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。
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。
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 。
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。
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。
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。
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。
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。
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。
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。
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。
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；
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。
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。
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