环境噪声

Position parameters were obtained from the simulation with the model of towed array.Based on the theory of radiated noise forming, the launch noise was simulated according to test condition in Laboratory,and the result showed the launch impulsion noise obeyed SαS distribution. The simulated noise attenuating in deep sea was analyzed with a sound loss translation model.Minimum variance distortionless response,spatially smoothed MVDR, and beam-space multiple signal classification algorithm were adopted to process the signal, hence the source level, the frequency structure and the location of the launch noise were achieved.

基于试验的实际情况，根据潜艇拖曳阵模型，仿真生成了各水听器阵元与本艇的位置关系；根据噪声源理论模型分析产生雷弹发射模拟噪声，利用SαS分布模拟武器发射冲击噪声，仿真分析模拟噪声在海洋环境中的传播衰减，对阵元信号分别利用最小方差无畸变响应法（MVDR 、空间平滑MVDR以及适应子带的波束域多重信号分类算法进行信号处理，得到发射噪声的声源级、频谱结构和方位。

Low-level noise can cause higher probability of subjective annoyance. It"s very slightly to people"s health, sleeping and working about the low frequency noise. It was compared with the high frequency noise caused by traffic about sleep, work and rest.

研究结果表明：居住区低频低噪声引起的烦恼度不容忽视，在低频低噪声环境下仍能引起较高的烦恼概率；低频低噪声对人的睡眠、行为及主观生理不适感有影响；低频噪声烦恼度与中高频噪声烦恼度的研究结果在对睡眠、工作及休息上有差异。

Its main function is to produce radar echoes, clutters and noise. Its used for radar subsystems debugging when the microwave frontend is not available.

它的主要功能是用来产生目标的回波、杂波和环境噪声，在前端电波不存在的情况下对雷达分系统进行调试。

Moreover, the scheme gives a new guideline of thought to reduce the computation for demodulating.

多址干扰、多径干扰、远近效应和环境噪声是这种系统的主要问题。

Our live and work are more and more crowded,and used more and more cars and machines ,so

人们生活，工作越来越拥挤，越来越多地使用各种汽车和机器，因此环境噪声日益严重。

Proper structure design of the infrasonic monitoring arrays is an effective means to restrain the environment noise and enhance the target infrasonic signal.

次声监测台阵结构的合理设计是抑制环境噪声及增强目标次声信号的一种有效手段。

Compared with the prior art, the invention has the advantages that:(1) the active neural microelectrode integrates signal collection/processing and stimulation function in the same preposed signal processing chip, which can reduce the disturbance of environmental noise, inhibit the attenuation caused by parasitic capacitance, filter polarized voltage and greatly improve the speech-noise ratio and stability of the whole microelectrode; and (2) the active neural microelectrode integrates digital logic control and stimulation circuit in the chip, so as to reduce the amount of output leads and simplify the complexity of subsequent circuits.

本发明相对于现有技术具有如下突出特点：(1)将信号的采集，处理以及刺激功能集成在一个前置信号处理芯片上，不仅减少了因为环境噪声的干扰，而且很好的抑制了寄生电容引起的衰减，滤除了极化电压，大大增强了整个微电极的信噪比和稳定性；(2)同时，将数字逻辑控制和刺激电路也集成在此芯片上，减少了输出引线的数目，简化了后续电路的复杂性。

A method is proposed by separating ambient noise signal and withdrawing the early-time multi-breakdowns of diesel engine based on natural gradient algorithm in the case that the number of vibration sources is unknown.

提出一种在振动源个数未知的情况下，采用自然梯度算法分离环境噪声信号的同时提取柴油机早期多故障的方法。

This working stability of instrument , performance are good, smaller than 1dB through correcting the error of measuring, it is 40 to measure the range --96dB, can meet general civil need , can apply industrial and mining enterprises , organ school ,etc.

该仪器工作稳定、性能良好，经校正测量误差小于1dB，测量范围为40——96dB，能满足一般民用需要，可广泛应用于工矿企业、机关学校等需要对环境噪声进行测量和控制的场合。

Also said driving, tried to play the version only to provide NESSION 350Z, but some four kind of different color different re-equipping edition chose (partner for you to think this vehicle buttocks oversized, kept off line of sight very much), had under the QUICKPLAY pattern around the city and drifts two kind of patterns: The around the city pattern is four Che Bishui arrives the end point most quickly, this racecourse is not very long, but has several S curves to need to be careful, the vehicles were inferior the previous generation easy to control, feel and NFS5 are similar, belong to the design quite real that kind, when immediately is turning around in particular front of a train if you hold down the acceleration key not to put the automobile to be able in-situ to spin, discharges the big group the smog, the air vent also can torch.

游戏的音频似乎没有特别值得关注的地方，大部分是赛车发出的声音，诸如发动机的轰鸣声和刹车时轮胎摩擦地面发出的声音等，音乐和环境噪声相当的低，有3首歌供选择，还是那种动感十足的 Hiphop 曲风。再说说驾驶，试玩版只提供了一辆 NESSION 350Z ，不过有四种不同颜色不同改装的版本供你选择(偶认为此车屁股过大，很挡视线)，在 QUICKPLAY 模式下有环城和漂移两种模式：环城模式还是四辆车比谁最快到达终点，该赛道不是很长，但有几个 S 弯道需要小心，车辆不如上一代易控制，手感和 NFS5差不多，属于设计比较真实的那种，尤其是在马上掉转车头的时如果你按住加速键不放汽车会原地打转，排出大团的烟雾，排气孔还会喷火。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。