| With the rapid development of China's digital technology,computer technology and network technology,the DTV(digital TV)has been valued by many enterprises and become the development trend of television industry.Now the DTV is the consumer product with the fastest development and the largest user demand.At present,China's enterprises have set off an upsurge of studying DTV transmission strategy,formulating DTV standards,developing DTV equipment,and guiding the development direction of DTV technology.In recent years,with the rapid development of China's mobile Internet,the DTV industry has suffered a traumatic shock,but witch provides new ideas for the development of DTV.This paper introduces the domestic and abroad development status and DTV standards,and summarizes the advantages and disadvantages of DTV standards in China.A digital television terrestrial broadcasting receiving terminal software system is designed with the current development status of mobile Internet,the relevant DTV standards and equipment.The main work in this paper includes the following contents:(1)In order to design the more convenient and fast software system for DTV receiving terminal with relevant software system theory,and have the portability and modularity,the modular programming method is adopted to construct software framework structure based on hierarchical design,which makes the relationship in various codes of the receiving terminal become more clear,and which is beneficial to the following software development,upgrade and maintenance.(2)Formulate a specific implementation plan to use the multiple functions attached to the HI2016 main chip to create a human-computer interaction layer,because the main chip contains an OSG(Open Scene Graph that can efficiently create high-performance cross-platform interactive graphics programs)and an OSD(on-screen display)that can realize on-screen menu adjustment,so it can quickly construct a human-computer interaction layer,and create a human-computer interaction channel based on the message communication mechanism.Based on this and a task master control system is set up internally to plan business users' business.This intelligent operation mode greatly improves the operating efficiency and reaction ability of the entire system,and the stability can also be guaranteed.(3)Design mode of bus driver for DTV receiving terminal equipment.The channel demodulation module,audio and video decoding and control main module,audio and video amplification and output module and power module are analyzed and designed;and then the hardware structure of DTV receiving terminal is designed;the mediation chip,wireless audio connection chip,TUNER and SPI driver of the driver layer of DTV receiving terminal are designed and tested,and the software system of receiving terminal is realized;An API(Application Programming Interface)interface is designed to realize the software connection between the device driver layer and the system operation,and witch maintains the feasibility of the upper layer software in the whole system operation process.After designing the software system design of DTV terrestrial broadcasting receiving terminal,the system has been debugged many times and its function has been improved.The software system has strong feasibility,stability and low cost,which meets the demand of DTV market and promotes the upgrading and maintenance of DTV system. |
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