Development Of Mobile Multimedia Broadcasting Receiving And Playing System Based On CMMB Specification

Multimedia Broadcasting, also called "Mobilephone TV" or "Mobile TV", is one of the most attractive applications in the field of consumption electronic product. During the period of Beijing Olympic Games, "Mobilephone TV" has become one of the broadcasting media focus on Olympic Games. CMMB, which stands for China Mobile Multimedia Broadcasting, is the first mobile multimedia broadcasting specification made by China independently. It is made for the application of mobile terminals, such as mobilephone, PDA, MP3, MP4, digital camera and laptop. Mobile multimedia broadcasting receiving and playing system based on CMMB specification is able to receive and play TV program, also to receive and display Electronic Service Guide (ESG). Each mobile multimedia broadcasting specification in the world is to be compared at the first part of the paper, and then technology specification of CMMB and the demand of the system will be show. As an application development based on embedded system, some knowledge of embedded system is in need. So on this paper, embedded system is introduced in brief, while emphasizing the technology specification of the embedded software and hardware platform which used for the application discussed on this paper. Real Time Operating System (RTOS) is the import part of the embedded software platform. The research content of this paper include introduction of embedded system software and hardware platform, study of CMMB specification, software and hardware design and implementation, system test and result analysis. According to TV broadcasting service and ESG service, the structure of CMMB Multiplex frame is introduced. Component of ESG and ESG parsing is explained in detail. In the part of system design and implementation, software design based on module is the key point. Cooperating with main control chip and CMMB demodulator chip, software is able to implement chip driver and chip control, multiplex frame parsing, user interface painting and audio/video decoding. Meanwhile, problems and solution will be discussed during the course of design and implementation.