Space Constrained System Research And Hardware Implementation Of The Video Decoder

Recently, there are many breakthroughs in the research of DTV (Digital Television) worldwide. Audiovisual technology is now under revolutionary change. The 21st century is a digital information epoch. Digital Television and HDTV (High Definition Television) become the focus of attention. When HDTV is popular to people and the digital video broadcasting (DVB) system is equipped, people can enjoy not only high definition pictures but also the transmission of bidirectional interactive information, which includes some new functions, such as ordering program, browsing in Internet, sending e-mails, doing e-shopping and calling on e-bank.The key technology of DTV is MPEG-2 coding and decoding. As an International standard, MPEG-2 is applying widely to digital television, HDTV, multimedia technology and DVB.First, this paper simply introduces Digital TV, Video compression principles and the standards in common use. Then, it carefully analyzes the key techniques of MPEG-2 video coding and its coded stream's hiberarchy, picture types, profiles and levels. In Chapter three, it expatiates the modules in the video decoder separately, including Variable length decoding(VLD), Inverse scan(IS)/Inverse quantization(IQ), Inverse DCT(IDCT), and Motion compensation(MC). In Chapter four, this paper focus on several schemes on the implementation of video decoder in the space restricted system, presents their advantages and disadvantages, and the optimization of the off-chip frame storage. Finally, it summarizes the whole paper and gives advice for future work.