Television on the go

Oct 06, 2005

Television via cell phone or PDA is an emerging market. At the IFA consumer electronics fair in Berlin, Fraunhofer researchers demonstrated how digital films can be transmitted to portable devices in good quality. The secret: dynamic bandwidth allocation using the DVB-H standard.

Mobility – a creed for the modern age. For many, this means constantly being on the move, whether it's in the car, on a train or in the air. Time spent on the road is not restricted to getting work done either. After all, everyone needs a break to catch the news, get the latest football results or to watch a favorite TV series. The demand for high quality video keeps rising. At the same time, consumers have more and more types of product and transmission media to choose from, particularly for mobile applications.

"Devices in the near future will contain three converging technologies: conventional television broadcasting, wireless technology and the Internet," says Thomas Schierl from the Fraunhofer Institute for Telecommunications in Berlin. "This means everyone will have ubiquitous access to special TV programming – perhaps some even tailored to the user's location." Supplementary information such as related Web pages can also be called up. In addition, users can surf the Internet and receive E-mails in typical fashion. All of this is possible using the Internet protocol – or IP as it's called.

At the IFA in Berlin, Schierl and his team showcased a digital television system for mobile devices based on the Digital Video Broadcasting for Handhelds (DVB-H) standard. The system provides good quality video transmission while optimizing the use of the available DVB-H channel. This is a key feature because with DVB-H, multiple television programs share a single channel. Different types of broadcast require different data rates. During a news broadcast with an announcer, the frame rate – the speed at which the images change – is less than when transmitting a track and field event, a football game or an action film. "It can happen that one station doesn't need to send at the maximum data rate to achieve optimal quality, while at this same point in time another station needs the full bandwidth."

"We developed a live server system that dynamically allocates transmission rates for each program," explains Schierl, who adds that the principle is referred to as statistical multiplexing. At the IFA, the researchers even demonstrated the system's capability to send live broadcasts to cell phones. Special servers encode the live images and align the video data rates across the individual programs within the DVB-H channel.

Source: Fraunhofer-Gesellschaft

Explore further: Just whose Internet is it? New federal rules may answer that

add to favorites email to friend print save as pdf

Related Stories

Galaxy dust findings confound view of early Universe

19 hours ago

What was the Universe like at the beginning of time? How did the Universe come to be the way it is today?—big questions and huge attention paid when scientists attempt answers. So was the early-universe ...

Recommended for you

Airbnb to expand tax collection efforts

Jan 30, 2015

Online lodging operator Airbnb is expanding its efforts to collect local taxes, responding to complaints that it competes unfairly with the hotel sector.

Jay Z to acquire Wimp music service

Jan 30, 2015

US rap star Jay Z will make a $56-million foray into the music streaming business by taking over the Norwegian service Wimp, its shareholders confirmed Friday.

Scientists trial system to improve safety at sea

Jan 30, 2015

A space scientist at the University of Leicester, in collaboration with the New Zealand Defence Technology Agency and DMC International Imaging, has been trialling a concept for using satellite imagery to ...

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.