环境噪声

The analysis of lake experiment's data validate the supposing model of vector sensor and some theories, including the dropping noise-field analysis, the distance testing, the biasing phenomenon of bearing-time course and the spectrum comparison between acoustic intensity and pressure.

湖试数据的实验分析，验证了矢量传感器的模型假设及其部分理论和现象，包括"雨滴"噪声场分析、"拉距"实验分析、方位时间历程的有偏现象以及声强谱与声压谱的比较，其间提出的5种谱级信噪比的估计方法，适用于实验环境的评估。

Considering the complex environment of power line carrier communication, this paper proposes and implements a computer simulating system, represents the simulation algorithm for dynamic model and noise, as well as an application example.

针对低压电力线载波通信的复杂环境，本文提出并实现了一种计算机仿真系统，给出了动态模型和噪声的仿真算法，以及具体应用的示例。

Due to its smaller computus, faster convergence rate and smaller misadjustment, and its performance is not influenced by existing uncorrelated noise, the proposed algorithm can be applied perfectly in the adaptive noise cancellation system and achieves favorable performance in lower SNR situation.

该算法计算量小、易于控制，具有快速的收敛速度和较小的失调，不受已存在的非相关噪声的影响，可很好地应用于自适应对消系统中，且在低信噪比环境中仍能保持良好的性能。

In the presence of impulsive noise,the two received signals are combinated,so the estimated impulse response of the channel is the eigenvector of its covariation matrix corresponding to the smallest eigenvalue,which can be realized adaptively using generalization o.

该算法在脉冲噪声环境下，组合两个接收信号，使其共变矩阵最小特征值对应的特征向量为信道的估计，并基于广义归一化最小平均p范数方法自适应得到该特征向量，从而获得时延估计。

Ultrasonic measurement method is a new one. It has many advantages, such as, not changing the profile of the flow and characters of the fluid, non-invasion, no pressure losing and can work under the severe conditions. Collecting the flow noise signals at the upstream and downstream of the pipe, adopting the cross correlation method to analysis signals, calculating the cross correlation function and finding the peak of it, then we can get the transit time.

超声波流量测量具有不改变流动状态与性质、非接触、耐恶劣环境等优点，通过对所采集的上、下游流动噪声信号进行相关分析，其互相关函数的峰值位置所对应的时间，为流体流过上、下游传感器之间的距离所用时间，进而计算出流速和流量。

On the basis of short time energy and short time cross zero rate,a simple voice activity detection model on G.729 is presented.Some adjust methods are discussed for the model to adapt to different environments automatically.

提出了一种运用短时能量和短时过零率两个参数进行静音检测的模型，针对不同情况下的语音数据动态调整模型，实现了不同噪声环境下对语音片段的有效检测。

It is for overcoming the noisy environment that digital transmission provides a powerful method.

数字传输正是为克服这种噪声环境提供了一种有力的方法。

It is digital transmission that provides a powerful method for overcoming the noisy environment.

正是数字传输为克服这种噪声环境提供了一种有力的方法。的方法。

Some small merchants sell the vegetables fruit fish flesh around our school, they even hawk attract passer-by's attention, just like we know, has a peaceful environment to us is extremely important, but we hear their noise in the classroom, but cannot hear teacher's sound clearly, they cause the street to change more importantly are unable to withstand dirtily, stink to high heaven, road congestion, therefore I write a letter for you in order to enable the condition to obtain the change for the better!

一些小商贩在我们学校周围卖蔬菜水果鱼肉，他们甚至叫卖来吸引路人的注意，正如我们所知，对我们来说有一个安静的环境是非常重要的，但我们在教室里听到他们的噪声，而不能清楚听见老师的声音，更重要的是他们使街道变的肮脏不堪，臭气熏天，道路拥挤，因此我写信给你为了使状况得到好转！ the end 谢谢！辛苦了

At present, most of the DOA estimation algorithms are used in the Gaussian noise environment.

目前，大多数的DOA估计算法是应用在高斯噪声环境下的。

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。