基于矢量控制理论设计了一套全数字变频调速系统。
Based on vector control theory, a fully digital variable speed system is designed.
本文根据数字化干扰的应用需要，提出了一种有效的数字变频算法。
In this article, according to the application requirements, an effective algorithm for digital frequency conversion is provided.
在这个平台上对短波信号射频数字化，然后进行数字变频，获得宽带基带解析信号。
In the platform, the short wave signal is digitalized in the radio frequency band and converted into the analytical baseband signal.
设计了一套圆筒形直线感应电动机驱动的电梯全数字变频控制系统，对其进行了试验。
This paper introduces a frequency variable control system for elevator driven by linear induction motor, and this elevator has been tested.
基于矢量控制理论设计了一套全数字变频调速系统，介绍了系统结构及软硬件设计方案。
Based on vector control theory, a full digital variable speed system is designed. The system structure and method for designing the software and hardware are introduced.
此外，通过模拟或数字无线电选项，“龙信使”可以为操作人员在野外环境提供可变频通信能力。
Additionally, Dragon Runner SUGV, gives operators field-changeable frequency capabilities, using analogue or digital radio options.
介绍一种以igbt为功率单元的全数字控制脉宽调制变频装置。
A fully digitally controlled SPWM inverter with IGBTs as the main power devices is introduced.
最后，基于FPGA对数字下变频进行了设计及实现，具体包括：算法仿真、VHDL描述、FPGA仿真和实际系统测试。
At last, this thesis realizes digital down converter based on FPGA, and the whole designing process includes algorithm simulation, VHDL description, FPGA simulation and real system test.
交流变频电驱动钻机采用VFD驱动和数字控制技术，可简化绞车结构，提高钻机性能。
AC VFD rig adopts VFD and digital control technology, simplifying the drawworks structure and improving the rig's performance.
论文在最后给出了在处理机实验平台上进行的数字上下变频系统的实验结果。
The last part gives the test results of digital up convert and digital down convert system, produced by the experimental platform.
数字下变频技术是数字化雷达接收机的关键技术之一。
Digital down - conversion (DDC) is an important technique of digitized radar receiver.
介绍全数字交流变频调速装置在不锈钢横切生产线上的应用，说明其基本配置、功能和控制特点。
To introduce the application of fully digital AC frequency converter in the stainless steel cut to length line, describe its configuration, functions and control features.
数字下变频技术是软件无线电中的关键技术之一。
Digital variable frequency is a key technology of soft radio.
变频器的控制电路采用数字技术，容易升级、适用范围广。
Its control circuit adopts digit technology, so it is easily promoted, its applicable bound is wide.
数字下变频技术是软件无线电中的关键技术之一。
Digital down converting is one of the key technologies of software radio.
分析了基于多相滤波结构的宽带侦察接收机中频数字信号下变频处理方法。
This paper analyzes the digital down conversion (DDC) of wideband reconnaissance receiver IF digital signal based on polyphase filtering.
在宽带数字接收机中，高速数据流的实时处理对后继数字下变频器性能提出了极为苛刻的要求。
The real time processing of high speed data flow makes strict demands on the performance of descendant digital down converter in the wideband digital receiver.
接收部分主要是扩频系统的数字下变频、积分清洗、匹配滤波器解扩、功率检测、符号跟踪、差分译码等技术。
The receiver unit mainly consisted of the digital down converter, matched filter, integration and dump module, power detector, symbol tracking processor, differential demodulator and so on.
研究了高倍抽取的数字下变频设计，重点分析了基于级联积分梳状滤波器、级联补偿滤波器、级联根升余弦滤波器的多级抽样频率算法。
In this paper, the high decimation ratio of digital down converter is studied and the multi-stage decimation algorithm is especially analyzed based on CIC filter, CFIR filter and RRC filter.
在此基础上，提出了数字下变频技术在可编程数字下变频器HSP50214 B中的应用方案。
On the base of these, the paper analyzes applications of digital down converting in the HSP50214B programmable downconverter.
在此基础上，介绍了中频数字采样单元和基于FPGA的数字下变频单元的具体设计。
Based on these elements, the material design of if sample and digital down converter based on FPGA is specified.
该变频器采用全数字控制，结构简单、控制灵活，为变频器产品的开发提出了一种全新的设计方法。
The inverter USES the full digital control method, so it is simple in construction, flexible in control. This paper presents a new design method of inverter product.
实践证明，GC 5016作为数字上变频器性能满足TD系统的要求。
The practice proves that the performances of GC5016 as a digital up-converter meet the requirements of TD system.
介绍了软件无线电的基本思想及结构，提出了一种基于可编程数字下变频器HSP50214B的中频软件无线电接收系统的设计方案。
The basic concept and architecture of software radio is introduced in this paper. And a type of software radio receiver based on programmable digital down converter (DDC) -hsp50214b is presented.
实验应用了基于最小二乘法的数字滤波技术、多通道采样技术、变频率采样技术。
Digital filtering technique based on least square method multichannel sampling technique and frequency variation sampling technique were used experimentally.
实验应用了基于最小二乘法的数字滤波技术、多通道采样技术、变频率采样技术。
Digital filtering technique based on least square method, multichannel sampling technique and frequency variation sampling technique were used experimentally.
在信号的中频数字接收过程中，数字下变频、载波频率与相位跟踪是设计的关键所在。
In the process of signal digital intermediate-frequency received, digital down convertion, frequency tracking of carrier and phase locked loop are the keys.
这种基于公共直流母线的全数字交流变频控制系统适用于高速纸机的高速度、高可靠性控制性能的需要。
The all-digital ac frequency conversion control system based on the common DC bus can meet the requirements of high speed and high reliable control performance of the high-speed paper machine.
数字下变频在接收系统的数字化和软件化过程中起到了至关重要的作用。
Digital down conversion plays a key role in the digitized and software-oriented process of the receiver system.
数字下变频在接收系统的数字化和软件化过程中起到了至关重要的作用。
Digital down conversion plays a key role in the digitized and software-oriented process of the receiver system.
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