查询词典 SNR

The ADC and SNR of centrum semiovale,cingulate gyrus,thalamus, genu and splenium of corpus callosum were calculated separately,and were compared on both conventional DWI and FLAIR-DWI.

结果：扣带回和胼胝体压部的ADC值在施加FLAIR脉冲后显著下降，而半卵圆区、丘脑及胼胝体膝部在施加FLAIR脉冲前后无明显变化；5个部位的DWI图像信噪比在施加FLAIR脉冲后均显著下降（P〈0.01）。

Simulation result shows that, compared to the two methods based on minimax theory and stein unbias similar estimate theory respectively, the SNR of the pulsar signal of the proposed algorithm is increased by 5 to 6 dB while keeping the details of it.

实验结果表明，与基于极大极小原理和Stein无偏似然原理的降噪方法相比，基于模糊阈值的小波降噪算法将脉冲信号的信噪比提高了大约5~6dB，同时可以保留信号的细节。

A new style CFOA was proposed in this paper, the compens AT ion circuit elimin AT e the imbalance between the two input in st AT ic condition,the PMOS and NMOS complementary input structure enhance SNR,Simul AT ion with 0.6 CMOS process parameters,result in a high SR as well as bandwidth gain-independence.

本文提出了一种新型的电流反馈形运算放大器，该电路所具有的电压补偿电路克服了以往基于CMOS的CFOA两个输入端静态条件下不平衡的缺点；NMOS与PMOS互补的输入结构提高了电路的信躁比。

Curves for the BER are obtained based on the derived SNR at the output of the equaliser.

误码率曲线的基础上得到的衍生的输出信噪比的扳平。

On the one hand, de noising of instantaneous parameters is optimized by a wavelet filter, which can improve the recognition ability under the low SNR; on the other hand, the existing three feature parameters σ,σ(subscript ∞) and σ are used, and three new parameters Ra, Rp and Rf are proposed based on the existing feature parameters, which can simplify the process and improve the recognition ability.

该算法一方面提出采用小波滤波器对信号的瞬时信息进行消噪处理，提高了调制识别算法在低信噪比下的识别能力；另一方面利用已有算法的3个特征参数σ、σ、和σ以及在已有算法基础上改进的3个新的特征参数Ra、Rp和Rf，简化了识别过程，改善了低信噪比下的识别效果。

Beginning with raising the signal noise ratio of the global identification, the global identification method weighted with modal shapes is presented, which permutes and composes the elements of FRF in the form of the sum of modal shape squares and obtains global modal parameters with relatively high SNR.

本文在综合分析现代模态分析领域国内外现状的基础上，以学科的一些难点为研究对象，对系统模态参数识别、动态建模、动态修改领域存在的问题进行了广泛深入的研究，取得了一系列独创性的研究成果。

Discrete Ambiguity Function is used to estimate parameters of LFM signal after improving SNR based on recomposing sequences.

摘要提出了一种基于序列重组提升输入信噪比，然后利用离散模糊函数估计LFM信号参数的新方法。

Simulation results show that a SNR gain of around 3 dB can be obtained by using antenna array.

并在两接收天线的情况下，研究了次优算法的识别性能，仿真表明次优算法在两接收天线时约有3dB的信噪比增益。

By the balance of communication link power, SNR balance guidelines and BER balance, under the base to meet the requirements of systems and not affecting thequality of call. Finally, the open-loop/closed-loop variable step length reverse power control is introduced, its principle is under the original open-loop power control to select suitable power control step by the new power control bit, and achieves a balanced system fastest and most effective.Keywords: Step, Power-control, Brethren interference, Proximity effect

依据通信链路的功率平衡准则、信噪比平衡准则和误码率平衡准则，在满足系统要求和不影响通话质量的基础上，最后提出了开环/闭环可变步长的反向功率控制，其原理是在原有的开环功率控制的基础上，依据新的功率控制比特，来选取合适的功率控制步长，以最快、最有效的方法使系统达到平衡。

Finding out the major concentrated frequency band of tool-wear information can enhance SNR and improve tool-wear degree recognition result.

找出刀具磨损信息在可听阈内的主要集中频段能提高切削声信号的信噪比，改善识别结果。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。