Active Noise Control

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Active Noise Control

The use of energy-consumptive systems to reduce “white” noise by applying specific algorithms and computer-controlled digital processors, to generate sounds opposite that of the undesired noise(s), effectively cancelling their effects.
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Based on the principle of "anti-noise", RNC uses accelerometers placed strategically along the path of noise transfer to provide a reference signal to generate an anti-noise sound wave that is output through the vehicle s standard audio system, thereby creating a more quiet and comfortable cabin.
This new anti-noise initiative dovetails with its existing programmes to monitor air quality across the emirate.
But anti-noise campaigners also warned that exposure to high-volume situations could cause health problems and even premature death.
Mr Jones said concerns expressed had been addressed in his revised plans and he would plant more trees and extend an anti-noise wall.
It was further alleged that the music raged on as soon as the police and Camden Council anti-noise patrols were gone.
In January the Birmingham Airport anti-Noise Group and Friends of the Earth launched the Flyagra campaign and website to persuade the council to turn down the airport's application for planning permission.
Airport chiefs hope to complete the longer runway in time for the 2012 Olympic Games, but face opposition from green campaigners, such as Friends of the Earth and Birmingham Anti-Noise Group.
It will give directions on navigation, engaging the enemy and have an anti-noise gadget to let airmen cope with the 1,500mph din.
Target markets for this product include vibration absorption segments for rail transportation, anti-noise paving tiles, sports surfaces, playground surfaces and panels for railway crossings.
However, the National Noise Association (an umbrella organisation for several anti-noise protest groups) even uses the upbeat slogan that this is "The Year of the National Noise Strategy", which probably won't get many pulses racing.
And an anti-noise team from the city council moved in to confiscate two hi-fis and amplifiers, as well as 50 CDs.
The low-noise sensor is made of ETFE (ethylene-tetrafluorethylene) or PVDF (polyvinylidene fluoride) with patented anti-noise shielding and is robust under exposure to various chemicals and varying temperatures.