For wireless digital communications, digital user signal is usually at first converted into analog domain and then modulated to radio frequency by one or two steps.
对于无线数字通信而言，通常将数字用户信号首先转换到模拟域中，然后通过一个或两个步骤将其调制到无线电频率。
Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.
相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。
Combining two methods, it is detected and analyzed that the weak signal slowly frequency change accompanied by noise.
结合所提出的两种方法，对带噪声的频变微弱振动信号进行了检测分析。
When the signal spectrum falls into two or more channels, a method of spectrum assembling in frequency domain is used to obtain the positive or negative half spectrum.
在频域中当信号频谱处于两个或更多个滤波器通道时，通过频谱组合办法直接得到实信号的正半谱或负半谱。
Two kinds of typical wideband signal, Frequency Modulation (FM) signal and Frequency Spread signal, is analyzed qualitatively with wideband Ambiguity Function.
以宽带模糊度函数为工具定性地分析了两类典型宽带信号，即调频信号和频率分集信号。
Two kinds of signal processing methods for heterodyne interferometer, phase locked frequency demodulation and combinatorial frequency demodulation are presented in this paper.
介绍了两种激光外差干涉信号的处理方法锁相频率解调法及组合频率解调法。
Based on the signal characteristic of frequency agile and coding, the processing of range will be carry out in two kinds of methods.
根据信号的跳频和编码特性，距离的处理可以用两种方法实现。
Relatively familiar with the time domain, frequency domain is very helpful to understand and master the many effects of signal integrity between the two can be FFT conversion.
时域相对比较熟悉，频域则非常有助于理解和掌握许多信号完整性效应，两者之间可通过傅立叶变换相互转换。
The frequency and amplitude and phase of discrete spectral lines can be calculated through two DFT analyses one after another, which is one complex time domain signal analysis virtually.
相继两次DFT分析（实为一次复时域信号分析）可精确确定诸分立谱线的频率、幅度与相位。
According to the characteristics of ut signal, this paper puts forward two ways of digital decoding: Time Domain Analysis and Frequency Domain Analysis.
根据UT信号的特征，从时域和频域角度提出了两种数字译码方法。
Center frequency and bandwidth are two significant parameters in signal processing, which catch our attention in engineering application and took a long period for researching.
在信号处理中，中心频率和带宽是两个至关重要的参数，它们在实际工程中的应用引起了人们的广泛关注。
At least two of the filter elements cooperatively form a differential output signal based on their respective frequency components.
至少两个滤波元件共同作用形成基于它们各自频率成分的差分输出信号。
Each module is controlled by voltage current two closed loops. The common voltage loop controls system output voltage & frequency, and generates a common reference current signal.
三台航空静止变流器模块均为电压、电流双环控制，通过公用电压调节器稳定并联系统的输出电压及频率，同时产生统一的模块电流给定信号。
Firstly, the best wavelet basis selection was conducted via message entropy function; then the gas load was decomposed to low frequency signal and high frequency signal by two times through it.
首先用信息熵函数最小选择最优小波基，然后用其对燃气负荷进行二层分解得到负荷的低频信号和高频信号。
The frequency, electromagnetic, Sparks, electrostatic interference, the two sensors have two polar same signal.
频、电磁、火花、静电等干扰，则使两个感应器产生两个极性相同的信号。
A new kind of binary phase codes two frequency cascade PN intercepted codes (TFCPIC) is presented, and its signal processing is also discussed in detail.
本文提出了一种新的二相编码波形-双频级联pn截断码，并对其信号处理作了详细讨论。
Two major points are discussed about the design of sampling frequency change :the interpolation of the signal of integer and reslization of MATLAB ;
在频率转换的设计过程中主要讨论了两个问题，其一是信号的整数倍内插及MATLAB实现；
The realization of the project is mainly composed of two parts. The first part is low frequency signal generator based on DDS, and the second part is high frequency signal synthesizer.
该方案的实现主要包括两大部分，其一是低频dds信号产生部分，其二是高频信号合成部分。
Based on DDS technique, the signal generator can create two signals, i. e. the sinewave and the square wave signals, and its amplitude, frequency and phase can be continuously adjusted.
采用直接数字合成（DDS）技术构建双路正弦波及同步方波发生器，实现幅值、频率、相位等连续调节；
The spectrum of amplitude modulated signal are two half magnitude spectrums of base band signal positive and negative shifted by a carrier or R. F. frequency.
调幅讯号之频谱为一半强度基频讯号之频谱分别正负位移一射频或载波之频率。
The localizer is composed of two parts:a constant current constant frequency signal source and a signal detector.
装置由恒流信号电源和信号检测装置两部分组成。
This controller's input signal is the voltage phase Angle difference between two areas obtained by PMU, which can effectively reflect the inter-area low frequency oscillation characteristics.
该控制器以PM U得到的区域间电压相角差信号作为输入信号，能够直接有效地反映区域间低频振荡特性。
We have mainly researched two FM signal demodulation techniques called Frequency Spectrum Separation and Phase Lock Loop in the first part.
一次解调中研究了频谱分离法和锁相法两种实现鉴频的技术。
The nonlinear vibration characteristics of resonant silicon microstructure pressure sensor are investigated under single and two frequency excitation signal conditions.
本文研究了谐振式硅微结构压力传感器在单频激励和双频激励情况下的非线性振动特性。
Each module is controlled by voltage-current two closed-loops. The common voltage loop controls system output voltage & frequency, and generates a common reference current signal.
每台航空静止变流器模块均为电压、电流双环控制，通过公用电压调节器稳定并联系统的输出电压及频率，同时产生统一的模块电流给定信号。
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.
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。
In this paper, two kinds of new time-frequency analysis approaches for non-stationary signal processing are introduced, which are wavelet transform and short-time Fourier transform.
本文介绍处理非平稳信号的新型工具——小波分析、短时付氏变换两种时频分析方法。
The two signal sources are jointly controlled to produce a three-item square-wave pulse synchronous frequency conversion and voltage regulation signal source.
两信号源统一控制便产生三项方波脉冲同步变频调压信号源。
Radio frequency signals from two different tire transmitters are received and tire identification and location are determined based on radio frequency signal strength.
以及接收来自两个不同的轮胎发送器的射频信号，并根据射频信号的强度确定轮胎标识和位置。
Radio frequency signals from two different tire transmitters are received and tire identification and location are determined based on radio frequency signal strength.
以及接收来自两个不同的轮胎发送器的射频信号，并根据射频信号的强度确定轮胎标识和位置。
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