射频信号

该系统利用DSP实现数字立体声调制，并通过AD9852DDS芯片将数字信号转换成射频信号。

The digital stereo modulation is implemented by DSP , and the digital signal is transformed to RF signal by AD9852 .

USB设备系统主要负责射频信号的处理，信号采集以及与上位机通信等功能。

The hardware system is mainly responsible for the RF signal processing , signal acquisition and host computer communication .

首先，本文从信号处理的角度系统的描述了MRI射频信号收发器的原理和算法。

Firstly , the principles and algorithms of MRI signal transceiver were described and designed .

应用于接入网段的低成本OFDM射频信号光传输系统的研究

Study on Performance of Low Cost OFDM-RoF Systems in Access Networks

扩频通信是扩展频谱通信（SpreadSpectrumCommunication）的简称。它是指用来传输信息的射频信号带宽远大于信息本身带宽的一种通信方式。

Spread spectrum communication is a communication way of transmitting information with much wider bandwidth of radio-frequency signal than that of the information signal itself .

金属介质对射频信号的干扰一直以来影响着射频识别技术（RFID）的有效应用。

Disturbance of metal media on radio frequency signal is always influencing the effective application of RFID .

基于PLL技术的射频信号数字调谐系统的分析设计

Analysis and Design of RF Signal digital Tuning System Based on a PLL Technology

正因为这样，才使SAW滤波器在电子信息领域中得到了越来越广泛的应用，特别是应用于高频端RF射频信号滤波。

Because of these , SAW Filter is more and more comprehensively applied in electronic information field , especially in RF signal processing field .

本文介绍了利用DDS来产生线性扫频信号的射频信号发生单元的设计。

This article describes the design of a linear sweeping frequency signal generator using DDS technology .

RFID技术使用射频信号通过空间耦合的交变磁场或辐射电磁场进行传输，根据其负载的信息，实现通信及识别目的。

RFID uses RF signals through space coupling an alternating magnetic field or radiated electromagnetic fields to achieve communication and identification .

给出了一个低功耗、高频CMOS峰值检测电路，可以用于检测射频信号和基带信号的峰值。

A low-power , high-frequency CMOS peak detector is proposed . This detector can detect RF signal and base-band signal peaks .

基于ARM7的电离层测高仪射频信号源的设计与实现

Design and Implementation of RF Signal Sources for Ionosonde Based on ARM7

提出以信号混频为基础，通过DDS与集成锁相环（PLL）技术相结合的新型射频信号合成方案。

Based on signal mixed frequence , it gives a new RF signal synthesizing plan combining DDS with PLL .

基于PIN二极管开关电路在射频信号切换方面的特性，设计了一种应用于滤波器切换的PIN电子开关电路。

Based on characteristics of PIN diode switch circuit in RF signal switching , a PIN electronic switch circuit is designed to perform filter switching .

本文应用互相关技术在阵元接收射频信号信噪比（SNR）不同情况下，对部分阵元参考法校正超声成像相位畸变进行了仿真实验。

A computer simulation for phase aberration correction is conducted , based on the method of partial array reference , cross-correlation as cost function .

RFID技术利用射频信号通过空间耦合（电磁感应或电磁传播）的方式来实现信息无接触式传递并且与标识物进行信息的交换以达到识别物体的目的。

RFID technology uses radio frequency signals to realize objects and transfer information through space coupling ( electromagnetic induction or electromagnetic transmission ) without any contacting .

Morlet小波用于高分辨率的射频信号检测时的参数设置

Parameter Setting of Morlet Wavelet Using in High Frequency Signal Detection of High Resolution

RFID系统利用射频信号通过空间耦合进行双向信息传输，实现对待识别物体的自动识别和数据采集。

RFID systems achieve auto-identification and data-gathering of the object to be identified by utilizing space coupling of radio frequency signal to conduct two-way transmission of signals .

天线是RFID系统射频信号发射与接收的主要设备，在很大程度上影响着RFID系统的性能，因此研究RFID天线技术具有重要的理论与实际意义。

Antenna is the main equipment for radio frequency signal transmission and reception in RFID system and it has a big influence on the performance of RFID system .

RFID技术是一种自动识别技术，它通过射频信号可自动识别目标对象并读取相关数据，无需人工干预。

RFID is an automatic identification technology . It can automatically identify the target object and read the relevant data through the RF signal , without human intervention .

把传感器和RF发射器直接安装在轮胎内，采集各个轮胎当前时间的气体压力数据，经调制后再以无线射频信号发射给车厢内的数据接收模块；

The stress sensor and RF emitter is installed in car tire , it is transmited for receiver installed in car by wireless after gas stress data gathered is processed .

RDSS射频信号耦合寄生小信号技术分析

Analysis of the Parasitic Small Signal Coupling with RDSS RF Signal

超声背向散射积分（IBS）技术是新近发展较快的一项超声组织定征技术，基于超声背向散射原理，通过分析、处理组织散射的射频信号来判断组织特征。

In recent years , integrated backscatter ( IBS ) imaging technique has been proposed as a new method of ultrasonic tissue characterization .

该变频器采用平衡变频结构，变频电路主体为平面结构，同时采用了E面探针结构的波导微带转换作为射频信号输出。

The converter utilizes the balanced structure , the main structure of the converter is planar . An E plane transition from waveguide to micro strip is also designed for the output of the RF signal .

输入ROF系统的电信号可以是基带数字信号、中频信号和射频信号。

The input electrical signal in ROF system may be base-band digital signal , intermediate-frequency signal or radio-frequency signal .

数值模拟了基于电吸收调制晶体（EAM）的超短光脉冲源的输出脉冲宽度及消光比与外加反向偏压、射频信号幅度之间的变化关系。

The characteristics of an ultrashort optic pulse source based on electroabsorption modulators are investigated by means of numerical simulations .

在上变频环节中，与DDS器件合成的多普勒频率信号进行混频得到雷达目标的射频信号。

Then it mixed with the Doppler frequency which is synthesized by the DDS to achieve the radar target radio frequency signal in the upward frequency conversion process .

通过采用了一种改进型的Gilbert双平衡混频器结构，这种结构可以实现射频信号功率和噪声的同时匹配以达到提高噪声性能指标的目的。

A Gilbert topology has been modified to provide RF power and noise matching , in order to improve the overall noise behavior .

然后以VHF波段信号检测为例，研究如何设置小波参数来提高频率分辨率，并用Matlab来仿真射频信号。

Then taking the signal detection of VHF wave band for example , studies how to setting wavelet parameter to improve resolution of high frequency and using Matlab to simulate RF signal .

创新的自动频率扫描功能，使系统能自动扫描UHF频段，然后从话筒的发射机射频信号最强。

The innovative Auto Frequency Scan function enables the system to automatically scan the UHF frequency band and select the strongest RF signals from the microphone 's transmitter .