It has analyzed the principle and the basic structure of DDS, it also has carried on the theoretical analysis to the ideal DDS frequency spectrum characteristic.
分析了DDS的工作原理及其基本结构，在此基础上对理想的DDS频谱特性进行了理论分析。
The characteristic of linear and nonlinear responses between arc excited ultrasonic emission and excited frequency was realized by the received signal from the acoustic to the ultrasonic spectrum.
对受激电弧的声发射信号分析表明，从音频到超声频带，电弧声发射与激励频率之间存在着线性响应和非线性响应特征。
Under the room temperature and Nitrogen environment (eliminate the influence of water vapor absorption), we get the characteristic absorption spectrum of GaAs within the band of frequency.
在室温去除水份影响的氮气环境中，获得了低温生长的砷化镓在该波段的特征吸收谱。
The AR spectrum is smoothness and can give exact characteristic frequency.
时序建模作出的AR谱具有谱线平滑，特征频率定位准确的优点。
The characteristic of the correlation between frequency spectrum and nugget size is studied, and the relationship is founded.
从电流信号的频谱图中寻找与熔核直径相关的特征，建立起电流频谱与熔核直径的关系曲线。
The characteristic frequency band of the fault can be identified by wavelet packet decomposition and its energy spectrum conveniently, and the quantification analysis are then performed.
应用小波包分解及其能量谱直观地识别出故障的特征频带，并进行了量化分析。
Because it is related to the magnitude of noise RMS voltage, the frequency characteristic of circuit and the power spectrum of noise source, the accuracy of measurement is quite low.
但由于与噪声电压的大小，网络频率特性及噪声源功率谱形式有关，故测量准确度较低。
The characteristic frequency band of the fault could be identified by wavelet packet decomposition and its energy spectrum conveniently, at the same time, quantification analysis were performed.
应用小波包分解及其能量谱直观地识别出故障的特征频带，并进行了量化分析。
By introducing the yielding level factor and constructing the ductility demand spectrum, the characteristic of peak values and frequency contents of ground motions are considered separately.
引入结构屈服水平系数，建立了结构的延性需求谱，使地震动的幅值特性和频谱特性可以分开考虑。
The frequency response characteristic of the tested system can be easily obtained just by giving a chaotic input and analyzing the spectrum of the output.
该方法仅需将混沌信号作为激励信号作用于被侧系统，通过计算系统偷出信号的频谱，便可获得被浏系统的颇率回应特性。
According to frequency spectrum transfer characteristic of modulation and demodulation, we think the position measurement noise is Gaussian narrowband noise.
根据调制解调的频谱转移特性，提出了有效位移噪声是高斯窄带噪声。
AIM: To detect the flow frequency spectrum of diabetic rabbits with color Doppler imaging (CDI), and evaluate the flow characteristic and occurrence mechanism of early diabetic retinopathy (DR).
目的：应用彩色多普勒技术检测糖尿病兔视网膜血流频谱，旨在探讨糖尿病视网膜病变早期血流变化的特点及其发生机制。
Then, multifractal analysis is performed for low frequency sub-band. The multifractal spectrum is used as the characteristic parameters to filter pixels which mark different scenery.
然后对低频子带进行多重分形特性分析，再将多重分形谱作为特征参量进行像素筛选，筛选出标志不同景物的像素点。
From this spectrum, one or more low-frequency signal components that are characteristic of the sample being interrogated are identified.
从该谱上识别一个或多个表征该被询问样本的低频信号分量。
Wherefore, a de-illegibility search method is proposed, according to the TDDM split frequency spectrum signal characteristic and the deficiency of usual search methods.
针对TDDM裂谱信号特性以及现有搜索方法的不足，提出了一种解模糊位搜索法。
Wherefore, a de-illegibility search method is proposed, according to the TDDM split frequency spectrum signal characteristic and the deficiency of usual search methods.
针对TDDM裂谱信号特性以及现有搜索方法的不足，提出了一种解模糊位搜索法。
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