admin 知识分享 2023-02-03

noise equivalent是什么意思

noise equivalent

noise equivalent 双语例句

The computational complexity of fast time delay MUSIC method is two orders of magnitude lower than tradition MUSIC method by rebuild received signal covariance matrix. The later proposed method build switched beam matrix according to time distribution of signal time delay, and then use Fast time delay MUSIC method to estimate time delay. The function of switch beam matrix is equivalent to time band-pass filter. The beam cover area is pass band of the filter and the noise outside the area is removed. Therefore, the later proposed method has more excellent resolving power of time delay estimation in low signal-to-noise ratio.快速时延MUSIC法通过重构接收信号协方差阵，与传统的MUSCI时延测量法相比，运算量减小约2个数量级；后一种方法根据信号时延的时间分布形成波束转换矩阵，再用快速MUSIC法做时延估计，波束转换矩阵的作用相当于一个时间带通滤波器，其中波束所覆盖的时间区域则相当于滤波器的通带，使波束覆盖时间以外的噪声得到有效抑制，因而算法在低信噪比条件下与参照算法相比具有更优时延分辨性能。
So its fill factor and responsively is high, but noise equivalent temperature difference is low.另外，针对热电偶材料选择及结构设计部份做相关公式的计算仿真，由理论分析找出一组较具代表性的感测器性能规格。
The weighted equivalent continuous perceive noise level LWECPN is adopted as airport noise rating parameters, moreover, it combines the scheduled flight, airport types and departure or approach flight paths of Xiaoshan international airport in 2005, and computes and draws the noise contours to predict the noise pollution around the airport.本文采用国际民航组织推荐的计权等效连续感觉噪声级L_作为机场噪声评价参数，通过对萧山机场2005年飞行数据资料分析，计算并绘制其噪声等值线图，预测机场周围的污染状况。
It is known by analysis that when the equivalent acoustical level is over 50dB the noise made by the railway will impact the birds` habitat and reproduction.初步分析得出铁路噪声等效声级LAeq，24h超过50dB时，会对鸟类栖息、繁殖产生影响。降低噪声源、设置声屏障、栽植降噪绿化林带是三种有效的降噪措施。
Digital image processing; Multiplying noise; Equivalent signal noise rate; Weighting数字图象处理；乘性噪声；等效信噪比；加权
Both the mathematical mode of noise equivalent temperature difference and the noise equivalent eradiation difference are established for micro thermal imaging systems.研究了显微热成像系统的噪声等效温差和噪声等效辐射率差模型，分析了显微热成像与望远模式热成像的差异。
This model is derived from Hawkins noise model commonly used in Si-BJT. The main modifications include the influence of the ideality factor, emitter resistance, intrinsic base-collector capacitance, extrinsic base-collector capacitance and other parasitic elements of HBT represented in equivalent circuit topology.该模型是对通常用在硅双极晶体管中的Hawkins噪声模型进行改进得到的，主要的改进包括发射极理想因子、发射极电阻、内部BC结电容、外部BC结电容和其它寄生元素对器件噪声性能的影响。
To scientifically predict aircraft noise and rationally estimate noise environment around airport, the standard of noise environment in China was analyzed, noise prediction model from the technical guidelines of environmental impact assessment for the constructional engineering of civil airport was studied, an aided prediction system of aircraft noise around airport was developed, in which the evaluation index of weighted equivalent continuous perceived noise level recommended by International Civil Aviation Organization was introduced.为科学预测机场周围飞机噪声，合理评价机场周围的声环境，根据中国机场周围飞机噪声环境标准的要求，结合民用机场建设工程环境影响评价技术导则所推荐的飞机噪声预测模式，采用国际民航组织推荐的计权等效连续感觉噪声级作为机场飞机噪声的评价量，开发了机场周围飞机噪声预测辅助系统。
The measure range of this instrument is from 25 dB to 138 dB, with the accuracy of ±1.5 dB and the resolution of 0.1 dB. Using the VI, it can be measured and noted that the ambient noise dB level, the transient dB level, equivalent continuous dB level and the maximum and minimum dB levels at any moment. The VI can real-time display the ambient noise signal waveform and frequency spectrum. At the same time it can give the alarm when the dB level state exceeds standard automatically and recode the correlation data.仪器可以在25~138 dB测量范围内实现±1.5 dB的精确度和0.1 dB的分辨率；实时检测并记录周围环境的声级、瞬时声级、连续等效声级、最大和最小声级；图形化实时显示噪声的时域波形和频谱；自动实现环境声级超限报警并记录相关数据。
One is auto-zero and the other is chopping. The chopping amplifier with its many parts of modulation switches, pre-amplifier, band-pass selective amplifier, and voltage follower and demodulation switches is designed. The circuit is simulated with HSPICE to optimize. The residual offset of microvolt and the equivalent input noise PSD of 70 nV /Hz were obtained.zero和斩波Chopping 对失调和噪声的影响，具体针对传感器的信号要求进行了斩波放大电路的调制，预放，带通选择放大器，电压跟随和解调等各个部分的设计，电路使用Hspice进行了仿真优化，达到了微伏量级的残余失调和70 nV /Hz输入等效噪声PSD。
