The Research And Application For Demodulator And Demux Technology Of Digital Television

Hisense Research and Development develops the Chinese first integrated digital TVSystem on Chip which carries with internet and multimedia functions.The chip realize asolutions to the software system of digital TV System on Chip based on domestic CPU.The thesis’s software platform bases on integrated digital TV System on Chip softwaresystem. It includes a set of completed embedded software systems from the bottomdrivers to the upper application.Driven adaptation layer is located in the bottom of the system software, combinedwith System on Chip closely. the chip provides support for the operation of the driver, Itprovides driver program to support chip operation, involving audio driver, video driver,demux driver, decoder driver and so on. This thesis selects the demodulator module anddemux module which are used as the core and key research.Firstly, the thesis introduces the hardware system and software system of thedomestic integrated digital TV System on Chip,and analyses the framework ofthis platform. Secondly, it makes a brief description of the working principle of the tuningmodule and demodulation module, etc. According to the main function interfaces ofMxL601tuner and ATBM8878demodulator provided by manufacturers, the thesiscompletes the integration and package of the two modules’ codes in order to adapt to theupper interface.Thirdly, the work focuses on the structural design, workingprinciple, demux codes flow, the main interfaces and the system error processing.Finallyit realizes the design of demux module. While the verification interface is available,itcan dock with middleware which completes the transmission of data streamsefficiently.At last, By building the test platform and analoging the working process of TVsets, the thesis verifies the function of demodulator module and demux module.And itanalyzes the problems encountered in the testing which achieves the desired effect.The demodulator module and demux module designed in the thesis are an importantparts of software development kits of the first domestic integrated digital TV. Afterintegrateing,debugging and verifying, the modules will fit with other modules to complete the TV machine functions. The results of the thesis have important applicationvalue.