A system installation is made in Sweden and BTH with Dr. Thomas Lagö as project manager was responsible for the compliance and performance evaluation of the system installation.
ANVC 1999 – Metal Cutting Breakthrough
Dr. Lars Håkansson presents his doctor's degree covering active vibration control of machine chatter vibrations. The thesis work was groundbreaking and his supervisor professor Ingvar Claesson can be very proud. This important work created the basis for the awarded Acticut technology. Professor Ingvar Claesson was the project manager.
ANVC 2000 – BOSE QuietComfort®
In 2000, BOSE introduced QuietComfort® Acoustic Noise Cancelling headphones—their first noise reduction headphones designed specifically for airline passengers. Today, there are a multitude of companies delivering noise canceling headsets and the prices are often rather low. Picture courtesy of Bose.
ANVC 2003 – Acticut AB is launched
Acticut AB has bought Active Control AB and all of its assets. The key persons involved from BTH are being "transfered" in this buyout. Acticut International AB is made the holding company of Acticut AB and Axiom Edutech AB.
ANVC 2005 – Cabin Noise
Honda releases the minivan Odyssey with active noise reduction. Picture courtesy of Honda.
ANVC 2006 – Acticut® Award
Acticut AB receives the prestigious MinSTa award for its smart and embedded active vibration control system.
ANVC 2007 – Acticut® ATD
In 2007, Acticut launched a series of Adaptive Tuned Dampers for use in multiple applications. Multiple projects using tuned dampers has been successfully completed by the BTH/Acticut team (Signal Control/Active Control).
NVC 2007 – Ventilation Noise
BTH releases a a new ANC silencer approach for ventilation systems. The approach using active noise control enables a non-bulky solution to low frequency ventilation noise problems. The module design is suitable for active noise control. Dr.Lars Håkanssonn was the project manager at BTH.
Contact the leading expert team on ANVC methods. We have been involved in this business for 25+ years and our expert team has vast international experience from a multitude of applications and can help you with product optimization, development, products, projects etc. We understand passive/active optimization and low cost but effective solutions. We believe that the above history proves this statement. |
ANVC – Basic Principle
A wave 180 degree out of phase and with the proper amplitude added to the first wave, will cancel the first wave. This is an easy explanation but actually an impedance model should be used to enable full explanation on how an ANVC system is working.
ANVC 1930 – 1953
Below, some early patents are depicted.
ANVC 1977 – CERN
In 1977, a team at CERN in Geneva, Switzerland worked on the stabilization of the high-energy acceleration system, the PS Booster. A small team developed an analog active damping system, using a modal control approach. The performance of this system led to a Nobel prize.
ANVC 1987 – Öhlins
Öhlins shock absorbers are an integral part of motorsport history. Past, present and future. Today, the company enjoys a major market presence in terms of high performance and top quality suspension products for motorcycles, cars, four-wheels and snowmobiles.
Between 1987 and 2007, Öhlins Racing has been majority-owned by the Yamaha Motor Company, though it continues to operate as a dynamic, independent company within the business group, but since December 2007 Kenth Öhlin owns 95% of the shares. Over 90% of the company's turnover is accounted for by the export market, equally divided between original manufacturers and aftermarket sales. Included among Öhlins biggest OEM customers are Yamaha, Ducati, Aprilia and BMW.
ANVC 1991 – The NoiseMaster Headset
French company TechnoFirst releases their first generation ANR headsets, the NoiseMaster.
ANVC 1992 – The first dedicated Active Control Conference
Professor Chris Fuller arranges the First International Conference on Recent Advances in Active Control of Sound and Vibration in Blacksburg Virginia, USA. Professor Fuller's work in this field is substantial. Dr. Burdisso was the Technical Chairman. Picture courtesy of Virginia Tech. Dr. Thomas Lagö is an adjunct professor at Virginina Tech in professor Fuller's group.
