The key goals of MAVT are powerful video and audio coding schemes to transmit multimedia services in a mobile environment and implement them on a demonstrator. User requirements, network and channel-characteristics, service definitions and a general terminal architecture will be studied. MAVT will deliver future coding algorithms for low bitrate video (px8 kbit/s) and audio, and a futuristic terminal. Real time transmission of moving video in a DECT environment will be demonstrated as well as audio-visual data transmission in a UMTS environment by connecting the demonstrator to the testbeds of ATDMA and CODIT.
Another main goal of the MAVT project is to develop a joint European proposal for the MPEG-4 coding standard. MAVT will contribute to ETSI SMG 5 group by providing a reference model for mobile audio-visual data transmission.
The research objective was to find powerful video an audio coding algorithms for the transmission of moving and still video in a mobile environment (like the universal telecommunications system (UMTS)) and implement them on a demonstrator. This necessitated a study of user requirements, network and channel characteristics, service definitions and a general terminal architecture. The research aimed to provide future algorithms for low bit rate video (px 8 thousand bits per second) and audio coding and a futuristic terminal with several novel features, including a variable resolution display and good quality audio. New proposals for very large scale integration (VLSI) chips for video and audio coding were expected from the realization of the demonstrator.
The research has identified possible video and audio services for a mobile terminal and has defined the input video formats for those services. A reference model of low bit rate video coding was created and a first algorithm for px 8 thousand bits per second video coding was produced.
New algorithms were developed that optimise low bit rate video and audio coding in terms of bit rate, complexity and transmission delay. Some are based on current standards and are suitable for the short term development of a demonstrator. Other algorithms implemented with later versions using advanced coding techniques will contribute to the definition of future standards. Rate compatible punctured convolutional (RCPC) codes and combined source channel coding have been introduced into the video coding task.
After DECT demonstrator integration and real-time field trials with mobile audio-visual transmission, UMTS test beds will be connected for transmission of moving video. Most important is the long term reference model as European input to ISO MPEG-4 in close liaison with COST 211ter.
- Service definition and user requirements.
- Investigation of network and channel characteristics.
- Long and short term very low bitrate coding algorithms.
- Channel error protection and System control.
- Generic reference model for ISO MPEG 4.
- Multimedia Transmission in DECT, GSM and UMTS.
- Real-time demonstrator.
Results will contribute to standardisation within ISO, ITU and ETSI. Improvement of existing and development of completely new coding schemes will permit introduction of new applications into existing DECT and GSM networks, supported by the results of the DECT demonstrator field trials. Connecting the MAVT demonstrator to the UMTS test beds will give first ideas about the resulting quality of multimedia applications in third generation mobile networks.
MAVT will provide a standard for communications and industrial applications as only then will it be feasible to design a multi-purpose terminal integrating communications with multimedia and computing facilities.
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78392 Bois D'arcy
2260 AK Leidschendam
E1 4NS London