浅谈地面数字广播电视发送系统的设立

在原有模拟发射台站建立数字广播电视发送系统,应尽可能考虑使用原有的模拟电视发送系统设备和用户利用原有接收天线,尽量低的经济投入来开展地面数字广播电视。采用多工器完成RF功率合成、多频道放大器合成,可使地面数字广播电视使用现有的模拟广播电视发射天线。     

监控系统中采用SC8880实现信息无线传输

本文主要介绍了SC8880集成电路芯片的功能、基本工作原理及其在无线通信中的应用。重点讨论在监控系统中，借助微处理器的智能控制，利用SC8880实现信息的无线传输，并给出最基本的电路原理图和源程序代码。     

通用广播电视发射机射频功率监测报警器研发

广播电视发射机射频功率监测报警器主要用于实现多手段、全方位保障广播电视信号安全播出,它是广播电视系统的重要组成部分。文章主要针对无线发射台在复杂环境下高质量播出要求及特点,运用C语言和STM32单片机开发的广播电视专用监控报警设备的研发目的、设备原理、软硬件配置方法及技术要点和应用效果。     

Control of clock signals

Precision and reliability of timescales are of importance in many situations, in particular in satellite navigation systems (i.e., Galileo system). Motivated by the necessity to improve the precision and the reliability of such clock signals, we have explored the possibility to exploit control theory in clock steering methods. First of all we provide a more robust theoretical framework for the analysis of the process. Two novel control algorithms are here proposed aiming to meet metrological specifications. Numerical simulations have been performed in order to evaluate the performances of the new control systems.     

Simulation of modulated signals

A new formulation for the simulation of modulated signals based on a generalized structure is presented. In this approach a modulated signal is characterized in terms of a time-varying system whose differential equation is simulated. Algorithms presented in the paper may also be used to track signal parameters such as the envelope and the carrier. This concept is illustrated by several algorithms of AM and FM simulators.