The Research On The Source Decoder Board Circuit Of Digital TV Set Top Box

Nowadays,analog TV is still in use,and digital TV set top box(STB) is aeconomical method to receive digital TV program.To develop digital TV STB is veryimportant to the digitalization of TV&Broadcasting.The purpose of the paper is todevelop the digital TV set top boxes used bythe domestic broadcasting operators anddigitalcableTVconsumers.ThispaperfirstintroducesthebasicconceptsofdigitalTVSTB,MPEG-2andDVB standards;then descripts the hardware of source decoder of DVB-S STB,nextpresents the content of improvement of audio&video performance of DVB-C STB,intheendthispaperalsointroducestheFLASHdriverofDVB-SSTB.This paper is mainly about the hardware of digital TV STB,the research is ontwo kinds of digital TV STBs:digital video broadcasting-satellite(DVB-S) STB anddigital video broadcasting-cable(DVB-C) STB.These two source decoder boards arebased on STi5518 and QAMi5516.The research on DVB-S STB is mainly aboutdigital audio output circuit and the developing of driver for FLASH.The digital audiooutput circuit canprovidedigital audiooutput signal inaccordwithAES3 format;Thedriver for FLASH is developed for M29W320ET FLASH,and is the function set thatcan be used bythe upper part of the software system.The research on DVB-C STB ismainly about the improvement of audio&video performance.In this part,first we gotfoundamental understanding on audio&video performance,and then we used PSpicefor theoretical analysis,and worked out the conclusion according to the experimentresults.