查询词典 frequency function

Under the basis of these, the lately widely used wavelet transform in DSP is used to wipe off the noise in the band of the signal frequency. Lastly, for its function of auto noise-resistance and double integral, the triple correlation is also used to improve the sensitivity of the receiver.

在此基础上，为了提高系统在低信噪比下的相关检测能力，采用了近来在信号处理中获得广泛应用的小波变换来去除信号频带内的噪声，并用三重相关对噪声的自动抑制作用和对信号的双重累积作用来提高接收机对回波信号的接收灵敏度。

ABSTRACT: A Rockwell PowerFlex7000 Variable Frequency Drive is used in JiuZHou Electric medium voltage drive test bay as the converter. Because of it belong to the current source drive, it has the function of the four quadrant, it can achieve the energy feedbackmake the motor brake,also has the advanced vector control technology, so it can achieve all kinds of load test, there are no other drives can replace it in simulate motor load. PowerFlex7000 drive has ability to achieve the full load test before the drive leave factory.

摘 要：罗克韦尔PowerFlex7000变频器在九洲中压变频实验站测试系统中作为变流逆变器使用，由于本身属于电流源型变频器，具有四象限运行功能，能够实现能量的回馈和对电机的制动，先进的矢量控制技术，可以实现各种复杂多变的负载特性，在模拟电机负载方面起到了其他变频器无可替代的作用，实现了变频器出厂之前的满负荷测试。

Finally, on Earth-space paths, by applying a modification of the Rytov method that incorporates spatial frequency filter function under strong fluctuation conditions, a tractable model is developed for the scintillation index of a Gaussian optical beam wave that is valid under moderate-to-strong irradiance fluctuations. The scintillation indexes for collimation Gaussian beam are predicted by this analytic model, based on ITU-R C〓 model.

最后，应用强起伏下引入空间滤波函数的修正Rytov方法，发展了一种易处理且可用于从弱到强起伏地－空路径的高斯波束光波闪烁指数模型；基于ITU-RC〓模型，预测了准直高斯波束的闪烁指数，其结果和理论分析结果相符。

Since wavelet function has local features both in space and frequency domains, so wavelet analysis provides a good analysis mothed for multiresolution analysis of signal and image and effectuation and reliability of mothed have been proved by the experiment.

小波理论的发展史并不很长，但是由于它具有很多良好的性质，因此它的出现对很多领域的的研究和发展有很大的促进作用。

By mapping a one-dimensional function of time, the time-frequency representation can localize the signal energy in both the time and frequ ency directions.

通过对一个一维时间或频率信号进行变换，其时频表示能够在时间-频率平面上描述信号的能量分布。

We get appropriate threshold with mean excess function plot, get severity distribution of losses over threshold with GPD and frequency distribution with hypothesis test.

首先根据均超函数图估计出恰当的阈值，利用假设检验估计超阈值的发生强度，用广义帕累托分布估计了超限参数。

The present study was performed to observe the time course and features of intermittent tetanic contractile function changes in soleus and extensor digitorum longus muscles of tail-suspended rats. The optimal stimulating frequency, fatigability and time-dependent recovery after fatigue were measured in isolated muscle strips.

为观察模拟失重对大鼠比目鱼肌(soleus， SOL)与趾长伸肌(extensor digitorum longus， EDL)间断强直收缩功能的影响，以及对刺激频率的调节作用，采用离体骨骼肌条灌流技术，观测其产生强直收缩最大张力的最适刺激频率、疲劳性与疲劳后恢复过程。

NIICP can optimize the openloop gain to reduce intrinsic noise in the lower magnification and to recover high frequency signal damped down by the low pass transfer function of large feedback resistance and parasitic capacitance in the higher magnification.

在较低放大倍率时，改变开环增益后放大器会降低自身产生的噪声，实现低噪声；在较高放大倍率时，改变开环增益后放大器能扩展被极高阻值的反馈电阻和寄生电容降低的信号带宽。

Serial equipment department this introduce Japanese prototype of a machine is it is it , high frequency discongested , rubed the thick liquid , got rid of sand many kinds of functions to develop to improve, it suitable fors to be all chemical thick liquid , half treatment of chemical thick liquid and recycled thick liquid especially, have fibre discongest complete destroying fibring , getting thick liquid to be rate high dividing into silk broom function advantaging such as being kind.

本系列设备系引进日本样机经改进研制而成，具有高频疏解、磨浆、除砂多种功能，特别适用于全化学浆、半化学浆及再生浆的处理，具有纤维疏解完全、不破坏纤维、得浆率高、分丝帚化作用好等优点。

Spontaneous Dynamic field Exercise SDFE not only has Dynamic field from spin frequency but also has memory storage function, but not sure how it happens.

自发性动态场运动SDFE不仅有动态场来自自旋频率，而且SDFE有记忆储存功能，但不确定如何发生。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