downconverter meaning in Chinese
降频转频器
Examples
- Specification and methods of measurement on mmds downconverter
多路微波分配系统mmds下变频器技术要求和测量方法 - As the spread spectrum and despread of digitalization are handled on the digital baseband , it is very important to convert medium frequency signal in analogue to digital baseband signal , and the downconverter functions to convert analogue medium frequency to analogue baseband signal , and to digital baseband signal through a / d transformation and decimation filter
所以把模拟的中频信号变为数字基带信号的下变频器就显得非常重要。在这里下变频器的作用是将由前一级接收而来的模拟中频信号变为模拟的基带信号，再经过a / d转换和抽取滤波成为数字的基带信号。 - Digital down converting is one of the key technologies of software radio . it can improve the efficiency and reliability of communications . lt is also important to realize software radio receivers . the paper focuses on the technologies involved in digital down converting , such as integer sampling - rate conversion , non - integer sampling - rate conversion and carrier frequency offset estimation algorithm . on the base of these , the paper analyzes applications of digital down converting in the hsp50214b programmable downconverter . the hardware and sofeware of the application of digital down converting are also introduced
数字下变频技术是软件无线电中的关键技术之一。该技术不仅有助于提高通信的有效性和可靠性，还对实现真正的软件无线电台有着重要的意义。本文对数字下变频所涉及整数倍采样率转换、非整数倍采样率转换和载波初始频差估计校正作了较深入的研究，并提出了一些实用高效的实现结构和算法。 - Secondly , we used the dsp assembly language to perform the carrier phase tracking based on a digital processing system . this system is designed according to the idea of software radio . this digital processing system realized the intermediate frequency digitalization . with the diverse configuration of the digital upconverter and digital downconverter in this system , it can carry through many signal modulation modes . and because the carrier phase trac king is performed using software in dsp , it brings great convenience to this system and makes this system available in many digital communication systems
在该数字处理平台上可通过加载不同的软件对平台中的数字上下变频器进行灵活的配置以实现不同的数字调制解调制度，通过将载波的相位跟踪工作放在dsp软件中进行带来了很大的灵活性，能够适用于当前许多种数字通信系统。 - According to the requirement of system property , ad6640 and hsp50214b are selected functioning as a / d switcher and specific programming digital downconverter , then the paper highlights the structures , functions , applications , designs and outer interface circuit connect of the ad6640 and hsp50214b
结合系统性能的要求，选择了ad6640和hsp50214b为a d转换器和专用可编程数字下变频器。重点分析了ad6640和hsp50214b的结构功能、应用设计以及外围接口电路的连接。