Reduced noise allows clearer mobile phone conversations

Feb 19, 2008

Dutch researcher Richard Hendriks investigated how background noises can be suppressed in order to provide better sound quality in applications such as mobile phones and hearing aids.

Speech-processing systems, such as hearing aids or mobile phones, are used in a wide variety of situations. A range of background noises such as traffic, music or voices can make it difficult for people to understand each other through equipment such as a telephone or a hearing aid.

Hendriks focused on improving speech and, in particular, on suppressing background noise. His aim was to improve the existing methods that make use of just one microphone.

First of all, Hendriks investigated how the power density spectrum of pure speech could be better estimated from the noise-distorted speech. Secondly, he examined how the speech signal could be better estimated from the disrupted signal by making use of improved statistical models. Finally, he took a closer look at a method for estimating the power density spectrum of the noise.

Hendriks then combined these three methods into a single all-encompassing system to improve the speech quality. Listening tests were used to compare the new system with an existing state-of-the-art system for improving speech quality. The new system was found to provide a significantly better quality.

As a follow-up to this study, the researchers from Delft have just started a project in partnership with a hearing aid company. This project will focus on how to improve the comprehensibility of speech for hearing aid users.

Richard Hendriks research was funded by Philips and Technology Foundation STW.

Source: NWO

Explore further: First drone in Nevada test program crashes in demo

add to favorites email to friend print save as pdf

Related Stories

Microbial 'signature' for sexual crimes

6 hours ago

Bacterial communities living on an individual's pubic hairs could be used as a microbial 'signature' to trace their involvement in sexual assault cases, according to a study published in the open access journal Investigative Ge ...

Brazil: Google fined in Petrobras probe

7 hours ago

A Brazilian court says it has fined Google around $200,000 for refusing to intercept emails needed in a corruption investigation at state-run oil company Petrobras.

Atari's 'E.T.' game joins Smithsonian collection

8 hours ago

One of the "E.T." Atari game cartridges unearthed this year from a heap of garbage buried deep in the New Mexico desert has been added to the video game history collection at the Smithsonian.

Sony threatens to sue for publishing stolen emails

8 hours ago

A lawyer representing Sony Pictures Entertainment is warning news organizations not to publish details of company files leaked by hackers in one of the largest digital breaches ever against an American company.

Microsoft builds support over Ireland email case

8 hours ago

Microsoft said Monday it had secured broad support from a coalition of influential technology and media firms as it seeks to challenge a US ruling ordering it to hand over emails stored on a server in Ireland.

Recommended for you

First drone in Nevada test program crashes in demo

7 hours ago

A drone testing program in Nevada is off to a bumpy start after the first unmanned aircraft authorized to fly without Federal Aviation Administration supervision crashed during a ceremony in Boulder City.

Fully automated: Thousands of blood samples every hour

15 hours ago

Siemens is supplying automation technology for the longest and one of the most cutting-edge sample processing lines in any clinical laboratory. The line, or automation track, 200 meters long, in Marlborough, ...

Explainer: What is 4-D printing?

15 hours ago

Additive manufacturing – or 3D printing – is 30 years old this year. Today, it's found not just in industry but in households, as the price of 3D printers has fallen below US$1,000. Knowing you can p ...

First series production vehicle with software control

16 hours ago

Siemens has unveiled the first electric series production vehicle with the central electronics and software architecture RACE. This technology, developed in the research project of the same name, replaces ...

Amputee puts limb system through its paces

18 hours ago

"Amputee Makes History with APL's Modular Prosthetic Limb" is the headline from Johns Hopkins Applied Physics Laboratory, where a team working on prosthetics observed a milestone when a double amputee showed ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.