If you play white noise to a group of people and tell them that the song “White Christmas” is hidden in the sound, about 30% of them will be convinced that they can hear it. The human mind is always looking for patterns – even when they aren’t there. This propensity explains a significant proportion of complaints where noise levels are actually very low (they can be close to, or below, the threshold of hearing at low frequencies) or the complainant has mild tinnitus. The imagined pattern may be triggered by low level noise that isn’t itself the real cause of the subjective “nuisance”. Based on this understanding, we have developed an innovative solution based on “psychological silencing”. This involves broadcasting a carefully designed noise signature (matched both to the existing background and to the disturbing sound) from a bespoke sound system installed at the “culprit” site. This destroys any character in the sound and, coupled with an explanation and demonstration to the complainant as to how the “pattern” has been removed, they no longer hear it. Et – voila! No more complaints.
- Industrial Noise and Vibration Centre
- Satisfying super-sensitive complainants with psychological ...
Experiences in development and maintenance of Silence-GIS
Abstract Silence-GIS is a larse scale noise management system build as an extension on ArcGIS 9.3.1. This system has been designed and developed for the Dutch Highway Authorities. The aim of the system is to support decisions on Dutch and European noise policy and to predict the effect of future measures on the noise exposure of the population in The Netherlands. The information needed to perform noise calculations was divided over different departments. There was a great need for standardization and integration...
How to manage Silence? A large scale noise management system
AbstractSilence is the main noise management system for the Dutch highways and is used by the Dutch Ministry of Transport. The Silence system comprises IT infrastructure, environmental data, noise management software, an organisation, procedures and maintenance. Typical noise management system tasks involve data management, setup noise management software, software customisation, performing calculations and analyses and a proper maintenance cycle. In 2010 the new noise management system will become available and...
The Silence of the Lambs – Invictus Case Study
The sound of new-born lambs bleating is something that most people would be happy to wake up to on a Spring morning – or perhaps not? Noise consultant Louise Alderson, had the unusual assignment of monitoring noise levels from baby lambs and their mothers on a farm in Cumbria following a planning application to build a housing development on nearby fields – owned by the same farmer. Environmental Health Officers (EHO) from the Local Authority had raised concerns that noise from the annual spring...
Record breaking formula one fan noise control
Problem: an extract system fan drone creating a potential environmental noise problem. Solution: aerodynamic engineering instead of silencers – in keeping with the Red Bull Technology ethos. The conventional technique used to reduce fan tones like this is a silencer – a large, palliative silencer that doesn’t tackle the source of the problem. Not only can these reduce the system efficiency, but they may also require additional lagging and regular cleaning to maintain performance. Moreover,...
Poly(propyleneimine) dendrimers as potential siRNA delivery nanocarrier: from structure to function
The goal of the present investigation is to reveal the role of the Poly(propyleneimine) (PPI) dendrimer structure on the siRNA nanoparticles formation, facilitation of cell internalisation, and sequence specific knockdown of targeted genes. It was found that the higher generations of PPI dendrimers (G4 and G5) most effectively initiated the complexation of siRNA into discrete nanoparticles when compared with lower generations of dendrimers (G2 and G3) as determined by tapping mode atomic force microscopy and...