Design And Implementation Of Digital Cable Set-boxes

With the development of digital television, and now the family has been using digital TVto watch programs is the mainstream, especially in high-definitiondigital technology to get more and morewidely used. But many families to buy television sets are not built-in digital TV signaldecoding hardware and software architecture, we design and implementation of digital cable set-top box market and has great application prospect.China's digital cable TV standard based on the European DVB-C, and the input frequency can not be applied to players, so need to take a certain approach to treatment,must be tuned and demodulatedsignal into a digital signalthat can play mode. On this basis, the tuning used by Entropic communications chip company EN4020,demodulator chip STMicroelectronics (ST) of theSTV0297E two chips on thefront-end digital signal processing data flow, through the access signal correction, filtering ,IF demodulator and a series of steps to be able to handleplayback module model.Player management module as the embedded Intel CPU ce3100master platform, application linux2.6 operating system as its basic framework, including the underlying driver,the upper application design, write, compile and debug, in order to on the acquisition Decode digital television signals and analysis, from the received TS stream to getbasic audio, video stream and all program information.The production of electronic program menu key is to provide to the user able to selecta broadcast, to understand the current programs and program content within the coming week, view broadcast information such as time and duration of the function.In this paper, willreceive digital television signals, tuning,demodulation, decoding and playback in detail. This equipment has been testeda long time, well, the searchfrequency rapidly, the output television program information is accurate, does not appear the phenomenon of breaking codes and mosaics, a better playback quality, to achieve the expected standards. Through the embedded platformbased on digital cable set-top box development, further deepening of the operating system, application understanding of programming, so in the future developmentand accumulated the necessary experience.