Hearing aid silences 'howl' from feedback

(First Edition)

THOUSANDS of people who suffer from 'howls' in their hearing aids could benefit from a new device to be launched in Britain next week, writes Susan Watts.

People with severely impaired hearing often find they must turn up the volume on their hearing aids so much that the microphone picks up sounds from the device's own loudspeaker, producing a howling feedback effect.

High frequencies cause the worst howls, so manufacturers have tried to alleviate the problem by limiting these in the sound their hearing aids amplify. GN Danavox, the Danish hearing aid maufacturer that paid the pounds 1m development costs, tried the device on 30 profoundly deaf people.

Many reported hearing high pitched sounds they had never heard before. One 10-year-old said she had heard 'a ghost' creeping up behind her. This turned out to be the wind.

The device feeds its own continuous test signal through the hearing aid, but at too low a volume to be heard. The hearing aid monitors the way the test signal is altered as it bounces around the ear canals.

This gives the device a clear picture of how ordinary sounds will echo around the ear, so it can produce a signal that is the exact equal and opposite of these unwanted sounds, cancelling them out almost immediately before they can cause feedback.

Start your day with The Independent, sign up for daily news emails
  • Get to the point
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Recruitment Genius: Bathroom Showroom Customer Service / Sales Assistant

£14560 - £17680 per annum: Recruitment Genius: Even though their premises have...

Recruitment Genius: Finance Manager

£44000 - £48000 per annum: Recruitment Genius: Marketing company based in cent...

Recruitment Genius: IT Installation / Commissioning Engineer - North West

£22000 - £25000 per annum: Recruitment Genius: An IT Installation / Commission...

Recruitment Genius: Telesales Executive - OTE £25,000

£16000 - £25000 per annum: Recruitment Genius: You will maximise the effective...

Day In a Page

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

How a costume drama became a Sunday night staple
Miliband promises no stamp duty for first-time buyers as he pushes Tories on housing

Miliband promises no stamp duty for first-time buyers

Labour leader pushes Tories on housing
Aviation history is littered with grand failures - from the the Bristol Brabazon to Concorde - but what went wrong with the SuperJumbo?

Aviation history is littered with grand failures

But what went wrong with the SuperJumbo?
Fear of Putin, Islamists and immigration is giving rise to a new generation of Soviet-style 'iron curtains' right across Europe

Fortress Europe?

Fear of Putin, Islamists and immigration is giving rise to a new generation of 'iron curtains'
Never mind what you're wearing, it's what you're reclining on

Never mind what you're wearing

It's what you're reclining on that matters
General Election 2015: Chuka Umunna on the benefits of immigration, humility – and his leader Ed Miliband

Chuka Umunna: A virus of racism runs through Ukip

The shadow business secretary on the benefits of immigration, humility – and his leader Ed Miliband
Yemen crisis: This exotic war will soon become Europe's problem

Yemen's exotic war will soon affect Europe

Terrorism and boatloads of desperate migrants will be the outcome of the Saudi air campaign, says Patrick Cockburn
Marginal Streets project aims to document voters in the run-up to the General Election

Marginal Streets project documents voters

Independent photographers Joseph Fox and Orlando Gili are uploading two portraits of constituents to their website for each day of the campaign
Game of Thrones: Visit the real-life kingdom of Westeros to see where violent history ends and telly tourism begins

The real-life kingdom of Westeros

Is there something a little uncomfortable about Game of Thrones shooting in Northern Ireland?
How to survive a social-media mauling, by the tough women of Twitter

How to survive a Twitter mauling

Mary Beard, Caroline Criado-Perez, Louise Mensch, Bunny La Roche and Courtney Barrasford reveal how to trounce the trolls
Gallipoli centenary: At dawn, the young remember the young who perished in one of the First World War's bloodiest battles

At dawn, the young remember the young

A century ago, soldiers of the Empire – many no more than boys – spilt on to Gallipoli’s beaches. On this 100th Anzac Day, there are personal, poetic tributes to their sacrifice
Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves

Follow the money as never before

Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves, reports Rupert Cornwell
Samuel West interview: The actor and director on austerity, unionisation, and not mentioning his famous parents

Samuel West interview

The actor and director on austerity, unionisation, and not mentioning his famous parents
General Election 2015: Imagine if the leading political parties were fashion labels

Imagine if the leading political parties were fashion labels

Fashion editor, Alexander Fury, on what the leaders' appearances tell us about them
Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

The architect of the HeForShe movement and head of UN Women on the world's failure to combat domestic violence