An improved data transmission system based on HDMI is proposed and implemented in this paper. First, the structure and algorithm of HDMI are discussed and analyzed. Second, according to the audio/video format requirements, a data transmission system based on an improved TMDS codec algorithm of HDMI transmitter and receiver is designed. Third, in order to optimize the internal modules, the encoding algorithm and some internal modules are improved and optimized. Moreover, a color enhanced module

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... nd an error correction module are added to the system so as to achieve a better data transmission performance. Finally, the proposed system is implemented using Verilog DHL language and simulated by Modelsim. The simulation results show that the proposed system achieves the functions of data sending and receiving with better performance.