The Research And Realization Of Digital And Analog Double Model Television' Signal Receiving Terminal

Digital Television, with many advantages, has wide development space in future. In the world, DTV and DTV industrialization are developed vigorously by many countries. Especially terrestrial broadcasting television system has developed rapidly in recent years. There are three mainstream terrestrial DTV transmit standards——Europe's DVB-T, USA'ATSC, Japan's ISDB-T, but with superiorities, they all haveown inferiorities. According to domestic and foreign experiences, China has proposed a novel terrestrial DTV transmit standard DTMB that has been implemented in August 1, 2007 and have proprietary intellectual property rights of it.In this paper, basing on the research of DTMB standard, the hardware platform of television receiving terminal which can receive not only DTMB digital signal but also analog signal, has been designed. This paper is made up of the following parts:1. The present development status and the standards of DTV both in foreign and in china are researched and analyzed. Compare with three terrestrial DTV transmit standards, the principle and technology of DTMB is analyzed with emphasis.2. The hardware platform that with source decoder and center control chip Hi2016 , demodulator chip LGS-8g42 as core component ,has been designed. The design is done based on how the system work and what functions the chips have. The paper also introduce the related chips like SDRAM,FLASH.3. Software and debug platform of the system has been introduced. The system is debugged and the drive program of tuner and demodulator chips is important work.Finally, the hardware and software of the design has been debugged successfully and obtains the anticipated result. This design proposal has high performance-to-price ratio and wide spread application. It is anticipated to make help to china's DTV industry.