背景噪声

However, little is known about the effect of weak background noise on the detection of acoustical signals in animals.

平时被人们忽视的弱背景噪声是否影响动物的声信号的检测，其神经机制是什么，还未见相关的研究报道。

An adaptive filter based on Data-Reusing Least-Mean-Square algorithm has been proposed and applied in magnetocardiography to suppress ambient noise.

提出了一种基於数据重置最小均方算法的自适应数字滤波器，并将其应用於抑制心磁信号的背景噪声。

A MMSE multiuser detector alleviating edge effect with low complexity is proposed and its asymptotic efficiency,"near-far" resistance and computational complexity are qualitatively analyzed.

该检测器缓解了异步系统因截断处理而受到边缘数据的影响，在抑制多址干扰以及背景噪声上获得了优异的性能折中。

HR-MRI not only improves spatial resolution of the tissue, but also increases the contrast of signal intensity between intercostal muscles and pleural lesions.

对比噪声比反映的是去除了背景噪声之后的病灶信号和肌肉信号之间的差别，对疾病的鉴别诊断有一定的意义。

Traditional methods of spectral estimation were based on the assumption that the background noise is white noise.

传统的谱估计方法都是建立在背景噪声是白噪声这一假设基础之上。

Then it made denoising and edge detection for the CT image of the brain aiming at the properties and keystoned of CT image. In the process of denosing for CT images of the brain,because it has some characteristics,such as the biomedical signal is a typical non-stationary signal with a strong noise in background,it is more difficult to resolution.

在对脑部CT图像的去噪处理过程中，本文针对生物医学信号是典型的非平稳信号，具有很强的背景噪声，处理起来较困难的特点，引入了一种基于EMD方法的脑部CT图像去噪方法，它可以有效地去除噪声的干扰，充分保留信号的局部特征。

Under the condition of varying , the ratio between noise levels in local sensors, this dissertation derives the analytic expression of performance of the centralized OS-CFAR detection for and local signal-to-noise ratio in nonhomogenous background.

本文在局部传感器背景噪声功率水平间的相对比例系数变化情况下，推导出了集中式 OS-CFAR 检测在且局部观测信噪比条件下在非均匀杂波背景中检测性能的解析表达式。

The results of simulation indicate that the discrimination capacity of more than 99% and 96% respectively can be obtained when the input image is destroyed by nonoverlapping background noise and substitutive noise under the proposed technique.

仿真实验结果表明：当输入图像受到非覆盖性背景噪声影响时，识别度表现平稳，能够维持在99%以上；当输入图像受到替换噪声影响时，识别度能够达到96%以上。

On the base of analyzing the main factor to the erroralarming in LPMS,the alarming theory in view of wavelet's RMS was established by choosing minor scale of relative noise as alarming datum point,and the base noise which affect alarm was checked effectively.

在分析LPMS中产生误报主要原因的基础上，结合小波时频域分析特点，提出了基于小波均方值报警理论，并以秦山核电站一号机组为例，选择相对噪声较小的尺度作为报警基准，能有效地抑制背景噪声对报警的影响。

A new method for two-dimensional parameter estimations of near-field sources in the presence of impulsive noise is presented in this paper.

本文针对背景噪声为冲击噪声的情况，提出了一种新的近场源二维参数估计方法。

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。