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: The delivery drones are coming, so rules and safety standards will be needed – fast

Related Stories

Amazon says FAA drone approval already obsolete

31 minutes ago

The approval federal aviation officials gave Amazon.com last week to test a specific drone design outdoors is already outdated, the company's top policy executive said Tuesday in written testimony to a Senate subcommittee.

Firm combines 3-D printing with ancient foundry method

41 minutes ago

A century-old firm that's done custom metal work for some of the nation's most prestigious buildings has combined 3-D printing and an ancient foundry process for a project at the National Archives Building in Washington, ...

Recommended for you

Cost-effective production of magnetic sensors

12 hours ago

They are found wherever other measurement methods fail: magnetic sensors. They defy harsh environmental conditions and also function in fluids. A new procedure is now revolutionizing the production of two-dimensional ...

Measurement of components in 3D under water

12 hours ago

Conveying systems for oil and gas, operated in the sea have many important underwater components. The maintenance of such components is elaborate and expensive, as measuring them is complicated. Fraunhofer ...

Plastic parts for internal combustion engines

13 hours ago

Efforts to produce lighter vehicles necessarily include engine parts, such as the cylinder casing, which could shed up to 20 percent of its weight if it were made of fiber-reinforced plastic rather than aluminum ...

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.