查询词典 noise

The former put stress on the research of time optimal control method , fuzzy discursion and moving track, and the latter on the study of EKF recursion algorithms , noise model and noise characteristic identification.

前者的重点是最优时间控制方法、模糊控制器的推理以及运动相轨迹分析；后者侧重于EKF的状态估计方法、噪声模型对滤波估计性能的影响以及噪声模型的辩识方法。

According to audio-noise meter ( 1 meter distance ) the noise level was fixed at 35.7 dB .

据音频噪声米（ 1米距离）的噪音水平，是固定的占35.7分贝。

Under the basis of these, the lately widely used wavelet transform in DSP is used to wipe off the noise in the band of the signal frequency. Lastly, for its function of auto noise-resistance and double integral, the triple correlation is also used to improve the sensitivity of the receiver.

在此基础上，为了提高系统在低信噪比下的相关检测能力，采用了近来在信号处理中获得广泛应用的小波变换来去除信号频带内的噪声，并用三重相关对噪声的自动抑制作用和对信号的双重累积作用来提高接收机对回波信号的接收灵敏度。

In this thesis, several key techniques used for the tractor drawbar and noise measuring system, i.e., parallel port communication interface techniques, high-accuracy wide-range speed measurement techniques and noise analysis approaches are studied.

文中采用了一些关键技术，如并行口通信接口技术、高精度宽量程的测速技术以及噪声分析方法等。

According on the fault mechanism of driving parts of bear box, and using the multi-resolution feature and time-frequency localization feature of wavelet transform, the fault feature signals are extracted. Besides, the noise interference is eliminated by using available noise eliminating method.

根据齿轮箱传动部件故障机理，利用小波变换多分辨率特性和时频局部化特性，提取出故障特征信号；并利用有效的消噪技术，去除噪声干扰。

It solves the problem that the unitary contour presentation can not correctly extract face contour in a face image which suffers from scale, rotation etc. The definition of the internal and external energy function is provided. At the same time, the global matching algorithm and local matching algorithm is given. The experiment shows that this presentation and the accompanying matching algorithm can be used to extract the face contour very well. So the image segmentation can be implemented by using it.②By analyzing the recognition principle of PCA method, we can conclude that the face images coming from different surrounding consist of different face image space. This is the essential reason that makes the generality of PCA method worse. Also, we give a measurement means to measure the distance from different face image space, so we can analyze face image space more conveniently.③We also construct various scale models and rotation pose models to detect the scale and rotating angle of face image to be recognized. The experiment results show that the detecting precision is very high. So it is good for face image feature extraction and face image representation.④Similarly, we construct local feature models of face image and utilize them to detect the local feature of face image. At the same time, we put forward a novel face image local feature detection algorithm, locating step by step. The experiment results show that this method can accurately detect the location of local face feature in a image.⑤A novel face image presentation model, dual attribute graph , is put forward. Firstly, it utilizes attribute graph to present the face image, then exact the local principal component coefficient and Gabor transform coefficient of thc pixels which corresponds to the nodes of the graph as the attribute of the nodes. This representation fully makes use of the statistical characteristic of the local face feature and utilizes Gabor transform to present the topographical structure of face image. So DAG has more general property.⑥Based on the DAG presentation, we give a DAG matching function and matching algorithm. During the design of the function and algorithm, the noise factor, e. g., lighting, scale and rotation pose are considered and tried to be eliminated. So the algorithm can give more general property.⑦A general face image recognition system is implemented. The experiment show the system can get better recognition performance under the noise surrounding of lighting, scale and rotation pose.

本文在上述研究的基础上，取得了如下主要研究成果：①构造了一个通用的人脸轮廓模型表示，解决了由于人脸图象尺度、旋转等因素而使得仅用单一轮廓表示无法正确提取人脸轮廓的问题，并给出了模型内、外能函数的定义，同时给出了模型的全局与局部匹配算法，实验表明，使用这种表示形式以及匹配算法，能够较好地提取人脸图象的轮廓，可实际用于人脸图象的分割；②深入分析了PCA方法的识别机制，得出不同成象条件下的人脸图象构成不同的人脸图象空间的结论，同时指出这也是造成PCA方法通用性较差的本质原因，并给出了不同人脸空间距离的一种度量方法，使用该度量方法能够直观地对人脸图象空间进行分析；③构造了各种尺度模板、旋转姿势模板以用于探测待识人脸图象的尺度、旋转角度，实验结果表明，探测精确度很高，从而有利于人脸图象特征提取，以及图象的有效表示；④构造了人脸图象的各局部特征模板，用于人脸图象局部特征的探测；同时提出了一种新的人脸图象局部特征探测法---逐步求精定位法，实验结果表明，使用这种方法能够精确地得到人脸图象各局部特征的位置；⑤提出了一种新的人脸图象表示法---双属性图表示法；利用属性图来表示人脸图象，并提取图节点对应图象位置的局部主成分特征系数以及Gabor变换系数作为图节点的属性，这种表示方法充分利用了人脸图象的局部特征的统计特性，并且使用Gabor变换来反映人脸图象的拓扑结构，从而使得双属性图表示法具有较强的通用性；⑥在双属性图表示的基础上，给出双属性图匹配函数及匹配算法，在函数及算法设计过程中，考虑并解决了光照、尺度、旋转姿势变化等因素对人脸图象识别的影响，使得匹配算法具有较强的通用性；⑦设计并实现了一个通用的人脸图象识别系统，实验结果表明，该系统在图象光照、尺度、旋转姿势情况下，得到了较好的识别效果。

For reducing such a condition and to promote the work efficiency for a dentist, in this paper, a new noise-filtered earplug system with available music is developed to filter out dental machine noise and if necessary, it can be adopted as a solution to reduce pain and anxiety of patients during treatments.

为了要来解决这样一个问题，减低病人的恐惧及全身僵硬，所带来治疗上的不便，也为了减轻牙医师的工作压力及病人对声响害怕的刻板印象，并提高诊所的工作效率。

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。

According to singular entropy and Percent of contribution to total energy, the de-noising rank is obtained and the signal is reconstructed. The thesis compares reconstruct wave form of different reconstruct rank and the error of original signal and reconstruct signal is contrasted.According to voltage flicker measurement, voltage flicker detection method based on Mathe Matical filtering and Teager Energy Operator is proposed. The multiple MM filter filters out pulse noise and white noise contained in fliker signal, then the filtered signal is tracked accurately and quikly via TEO.

提出了基于数学形态滤波和TEO能量算子的电压闪变快速测量方法，含噪电压闪变信号经过多结构元素复合数学形态滤波后，采用TEO能量算子计算跟踪电压闪变信号的包络，得到的包络信号用Pisarenco谱分析方法获得闪变调制信号的幅值频率等参数，对不同情况下的电压闪变信号进行了仿真验证。

The simulation results indicate that H_∞mixed sensitivity controller with PI current loop can improve the capability of low frequency noise enhancement and high frequency enervation in wide frequency band, and attenuate noise of torque sensor. The designed control system for EPS system exhibits good robust performances in assist tracking and anti-disturbance, greatly enhances the returnability, driver\'s steering feel, handling characteristic.

通过仿真结果分析表明基于PI电流环的混合灵敏度鲁棒H_∞控制器能在较宽频带范围内增强地面低频信号、削弱高频信号和抑制转矩传感器的噪声，所设计的控制器有较强鲁棒性，助力跟踪能力和抗干扰能力，能有效改善车辆的转向回正特性，提供给驾驶员较为满意的路感，提高车辆的转向操纵性能。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。