Spontaneous Parametric Down-conversion(SPDC); correlated photon; quantum-efficiency; coincidence count;
自发参量下转换；相关光子； 量子效率；符合计数；
A quadrature down-conversion mixer based on this topology is designed and optimized for an ultra high frequency RFID reader.
设计并优化了一个基于共用跨导级结构的用于超高频rfid阅读器的正交下变频混频器。
On this basis, this paper focuses on two approaches of down-conversion decoding: spatial down-conversion decoding and temporal down-conversion decoding.
在此基础上，本文着重从空间降采样解码与时间降采样解码两方面对降采样解码处理技术进行研究。
The basic function of digital down-conversion technology is to transfer wideband high speed data signals into narrowband low speed data signals, so that DSP can process them in real time.
数字下变频技术的基本功能是将宽带高速数据流信号转变成窄带低速数据流信号，以便DS P实时处理。
For example, you can send string data in one channel with conversion enabled and send binary data down another.
例如，您可以在一个启用了转换的通道中发送字符串数据，并沿着另一个通道发送二进制数据。
We knew that if the data showed conversion rates on the new site were lower, we could then drill down and analyse data on the individual sessions and investigate why.
我们知道如果数据显示新网站上的转化率较低的话，我们就会对数据按照区域进行分类分析并研究其中的原因。
Top-down -- Start from an existing XML description of the interface (XML schema, DTD, WSDL), derive the XML data model, and generate the mapping/conversion code.
自顶向下——从现有的接口XML描述（XML模式、DTD、WSDL）开始，派生 XML数据模型，并生成映射/转换代码。
Digital down - conversion (DDC) is an important technique of digitized radar receiver.
数字下变频技术是数字化雷达接收机的关键技术之一。
The Options menu allows you to display the script to be run instead of converting, pause the script at the end of conversion, and shut down the computing when finished converting.
Options菜单允许显示要运行的脚本(而不是转换)、在转换末尾暂停脚本以及在结束转换时关闭计算。
This paper analyzes the digital down conversion (DDC) of wideband reconnaissance receiver IF digital signal based on polyphase filtering.
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。
To solve these problems, this paper presents a high performance, namely low voltage, high linearity and high conversion gain, CMOS direct down conversion mixer for UWB (Ultra Wide Band) system.
基于这种背景，本文提出了一种应用于超宽带系统的高性能（低压、高线性度、高变频增益）直接下变频混频器，采用标准的CMOS工艺设计和实现。
The following expression specifies a conversion down the hierarchy to a type that is inferred from program context.
下面的表达式指定按层次结构向下转换为一个根据程序上下文推断出的类型。
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。
Then the receiver structure and mathematical model, signal collection chip and fpga-main implementation device of digital down conversion are introduced.
接着介绍了接收机的构成和数学模型、采用的信号采集芯片及实现数字化下变频的主要器件—FPGA。
We also introduced some concept of digital radio, including digital direction synthesizer (DDS) and digital down conversion (DDC) and digital filter.
介绍了数字直接合成器 （DDS）、数字下变频器 （DDC）、数字滤波器等数字无线电经常用到的概念 。
The correlated spontaneous up conversion and down conversion photons exhibits a high beam brightness, small spatial divergence, and broad spectral tunability.
相关的自发参量上转换和下转换光子表现出光束亮度高、空间发散小以及在很宽频谱范围内可调谐等特点。
This paper deals with the design and implementation of Digital Up Conversion and Digital Down Conversion based on the field-programmable gate array (FPGA).
本文主要研究的是基于现场可编程逻辑阵列（FPGA）的数字上下变频技术的设计和实现。
One way is the parametric down conversion (PDC) and single-photons are generated either by the technique of heralding due to the simultaneity of the photon pairs.
一类是通过光学参量下转换（PDC）的方式来获取光子对，从而得到有触发的单光子源。
The conversion of nitrite is slowed down as contrasted to the conversion of ammonium ions to nitrite.
与铵离子转变为亚硝酸相比， 亚硝酸转变为硝酸是很缓慢的。
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by down frequency conversion of the receiving signal. Then the DBF is used to form the receiving beam.
在接收模式下，则利用DDS技术产生接收信号下变频所必需的本振信号，然后采用DBF技术形成接收波束。
Then, based on the overall structure of the IF all-digital demodulator for FY-2 meteorological satellite, the digital down conversion and the timing synchronization are deeply researched.
随后在风云二号气象卫星中频全数字解调器总体结构方案的基础上，对数字下变频和定时同步部分进行了重点研究。
Switching power supply Switching power supply is a voltage conversion circuit, the main work is the step-up and step-down, are widely used in modern electronic products.
开关电源是一种电压转换电路，主要的工作内容是升压和降压，广泛应用于现代电子产品。
A hybrid structure of performing horizontal DCT domain down conversion and vertical spatial domain down conversion was presented for down converting the spatial resolution of MPEG-2 video.
对MPEG - 2视频编码流空间分辨率下变换已提出了一种在水平方向上进行DC T域下变换，而在垂直方向上采用空间域下变换的方法。
By peak value sampling the information of baseband signal can be obtained from an am signal directly. By frequency conversion sampling the carrier wave's frequency of a PSK signal can be cut down.
对AM信号进行峰值采样可以直接获得基带信号的信息，对PS K信号进行变频采样可以降低其载波频率。
When the conversion is completed, it can automatically shut down your PC, and you can view the PowerPoint presentations like a movie.
当转换完成后，它可以自动关闭你的电脑，你可以查看像电影的演示文稿。
When the conversion is completed, it can automatically shut down your PC, and you can view the PowerPoint presentations like a movie.
当转换完成后，它可以自动关闭你的电脑，你可以查看像电影的演示文稿。
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