信噪比

These results suggest that when the demagnetizing energy of soft layer is unavoidablethe application of high Ms soft layer can help to decrease the switching field,maintainthe thermal stability,improve the uniformity,reduce the thickness of interlayer andtotal recording layer,and will not worsen the signal to noise ratio.

研究结果说明当软磁层的退磁能无法避免时，使用较大饱和磁化强度的软磁层有利于降低矫顽力，保持热稳定性，提高介质的均匀性，减小中间层和记录层的厚度，并且对信噪比没有不良影响。

However, QAM has to be demodulated coherently requiring knowledge of the channel distortion on each OFDM subcarrier.

差分解调不需要信道估计，其代价是用适当的信噪比损失换取系统复杂度的降低。

In this system we improve the ratio between signal"s power and noise"s power together with the sensitivity of the system by a new temperature signal demodulating method.

在该系统中，通过采用新的温度信号解调方法，使系统的信噪比获得提高的同时，还提高了系统的测温灵敏度。

Experimental results show the correct vectors of camera are reserved while dithers are eliminated, the peak signal-to-noise ratio of smoothed video is higher than that of the original video.

实验表明该算法较好地去除了视频序列的高频抖动，同时保留了摄像机的主动运动，稳像后视频序列的峰值信噪比明显提高。

The common-mode interference is always interfused with the weak velocity signal of the electromagnetic flowmeter,which can be amplified by the signal processing circuit.

电磁流量计输出的流速信号非常微弱，且常叠加共模干扰，经信号调理电路放大后，会导致信噪比很低，甚至淹没有用信号。

How to improve the signal-noise-ratio of the received thermo-acoustic signals in terms that the irradiating microwave power should be decrease possibly is the keystone of a successful system.

如何在减小激励微波功率的前提下，尽量提高热致超声波的信噪比是这一系统的成败关键。

In this paper, the practical WDM multi-granularity traffic switching testing network is constructed and a novel method using eye diagram to monitor optical performance in the network is proposed. The method is demonstrated in the reconfigurable WDM multi-granularity traffic switching all-optical network and it results that it can realize supervision of optical signal to noise ratio, time jittering, channel power, extinction ratio and bit error rate of optical data stream of any wavelength channel in the network. The method is transparent to signal protocol and bit rates and is able to distinguish between different optical impairments.

摘要波分复用多粒度交换可重构全光网是当前光通信网发展的方向，该文构造了一种实际试验网，提出了一种&眼图法&对网中数字光信号进行全面监控的方法，并在自建WDM多粒度交换可重构全光网试验床上进行了演示，结果显示在网络重构等各种条件下均可对网中各波长通道数字信号的信噪比、定时抖动、功率、误码率等进行实时监测控制，该方法对光信号的协议和速率透明且能对各种光性能劣化进行鉴别。

The design was optimized for maximum signal intensity by simulation and experiments. The size of focal spot in the micro-channel capillary was optimized. Fluorescence signal was enhanced 2～3 times when increasing the diameter of focal spot from 10μm to 50μm (full of the inner wall of capillary), through which the sensitivity and signal-noise ratio were also improved. A technique of using refractive matching liquid was presented. The fluorescence signals were boosted up and the signal collection efficiency was also meliorated when using this method.

通过理论分析和实验优化本系统的设计：优化聚焦于微通道中的激发光斑大小，增大聚焦到毛细管内径中的激发光斑尺寸，使光斑尺寸由最小的10μm增大到50μm，光电倍增管接收到的荧光信号提高了2-3倍，从而提高系统的信噪比和灵敏度；提出在聚焦物镜处加折射率匹配液的方法，加匹配液后的荧光信号得到了增强，因而提高了荧光收集效率和灵敏度。

A theory of constrained matched filters is presented in this paper, by which the maximum output S/N ratio could be obtained under constrained conditions of nullifying clutter.

本文提出了一种条件匹配滤波器理论。条件匹配滤波器是在满足零化杂波约束条件下使输出信噪比达到最大的滤波器。

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。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。