环境噪声

Aimed at rapidity and low power consumption required by intelligent mines,based on correlation theory and pattern recognition technology,a new method is given,in which helicopter noise signal of time domain is analyzed directly,that is to estimate fundamental frequency by calculating self-correlation function,then recognize target thinking of the fundamental frequency as characteristic quantity.

预警识别是被动声探测的关键技术之一，其作用是探测环境噪声信号作为预警信号，当直升机或其它目标出现时，传声器检测到的声能首先被转化为一定幅度的电压信号，电路通过判断信号的大小和其它特征来确定是否出现直升机目标。

The experimental results show that the method of this paper is effective on gauss white noise and real environmental noise.

对于含有真实环境噪声的带噪语音，该方法能获得比基线系统更好的性能。

The ambient noise is uniformly insulated between 125 Hz and 2000 Hz, averagely insulating sound about 22 dB, by the isolation booth, and that fits in with the spectrum and SPL of stored grain insect action sound.

实验表明，在125~2000Hz的频带范围内，隔声室能均匀隔离环境噪声，平均隔声量为22dB，可满足储粮害虫活动声的频率范围和声压级要求。

The status of mobile communication in coal mine underground is introduced, the difficult technical problems including laneway infection for wireless transmission and weak signal reception and noise interference are analyzed, and ways to solve these problems are proposed.

介绍了我国煤矿井下移动通信现状，分析了技术上的难题-巷道对无线传输的影响、弱信号接收和井下环境噪声干扰，提出了解决途径。

Article III of this Law is applicable to the prevention and control of environmental noise pollution ...

第三条 本法适用于中华人民共和国领域内环境噪声污染的防治。。。。

While developed, following phenomena are considered: the characteristics from psychophysics of hearing, one word with one syllable in Chinese, the acoustic model of speech not strictly being consistent with its linguistic model during recognition and the influence of ambient noise on the performance ...

为此， 在系统的开发过程中，考虑了人类语音交互的听觉感知特点、汉语的一字一音节特点、具体识别时语音的声学模型不必与其语言学模型严格一致的特点以及环境噪声对系统性能的影响等，提出以过渡段+韵母段作为识别基元，采取多层识别策略进行识别。

The noise spectrum level of the sallow sea in north sea of our country has been predicted by this model.

在声呐作用距离预报或信号处理方案设计中，需对海洋环境噪声场的时空统计特性进行预报。

Biomagnetic measurements generally require expensive equipment and shielded rooms to make sure you are not detecting noise from the electromagnetic environment.

生物磁场测量一般需要昂贵的设备，屏蔽室，以确保您不检测的电磁环境噪声。

Construction or other work that causes noise pollution to the environment is discretionarily carried out within the limited time

一、在限制时间内擅自进行建筑施工等产生环境噪声污染作业的

Its main function is to produce radar echoes , clutters and noise .

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。

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。