Beating noise pollution with smart tech

Sue Pearl and her husband David wake up feeling grumpy every morning.

"My husband snores so loudly that the whole house shakes," says Sue, reports BBC.

David, a 65-year-old solicitor from London, has tried just about everything to cure the problem, from nasal drops and strips, to sprays, and even an electric bracelet that gave him a mild electric shock.

Yet nothing has worked, and even his ears, nose and throat doctor is at a loss.

"I'm often woken up, my sleep is so disturbed, so I'll send him to the spare room," says Sue, who is a voice-over artist. "It's a nightmare. It's exhausting living with a snorer, neither of us sleep properly, it really isn't great for any relationship."

It is not just the sound of a snoring partner that can affect your quality of life. From living near a busy road or airport, to noisy neighbours, or blaring music, noise pollution can have a detrimental impact on your mental health.

In fact, the European Environmental Agency says that excessive noise is actually killing people. It estimates that long-term exposure causes 12,000 premature deaths per year across the European Union.

Meanwhile, the World Health Organization says that noise pollution is an "underestimated threat that can cause a number of short and long-term health problems, such as, for example, sleep disturbance, cardiovascular effects, poorer work and school performance, [and] hearing impairment".

Aside from good old ear plugs and noise-cancelling headphones, a number of tech companies have been scrambling to find new ways to drown out increased unwanted sound.

One such firm is Israeli business Silentium, which says that its "Quiet Bubble" system can significantly reduce unwanted sound - even if it is coming from a husband lying beside you in bed.

The technology is based around a speaker and microphone. How it works is rather complicated, but in simple terms the microphone listens to the unwanted sound, and then the speaker emits a noise that cancels it out.

For readers that want a more technical explanation - computer algorithms process the unwanted noise, and the speaker releases the same sound waves, but in the opposite phase, or back to front. This creates interference, which cancels out much of both sounds.

Called active noise cancelation, it has existed in headphones for a number of years, but companies like Silentium have developed the technology to work without having to put a pair of cans over your ears.

"You can fit our speaker and sensors to your bed's headboard, and the sound of your partner's snoring would be dramatically reduced, as it generates 'anti-noise'," says Silentium's chief executive Yoel Naor.

He adds that the technology could also be used in cars. "Your kids could be in the back playing Disney on full blast, or even arguing, and you wouldn't be able to hear much in the front."

The company says its technology can also create "individual sound zones", whereby the sound from an array of speakers is focused on a very specific area of space, and minimised outside of that zone or bubble. The idea is that someone on a train, or plane, can listen to music or watch a film without headphones, and yet still not bother people sitting nearby.

In his laboratory Mr Naor has two chairs side by side to demonstrate how this directional sound projection works. Depending on which seat you sit in you hear a different song being played through the assorted speakers. And you cannot hear the other tune.

Silentium is already working with carmaker Jaguar Land Rover, and hopes to interest other car firms, plus trains and airline companies with its tech.