Research On Receiving DVB Data By Cable Modem

Telephone, television and computer network merging in one is an inevitable trend as communication technology developing. The equipments of HFC mainly include CMTS (Cable Modem Termination System) and CM (Cable Modem). The author is one of the members of the research project of Chongqing city, CM and CMTS, and is familiar with CM . The ASIC (Application Specific Integrated Circuit) is placed in core. It implements modulation/demodulation and DOCSIS (Data-Over-Cable Service Interface Specification) protocol. The author accumulates abundant experience for the HFC network and the RFI (Radio Frequency Interface) specification. All above supply a good beginning for this thesis. Now the Digital TV has developed rapidly in the world, and its protocols mainly include the ATSC of America and the DVB of Europe. Chinese Digital CATV standards deploy the DVB-C protocol. Currently the main research is concentrate to make the Analog TV receive the Digital TV signal through the set-top box (STB). But how make the PC receive the Digital TV signal through the CM is still valuable for providing a cheap access to integrated services for personal users. This thesis describes the relationship between the physical level of DVB-C and that of DOCSIS, and demonstrates the feasibility of using CM to transmit the Digital TV signal to PC. This thesis also provides the conditions for the CM that can be used to transmit DVB-C signal.At last, author provides a design for cable modem receiving and transferring the DVB data, and implements a decoding experiment in PC. In the experiment, a MPEG-2 TS(transport stream) file is segmented and transmitted to　the PC with another IP address using windows system. All this is useful for implementing the DVB receiving on PC through cable modem.