Page last updated at 08:57 GMT, Friday, 5 March 2010

Lip reading mobile promises end to noisy phone calls

The soundless communciation kit
The kit is still very much at the prototype stage

Technology that could see an end to the bane of many commuters - people talking loudly on their mobile phones - has been shown off by researchers.

The prototype device could allow people to conduct silent phone conversations.

The technology measures the tiny electrical signals produced by muscles used when someone speaks.

The device can record these pulses even when a person does not audibly utter any words and use them to generate synthesised speech in another handset.

"I was taking the train and the person sitting next to me was constantly chatting and I thought 'I need to change this'," Professor Tanja Shultz of the Karlsruhe Institute of Technology told BBC News.

"We call it silent communication."

Translation system

The device, on show at the Cebit electronics fair in Germany, relies on a technique called electromyography which detects the electrical signals from muscles. It is commonly used to diagnose certain diseases, including those that involve nerve damage.

The prototype that is on display in Germany uses nine electrodes that are stuck to a user's face.

Spacewalk
Nasa have explored the use of silent communication systems

"These capture the electrical potentials that result from you moving your articulatory muscles," explained Professor Shultz. "Those are the muscles that you need in order to produce speech."

The electrical pulses are then passed to a device which records and amplifies them before transmitting the signal via Bluetooth to a laptop.

There, software translates the signals into text, which can then be spoken by a synthesiser.

In the future, said Professor Shultz, the technology could be packed in a mobile phone for instantaneous communication.

"We know this is not appealing for mass market use at the moment."

However, she added, it could be initially used to help people who have lost their voice due to illness or accident.

It could also form the basis of an instant translation system, she said.

"You could speak in your mother tongue and the text could be translated into another language," she said.

"The person that you are communicating with would then hear the synthesised voice in the other language."

It is not the first time that electromyography has been explored for silent communication.

The US space agency Nasa has investigated the technique for communicating in noisy environments such as the Space Station. It has also used the technique to explore advanced flight control systems that do away with joysticks and other interfaces.

Nasa, she said, explored the technique to understand simple commands.

"The difference with our system is that we can record and recognise continually spoken sentences," said Professor Shultz.

Cebit runs from 2 to 6 March in Hanover, Germany.



Print Sponsor


SEE ALSO
Mobile phones get cyborg vision
11 Aug 09 |  Technology
SixthSense blurs digital and the real
14 Apr 09 |  Technology
Windows Touch coming to a PC soon
26 Mar 09 |  Technology
The future beneath your fingertips
16 Mar 09 |  Technology

RELATED INTERNET LINKS
The BBC is not responsible for the content of external internet sites



FEATURES, VIEWS, ANALYSIS
Has China's housing bubble burst?
How the world's oldest clove tree defied an empire
Why Royal Ballet principal Sergei Polunin quit

BBC navigation

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.

Americas Africa Europe Middle East South Asia Asia Pacific