背景噪声

It is proved that these methods are valid and time domain filtering and noise estimation can reduce the ambient noise, and increase the signal-to-noise ratio.

结果表明：时域滤波和噪声估计方法能够较好的压制背景噪声，提高处理结果的信噪比。

Because of the intense and varying background noise in assembly plant,noises of the drive axle can not be measured.

在装配车间里一般都有很强且变化的背景噪声，无法测量驱动桥的噪声[1]。

Based on the experimental results, we analysed the sources and the proportion of background noise in biochip detection.

基于实验，文章分析了生物芯片探测过程中的背景噪声来源和各种噪声在实际探测中所占的比例。

For the different property between signal and noise in the intrinsic mode function domain, IMFs product detector is proposed. Under the condition of low SNR and the unknown distribution of noise, Simulation shows that IMFs product detector is superior to Teager energy operator detector.

利用信号和噪声在固有模态函数域中有不同的性态表现，提出了一种固有模态函数积检测器，在低信噪比和背景噪声分布未知条件下，IMF积检测器优于Teager能量算子检测器。

Based on thermal conduction theory, a thermal model is built up to get the effective thermal content and the effective thermal conductivity to be 1.0×10^(-3) W/K and 8.1 μJ/K, respectively, and the temperature-fluctuation noise is nearly 1.73×10^(-10)W/Hz(superscript 1/2). According to the device operating principle and energy equipartition theory of thermodynamics, the mechanical-thermal noise is 9.96×10^(-9) W/Hz(superscript 1/2), and the background noise is nearly 3.22×10^(-11)W/Hz(superscript 1/2), so that the normalized detectivity is deduced to be 9.03×10^6 cmHz(superscript 1/2)/W.

从理论上建立了器件的基本热模型，推导得到器件的等效热熔和等效热导分别为8.1μJ/K和1.0×10^(-3)W/K，温度噪声约为1.73×10^(-10)W/Hz(上标 1/2)；通过器件的工作机理和能量均分原理，推导得到热机械噪声的等效噪声功率约为9.96×10^(-9)W/Hz(上标 1/2)，器件的背景噪声约为3.22×10^(-11)W/Hz(上标 1/2)，从而得出器件的归一化探测率约为9.03×106cm。

By analyzing the faultiness of the wavelet method used in processing signal denoise and detection of weak signal.

通过分析小波变换处理信号噪声的方法及其在微弱信号检测方面的不够完善之处，提出适合于极低信噪比条件下小波消噪法的信号检测原理和方法，即通过构造具有可调功能的阈值函数以及对小波分解系数处理方式的优化设计等方法，在强背景噪声中提取出微弱的信号特征信息，从而实现微弱信号的检测。

According to the characteristic difference between short-time dynamic signal and stationary noise background, this paper presents a novel LMS adaptive algorithm to be whitened stationary noise background based on AR model theory of time series.

根据短时动态信号与平稳背景噪声的特徵区别，以时间序列的AR模型理论为依据，导出背景噪声自适应白化滤波器的结构，并用变步长LMS算法实现自适应滤波。

The beam quality of a LD pumped Nd∶YAG laser is measured with CCD camera system. The background characteristics of the CCD system and the influence of the size of integral box upon measurement results are investigated. The following conclusions can be derived form experimental results:(1) Background is strongly depend upon exposure time and pixel binning,while temperature has an ignorable effect upon it,whether with or without ambient light.(2) A 5%-cut is the minimum value in order to get a reasonable result.

采用CCD系统实验测量了LD泵浦Nd∶YAG激光器的光束质量参数，研究了CCD系统的背景噪声特性和积分区域选取对光束质量参数测量的影响，从实验数据中得到以下结论：（1）在有、无背景光两种条件下，背景记数强烈地依赖于曝光时间和像素的合并，温度影响可以忽略不计，（2）为获得M2合理的测量结果，至少要选择5%积分区域。

MELP vocoders utilize mixed pulse and noise as the excitation to elimate the buzzes in traditional LPC vocoders, and add a jitter voicing state to overcome the tonal noise.

MELP声码器采用混合脉冲和噪声激励解决了经典LPC的嗡嗡声的问题；引入了抖动浊音状态以克服音调噪声；利用参数插值、脉冲散布和自适应谱增强等措施提高合成语音的自然度和可懂度；此外还采用了多带激励，使其具有了比较强的抗背景噪声的性能。

Through combining background noise and measuring environment study,the effects of background noise,surface absorption of the source in different environments as well as the difference between sound intensity measurement and sound pressure measurement are emphasized.

主要将背景噪声与测量环境结合起来，研究背景噪声、声源表面吸收在不同环境中的影响，还对声强法与声压法的差别作了比较。

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。