ANVC 1994 – ANVT NQ100®
ANVT in the USA releases a series of comfortable and efficient headsets with ANR (Active Noise Reduction). Active Control sells the units in Scandinavia. Sweish investment team Investor International had investeted in ANVT and its company future.
ANVC 1994 – SAAB Aircraft
SAAB Aircraft introduces active noise control in their SAAB 340B models as a retrofit. Later, SAAB 2000 is using ANC as a standard outfit. Urban Emborg was responsible from SAAB and Colin Ross from NCT, a business unit that later was sold to Ultra Electronics. Picture courtesy of SAAB Aircraft.
ANVC 1995 – Ventilation System
French company TechnoFirst introduces Active FLow-through silencer technology for HVAC systems, ActA. Picture courtesy of TechnoFirst.
ANVC 1995 – Speech Enhancement
An in-line cancellation method that is capable to automatically suppress background noise in a cell phone has been developed. The core team at BTH, with professor Ingvar Claesson as the main inventor, has developed this advanced methodology. Sony/Ericsson has exclusive rights to this patented methodology for cell phone applications (a large set of patents). The technology has been implemented in more than 200 million phones.
ANVC 1997 – High Speed Train
A system suppressing the sleeper frequency induced into the bogie of a high-speed train car was developed. ADtranz and some other Swedish partners were involved. A substantial suppression of the vibrations was accomplished via the four inertial mass shakers mounted in the bogie. The project was awarded Best Poster/Paper at the Vehicle Dynamics conference in South Africa. Dr. Thomas Lagö was the project manager at BTH.
ANVC 1998 – Helmet ANC
An advanced hearing protection system was developed by BTH. The system combined two ANC methods but also added speech intelligibility enhancement. The combination of these three methods solved the challenging situation creating NIHL (Noise Induced Hearing Loss) for helicopter pilots in Sweden. Dr. Thomas Lagö was the project manager.
ANVC 1998 – KKS Profile Funding
BTH was awarded the prestigious KKS Profile Funding with a 10 million USD support over 7 years, with half of the funding from industry. The program received excellent judgement and is so far the best profile funding according to KKS and the evaluators. Dr. Thomas Lagö was the chairman of the profile. After he left for the USA, professor Ingvar Claesson became the chairman. See this link for more information.
ANVC 1999 – AVIIS
BTH developed an active vibrationm isolation system with applicability to luxury yachts. Volvo Penta and Trelleborg was involved in the project and a Storebro yacht was bought for use in the project. The focus was the cabin noise suppression. Dr. Thomas Lagö was the project manager.
ANVC 2002 – Cabin Noise
BTH releases a cabin noise system for fork lifts. The system was developed together with Kalmar Industries and was initially a part of a Master Thesis project. Dr.Lars Hå[kanssonn was the project manager at BTH.
ANVC 2004 – Acticut is launched
The Acticut system is launched in the market by Acticut AB. The system has been developed over a period of almost 10 years by key researchers at Blekinge Institute of Technology. The system has been awarded multiple patents. The key inventors are Dr. Lars Håkansson, Dr. Thomas Lagö and Dr. Ingvar Claesson.
ANVC 2005 – Acticut® Award
Acticut AB receives the award as the Springboard Company of the Year. The award is given the new companies showing clear and raoid growth. The award was presented by Connect Halland and the county governor of Halland Lars-Erik Lövdén delivered the award (to the left in the picture).
ANVC 2007 – Machine Vibrations
Acticut AB received its new lathe to headquarters in Falkenberg. The Okuma lathe is mainly being used for production testing and demonstrations. At BTH, a Mazak lathe is being used, mainly for R&D but also for demonstrations.
ANVC 2008 – The Aircraft Landed!
The aircraft has landed in Falkenberg. A real fuselage has been acquired where ANVC development and demonstrations can take place. An advanced computer controlled loudspeaker ring can simulate the propeller engines and thus create a "real life" sound experience inside the aircraft. This project has been accomplished together with Blekinge Institute of Technology, BTH.
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