Design And Implementation Of Digital Tv Modulator Program

HDTV (High Definition Television) technology integrates the most advanced image compressed encoding technology and the digital communication technology. The DTV-related products represent the developing trend in the consumer electronic market in the coming years.The structure of this paper is arranged as follows:The first chapter introduces the development of the DTV. The DVB-C transmission system is also introduced for the convenience of further introduction.Chapter 2 provides the implementation scheme of DTV modulator. The design of the scheme is mainly in consideration of good adaptability for variable transmission systems.Chapter 3 introduces the digital phase-locked-loop used in the modulator scheme. The digital PLL is of great importance in the control of the whole system. Since the performance request for the PLL in modulator is relatively loose, this chapter simply discusses the aspects according to the performance request.Chapter 4 is mainly about interpolator used as sample rate converter. The used of interpolator makes the adaptability of the modulator scheme come true.Chapter 5 presents a novel approach to implement the sample rate variable pre-equalizer in the modulator. Pre-equalizer is an option in the design of modulator, but it is always used in order to improve the quality of the IF-signal. Sample rate variable is a must for the pre-equalizer in this scheme. Analysis shows that the implementation of such pre-equalizer can be very simple and effective.Chapter 6 concludes the whole paper and provides some discussion.