Sometimes, spoken language on the radio or TV is just background noise, the linguistic equivalent of muzak.有时，电台或电视所播放的语言只是背景噪音，是与音乐传送带相对应的语言现象。
This expression may be used as an indirect testing method of noise equivalent bandpass.该表达式可用作噪声等效带宽的一种间接测试方法。
Scan efficiency η of infrared imaging system is related with the noise equivalent temperature difference of the system.1引言扫描效率η是光机扫描型红外成像系统的基本参数之一，它出现在噪声等效温差的理论计算公式中。
Noise equivalent temperature difference is one of the important specifications for measuring the performance of infrared detector systems.噪声等效温差是衡量红外探测器系统性能的重要指标之一。
Wiener filter MMSE criteria (filter output signal with the need to signal the difference between the mean square value of the minimum) the maximum output signal-to-noise criteria for the best filter criteria for the best least-squares statistical detection filter the best filter criteria in certain conditions, these best filter and Wiener filter are equivalent.维纳滤波器最小均方误差准则（滤波器的输出信号与需要信号之差的均方值最小）最大输出信噪比准则最佳滤波器最小二乘准则最佳滤波器统计检测准则最佳滤波器在一定条件下，这些最佳滤波器与维纳滤波器是等价的。
Content outline: Fundamentals of semiconductor physics; PN junction theory; Bipolar junction transistors fundamental operation, current components, gains, emitter efficiency, base transport, high-and low current effects, base-width modulation, Ebers-Moll Model, small-signal modeling, large-signal modeling, frequency characteristics, power characteristics, switch and noise characteristics; Metal-oxide- semiconductor field effect transistor MOS capacitor, basic principles of MOSFET, threshold voltage, strong inversion, weak and moderate inversion, static behavior, dynamic behavior, and equivalent circuits, metal-oxide-semiconductor field effect transistor small-geometry effects, short-channel effect, some secondary effects, SPICE Models for the MOS transistor, deep submicron MOSFET.内容概要：半导体物理基础； PN 结理论；双极型晶体管基本工作原理、电流成分、增益、发射效率、基区输运、大电流和小电流效应、基区宽度调制、Ebers-Moll 模型、小信号模型、大信号模型、频率特性、功率特性、开关特性和噪声特性；金属氧化物半导体场效应晶体管 MOS 电容器、MOS 场效应工作原理、阈电压、强反型、弱反型、静态特性、动态特性和等效电路、小尺寸效应、短沟道效应、一些二阶效应、MOS 的 SPICE 模型、深亚微米 MOSFET 。
We give the operating principle, system construction and the mathematical mode of noise equivalent temperature difference.研究了显微红外热像仪噪声等效温差和噪声等效辐射率差模型，为系统的设计提供了理论指导。
An equivalent circuit model for heterostructure LD is presented considering the case of weak coherent optical feedback effect and high photon density so as to improve the accuracy of model. Creatively cooperating the solve rate equation with the microwave network theory, a noise equivalent circuit model for LD is given so that the laser noise simulation is not only limited in calculation. In regard of the feature of high-speed low-threshold laser a new method for LD model parameter extraction is presented only by using the characteristics of near-threshold port impedance and the relaxation oscillation frequency characteristics above the threshold. On the basis of above work a quantum well laser equivalent circuit model is given compatible with heterostructure laser considering separate confinement heterostructure and thermionic emission effect.提出了一个考虑弱相干光反馈效应和高光子密度情况下的异质结半导体激光器的等效电路模型，克服了以前模型的局限性；将求解器件物理方程和微波网络原理相结合，提出了第一个实用化的异质结半导体激光器噪声等效电路模型；针对高速低阈值半导体激光器的特点，提出了一种仅利用阈值附近端口阻抗特性和阈值以上驰豫振荡频率特性来提取半导体激光器的模型参数的新方法；在普通异质结激光器等效电路模型的基础上，考虑了分离限制异质结的影响和热离子辐射效应，提出了一个和异质结激光器等效电路模型相兼容的量子阱半导体激光器等效电路模型。
The concept of equivalent absorbance is proposed. Under ideal conditons and without the consideration of noise, the sensitivity and the optical path corresponding to optimal sensitivity are derived for the absorptiometer that uses software for A/D conversion.提出了等效吸光度的概念，在不考虑噪声的理想情况下，推导出以软件完成AD变换的光电吸收式仪器的灵敏度及最佳灵敏度对应的光程。
Equivalent Additional Noise of Bearings-only Target Tracking and Adaptive Process纯方位目标跟踪附加等价噪声及自适应处理

noise equivalent

中文翻译

1
噪声的等值信号,噪声当量

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