Nanyang Technological University, Singapore (NTU Singapore) researchers have developed a device that can reduce noise pollution entering buildings even while windows are wide open.
Designed to be mounted onto window grilles, the device could reduce up to 50 per cent of noise coming from nearby environments such as busy roads, train tracks or from construction activities.
The device uses ‘active noise control’ technology – found in many high-end headphones that cancels external noise – that is adapted to work in a large open area.
The benefits are two-fold: windows can be left open for fresh air without disturbance from external noise pollution and reducing the need for air-conditioning to keep the interiors of buildings and homes cool.
Professor Gan Woon Seng, Director for NTU’s Centre for Infocomm Technology (INFINITUS), who led the research said, “Compared to noise cancellation headphones, what we have achieved is far more technically challenging as we needed to control the noise in a large open area, instead of just around the ear.
This noise cancellation technology is an example of research innovations that NTU is encouraging under its Smart Campus initiative, which aims to improve quality of life for society through the development of new sustainable and technological solutions and by trialling them on its campus first.
Using sound to remove noise
Currently at the prototype stage, the device uses 8 watts of power, similar to a small portable Bluetooth speaker. Several units are placed together to form a grid-like array on a window grille to reduce external noise.
The device uses a special sound emitting mechanism which works like a speaker and is hooked up to a processing unit. Equipped with a microphone, it can detect noise even before it reaches the window and computes the attributes of the incoming noise in real-time.
It quickly emits a countering sound or “anti-noise” that has the same waveform characteristics of the invading noise but with one difference: it is inverted or “flipped”.
When both outside noise and anti-noise converge, they cancel each other out, resulting in a softer ambient sound entering living spaces.
“Our innovation not only computes the right amount and type of “anti-noise” to emit, but also does it faster than the detected noise can reach inside the building,” explained Prof Gan, who teaches at NTU’s School of Electrical & Electronic Engineering.
The research team conducted the tests using a soundproof chamber at the university’s labs that houses a mock room with windows and doors, resembling a typical room in a home. Various recorded sounds from construction sites, jet engines and trains were used as noise sources during the tests.
They are now developing the technology further by improving its noise cancellation efficiency, making them smaller, and more cost-effective to produce.
Prof Gan said, “We are currently finding ways to improve the technology further so that it can be used not only at window grilles with large openings, but also provide a cost-effective solution that can be easily installed and replaced. Ultimately, we aim to integrate this technology into window grilles that can help mitigate urban noise pollution conveniently.”
The researchers are also working with government agencies in Singapore to further improve the technology to make it viable for commercial and residential applications.
The Latest on: Active noise control technology
via Google News
The Latest on: Active noise control technology
- Genesis Details 2020 G90 Ahead Of November 27th Unveiling on November 12, 2018 at 9:02 am
Technologies that will make your life easier Sticking with the technology theme ... The car will also have an Adaptive Control Suspension and an Active Noise Control system. The latter cancels out off... […]
- Review: Bolt wireless earphones let you rock on your own, or share with friends on November 12, 2018 at 8:28 am
A number of Phiaton's earphones have landed on our review bench over the years – including carbon fiber-packing fashionistas, active noise cancelers and travel-friendly wireless hipsters. […]
- Listen up: Why Microsoft's Surface Headphones are a big deal on November 9, 2018 at 3:42 am
The left cam turns like a dial to adjust the noise reduction, the right rotates to control volume. The left cam turns like ... something I've noticed with other active noise-cancellation systems. When ... […]
- Lynxsonic wireless active noise cancelling headphones on November 8, 2018 at 2:09 am
Offering advanced wireless charging, full touch control, 36dB Active Noise Cancelling and ... sure that you are ahead of everyone else.” “Especially our active noise cancelling technology will block a... […]
- Sony WH-1000XM3 Wireless Noise Cancelling Headphones Review: The peak wireless experience on November 6, 2018 at 7:57 pm
With this, Sony promises better audio performance, alongside already excellent active noise cancellation ... There are physical buttons for the noise cancellation control and power, and you can also s... […]
- Bose QuietComfort 35 II vs. Sony WH-1000xM3: Face-Off on November 6, 2018 at 11:21 am
We've pitted these two goliaths against each other to determine the real winner of the active noise-cancelling war ... Sony's made some significant strides with its noise-cancellation technology, and ... […]
- Skullcandy Venue Noise cancellation headphones launched in India at Rs 18,999 on October 10, 2018 at 11:00 pm
The new lineup of wireless headphones is enabled with active noise cancellation (ANC) technology to deliver high-resolution ... along with the support for AI voice assistant. You can control music pla... […]
- Active Noise and Vibration Control Systems Industry 2025 Trend: Top Players Like Ois Aerospace, Lord Corporation, Hutchinson SA, Terma A/S, Moog Inc on October 7, 2018 at 5:00 pm
10/08/2018 -- The Top key vendors in Active Noise and Vibration Control Systems Market include are Moog Inc, Ultra Electronics Holdings Plc, Lord Corporation, Bosch General Aviation Technology GmbH, W... […]
- Carbon Nanotubes Shush Loud Heating and Air Conditioning Systems on September 26, 2018 at 10:04 am
They created an active noise control system, which works by playing back the opposite ... The goal of Barnard and Senczyszyn’s technology is to do the same thing inside HVAC ducts using coaxial thermo... […]
via Bing News