查询词典 frequency converter

The main products cover: high-frequency switching power supply transformer; communications power supply, signal transformer (CO interfaces, dial-up, ADSL, ISDN, etc.); linear transformer; AC-DC/AC converter; transformer; step-up transformer (backlight source, etc.); voice signal separator; Filters: magnetic coil; inductor and other magnetic devices.

主要产品含括：高频开关电源变压器；通讯电源、信号变压器（局端介面、拨号、ADSL、ISDN等）；线性变压器；AC-DC/AC转换器；互感器；升压变压器；语音信号分离器；滤波器：磁环线圈；电感器等磁性器件。

The operation condition of a series-resonant converter is equivalently analyzed under open-loop condition. OCC condition and selection basis of resonant parameter and switching frequency are determined. The relationships between LED number, transformer turns ratio and constant current error are also determined, which provide scientific basis for the selection of LED number and transformer turns ratio.

文中通过对串联谐振变换器开环工作状态的等效分析，确定开环恒流条件和谐振参数与开关频率的选择依据，以及LED数目、变压器变比与恒流误差之间的关系，为LED数目及变压器变比的优化选择奠定了理论基础。

A multi-resonant DC/DC converter, which is very fit for ultra-high frequency applications is analyzed.

分析了一种非常适合工作在超高频下的多谐振DC/DC变换器。

That is to say, by using the special digital converter or running relevant arithmetic, it converts the radio signal to intermediate frequency signal and completes the base-band signal process that isn"t the veriest SR and is named "software defined radio. This paper introduces the rapid system prototype into the design of software radio system, which has great advantage because rapid system prototype technology can be used to describe the future application.

由于受到硬件性能如A／D、D／A及DSP芯片处理速度的限制，目前的软件无线电系统多采用折中的实现方案，增加专用的数字变频器或者运行数字变频算法，将射频信号变频到中频，然后再进行基带信号处理，这样的软件无线电系统又被称之为"软件定义无线电"，它并不是真正意义上的软件无线电。

A kind of tunable frequency-selective converter based on nondegenerate four-wave mixing in semiconductor laser amplifier is proposed in this paper.

庞叔鸣 ，崔一平，蒋雁提出了一种可调谐选频变频器，利用半导体光放大器中的非简并四波混频过程实现波长转换。

The existing system digitizes the IF signal at the output of the intermediate frequency amplifier by using a 40MSPS A/D converter and improves the real-time ability of the system with the help of high-speed DSP and high-speed local bus.

现有系统从辐射计的中频输出直接进行采样速率为40MSPS的A/D转换，并采用高速DSP和高速局部总线来提高系统实时性。

A high-speed digital-to-analog converter measurement method acquires and quantizes an analog ramp output by the DAC corresponding to a digital ramp input to produce a quantized ramp, determines a start and end of the quantized ramp, obtains a difference between the quantized ramp and an ideal ramp to produce a quantized periodic signal, determines a frequency for a qualified peak from an FFT of the quantized periodic signal, produces a mask filtered periodic signal from an iFFT around the qualified peak, and determines a sample window spanning a local maximum and minimum for each period of the quantized periodic signal.

一种高速模拟数字转换器测量方法，采集和量化由DAC输出的相应于数字斜坡输入的模拟斜坡以产生量化的斜坡，确定量化的斜坡的开始和结束，获得量化的斜坡和理想的斜坡之间的差值以产生量化的周期信号，从量化的周期信号的FFT中确定合格峰值的频率，从合格峰值周围的iFFT中产生屏蔽过滤的周期信号，并且在量化的周期信号的每一周期内确定跨越局部最大值和最小值的采样窗口。

The generation methods of the special OAM are introduced, including superposing the beam lights with special phase and frequency, computer-generated hologram and mode converter.

介绍了具有轨道角动量的光束模式的生成方法：一、具有特定相位以及频率关系的光束模式的叠加；二、计算机生成的全息图；三、模式转换器。

High frequency emergency lighting apparatus for telecommunication power system is proposed in this paper. The proposed circuit configuration comprises an electronic ballast, a line voltage detector, and a charger/discharger. To compact the system structure and raise the efficiency, the class E inverter and bi-directional converter are employed, respectively.

本文中主要提出一种应用於电信电源供应系统之高频紧急照明装置，所提之架构包括采用E类换流器为主电路之电子安定器、市电侦测电路及单级双向充放电电路，其主要特徵是电路简单、维修容易且具高效能。

Experimental results prove that the shunt APF system with cascade multilevel converter based on CPS-SPWM can achieve excellent compensation effect even under much lower switching frequency. We can easily get to the conclusion: this method has a perfect prospect in industry application.

通过一系列实验验证了将基于CPS-SPWM技术的级联型多电平变流器应用于APF上能较好地实现对非线性负载引起的谐波及无功污染的补偿，有良好的工业应用前景。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。