We illustrate the wavelet package analysis that can obtain the time-frequency distribution figure of noise signal, which can be used to define gray-image.
首先对噪声信号进行小波包分解，得到含有待诊断柴油机主轴承间隙故障信息的噪声信号时频分布图，并由此定义图像。
This article introduces the method of extending noise figure meter HP 8970a measurement frequency range.
本文介绍了扩展噪声系数表hp 8970a测量频率范围的方法。
I was woken by a loud banging noise around 2.15am. I sat bolt upright in my bed and noticed a tall dark figure standing at the bottom of my bed.
凌晨大约两点一刻的时候我又被一声巨大的砰砰声给吵醒了，我立马直起身子，注意到我床尾处站着一个巨大的黑影。
The main performances of erbium doped fiber amplifiers are the saturated gain and noise figure.
掺饵光纤放大器的主要性能是它的饱和增益特性和噪声系数。
This paper discussed the error in the measurement of noise figure—The method of Y factor , The error is caused by mismatch of RF attenuater and IF attenuater and the others in the measurement system.
本文讨论了常用的噪声系数测试方法—Y因子法中高频及中频衰减器本身失配和测试系统中其它部分的影响所造成的测试误差。
A new method of noise figure measurement is presented.
本文提出了一种新的噪声系数测量方法。
Round the feature of the ultrafast speed, make the detailed description of phase noise, receiver noise figure, launch power, threshold level of system.
围绕超高速这一特点，对系统的相位噪声、接收机噪声系数、发射功率、系统门限接收电平等作详细的论证，以确定总体设计方案。
Based on the equivalent circuit model of a two-port optical receiver front-end, the relationship between the equivalent input noise current spectral density and the noise figure is analyzed.
根据光接收机前端等效电路模型，建立了噪声系数与等效输入噪声电流谱密度的关系。
Finally, we consider solving the existence of substrate resistance and substrate resistance in the presence of the minimum noise figure.
最后还考虑了衬底电阻求解存以及在衬底电阻存在下的最小噪声系数。
We designed the LNA according to the performance index of its forward power gain, noise figure, linearity, power consumption and so on.
对低噪声放大器设计时，主要围绕正向功率增益、噪声系数、线性度、功耗等主要性能指标进行设计。
The basic requirements of the LNA include: low noise figure, enough power gain, reliable work stability, sufficient bandwidth and the wide dynamic range.
对低噪声放大器的基本要求是：噪声系数低、足够的功率增益、工作稳定性可靠、足够的带宽和大的动态范围等。
The effective noise gain of these CIRCUITs with and without CD are shown in the figure.
这些电路有CD或者没有CD时有效噪声增益，已在图中画出。
For the requirement of high gain and low noise figure (NF) of the receiver RF destination, two LNAs most be cascaded, which is determined by each noise calculation of the two different LNAs.
接收射频前端的高增益和低噪声系数要求两级低噪放级联使用，通过计算低噪放的噪声估量确定了连接方式。
The total cascaded noise figure of this receiver is as low as 1.4 dB that can help provide increased sensitivity for indoor use.
总级联该接收机的噪声系数低至1.4分贝，可以帮助提供室内使用的敏感性增加。
This paper presents a method of calculation of the noise figure of power travelling wave tubes which employ a conical Pierce gun to produce the electron beam.
本文给出了采用球形收敛枪的功率行波管噪声系数的计算方法。
The noise figure of a microwave or millimeter-wave system basically lies on the noise of the front amplifier, so the Low Noise Amplifier (LNA) plays critical role for the receiving system.
微波、毫米波系统的噪声系数基本上取决于前级放大器的噪声系数，所以低噪声放大器是接收系统中相当重要的部件。
The scheme of Noise Figure measurement best matched for this balanced LNA is proposed.
并且提出了平衡低噪声放大器噪声系数的测试方案。
Figure 8 shows how much smaller the AEE signal is compared to the common mode noise and demonstrates the necessity of using differential methods to record it.
图8示出啦aee旌旗灯号与共模噪声比拟小几，并且证实啦采用差分办法来记载它地需要性。
An example of noise removal is presented in the figure below.
下图中的噪声消除的一个例子。
At that moment there was a cracking noise, and his figure fell into fragments like a pack of CARDS.
就在这时，只听见哗啦一声，那个人像一副纸牌一样，倒了下去，变成一堆碎片。
The gain of the amplifier is also given in terms of the coupling factor and the normalized negative conductance, the relationship between the gain and the effective noise figure is thus found.
因为放大器的增益也可用耦合系数和规一化负电导来表示，因此在增益和有效噪声间获得一个单值关系式。
The methods and the experimental setups for measuring the gain and noise figure of an EDFA are emphasized.
介绍了组成掺铒光纤放大器各组件的特性测量方法，重点介绍了测量掺铒光纤（EDF）参数的方法和实验装置；
A mathematic model of funnel MCP is built. The theoretical evidence of reducing noise figure and improving the current gain is given. It will provide a theory foundation for further craft research.
建立了漏斗型MCP的数学模型，给出了降低MCP的噪声因子及提高电流增益的理论依据，为低噪声mcp进一步的工艺研究打下了基础。
As the first stage of the system, its gain, noise figure(NF) and linearity directly take effect on the whole circuit.
由于是整个电路系统的第一级，其增益、噪声、线性度等直接影响整个电路系统的性能。
In simulation, studied the noise and different surperfluous temperature how to affect the growth of dendritic and compared phase-field figure with concentration field figure.
在模拟中，研究了搅动及不同的过冷度对枝晶生长形貌的影响，并对相场和浓度场作了对比和分析。
In simulation, studied the noise and different surperfluous temperature how to affect the growth of dendritic and compared phase-field figure with concentration field figure.
在模拟中，研究了搅动及不同的过冷度对枝晶生长形貌的影响，并对相场和浓度场作了对比和分析。
应用推荐