+44 (0) 1923 729126
The Mansion, Building Research Establishment, Bucknalls Lane, Watford, Hertfordshire, WD25 9XX, United Kingdom

NoiseTrap®
Active

To expand our range our innovative acoustic technologies, we have set ourselves upon creation of a revolutionary active noise control system, for industrial applications. 

Active noise cancellation technology works on a different basis

Unlike passive approach provided by noise panels, active noise cancellation technology works on a different basis. The idea behind it is to measure the noise spectrum with applicable sensors and create in real time by means of advanced algorithms, a counter wave that is generated from an anti-noise speaker located in the vicinity of noise source.




Active noise cancellation systems

Active noise cancellation systems can be particularly effective at low frequencies where the wavelength of sound is in the range of meters and other solutions tend to become over-engineered or fail to deliver enough efficiency for noise level reduction.

The advantages are that the speakers and measurement sensors do not obstruct the air pathway of for e.g. HVAC duct or louvres outlets. Active systems can adapt dynamically to changes in noise signal and follow them accordingly providing robust solution for blocking excessive noise.

Applications include:

  • Power and distribution transformers
  • Compressors
  • Low frequency machines

Achieving effective Active Noise Reduction

A transformer station owned by Westland Infra Netbeheer in the Dutch town of Poeldijk has been fitted with an Active Noise Reduction (ANR) system. This makes use of a technology, which is also known as anti-noise. There were plans to build new houses close to the transformer station so the transformer station had to meet certain noise requirements. Merford was asked to find a way to reduce the noise pollution levels to a maximum of 40 dB, at a distance of 21 metres on the side of the station where the houses were to be built. An ANR solution was developed to be installed in the transformer station so the sound emissions were reduced to the required levels.

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