| TV in people's ordinary life is changing from analog TV to digital TV. Traditional and classical digital TV both had characteristics of FDM, timing, and unilateralism broadcasting. Classical digital TV had some technology reformation than analog TV, such as the change of signal formal, but it did not touch upon the media content's transmit fashion. In the thesis the software digital TV, also namely IPTV, is one newness technology including network,multimedia and communication technology to supply much mutual-pattern service including digital TV to family user through broad band CATV net. The user can enjoy IPTV service in home through two manners: computer or network box plus. It can fit network's fast development commendably, make use of network resource plenty and effectively. The paper analyzed computer's application in obtaining TV program, proposed the whole frame and core technology of software digital TV, and put forward one technology of implanting video digital watermark as settling measure to protect program fountain's copyright.Firstly, the thesis protested adopting Microsoft software TV framework based on DirectShow to design software digital TV system. This way makes the various key technology divided into different groupware, and developer can decide easily whether doing-it all by self or cooperating with others to avoid unnecessary wastes.Secondly, the thesis emphasized the technology of video digital watermark based on MPEG2, through which copyright information can be infiltrated in the course of DCT transform using the half-decode way in the server end. And by the same way in the client end, watermark information can be parsed conversely so that the program fountain can be protected effectively.Lastly, in the core technology of software digital TV, the thesis focused on the MPEG2 system layer (also namely TS stream) technology, which are nucleus and key in the course of opening out software digital TV. In the aspect of signal's network transmission, the thesis proposed using RTP/RTCP to carry TS stream to answer the sordid network circumstance. RTP/RTCP combining with IP can feed back the bidirectional network bandwidth information in server and client end so that the server can adjust timely according to client's network status.According to the analysis and based on the paper, the author opened out the independent software client end software of digital TV design a imitation Streaming Media server in server end. And expectant purpose has been achieved through running test in the laboratory. |
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