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The Research and Realization of Mobile Digital Television Receiver Based on DVB-T Standard

Author: XueYing
Tutor: GuoWenCheng
School: Tianjin Polytechnic University
Course: Pattern Recognition and Intelligent Systems
Keywords: Digital TV DVB-T Set-top boxes EM8620L
CLC: TN949.2
Type: Master's thesis
Year: 2006
Downloads: 343
Quote: 1
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Abstract


Mechanical television era , black-and-white electronic and color television era , positive high-definition television and digital direction gradually retire , analog TV worldwide . As technology development and deepening of the study , people in the mobile reception of digital terrestrial television broadcasting , spectrum efficiency , single frequency network , have a more profound understanding of interference , the system's flexibility . DVB-T network operators in Europe are to give full play to their mobile features to work hard in the multimedia value-added services , successfully achieved commercial operation . Domestic , before the introduction of the mobile digital TV standard , most cities have adopted the world's most widely used DVB-T network used in bus and subway as well as buildings and other public places is advertising Broadcaster is thriving value-added market . The righteous to the EM8620L program of Sigma 's latest digital TV as a development platform , DVB-T and MPEG-2 standard , first master the MPEG-2 codec principle and system structure, working methods, the underlying MPEG -2 transport stream formats and decoding method ; followed by the DVB-T signal characteristics , signal transmission frame structure , signaling transmission , synchronization , channel estimation , and the modulation constellation, and discussed in detail the principle of frequency division multiplexing (COFDM) of the quadrature encoder , DFT OFDM modulation and OFDM guard interval resistant to multipath interference , which makes the development of front - end DVB-T signal reception TU1216 tuner demodulator drivers have a good theoretical guidance ; combined with Sigma Universal again program , after digestion and absorption and to improve the original program , successfully designed the DVB-T hardware platforms and software operating platform ; DVB-T front - end LNB signal tuning the hardware and software platform , channel scan and channel the demodulated. DVB-T signal is demodulated become the standard TS stream , completed the TS stream packet packet filtering and demultiplexing , the STC time stamp regeneration , combined with PTS and DTS , the ultimate success of the video and audio synchronization , the frame the order is displayed correctly , the decoder buffer overflow or underflow management as well as video and audio decoding .

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