噪

National acoustic laboratories, 126 greville street, nsw 2067, australia objective to obtain the slope and srt of the p-i function for mandarin short sentences in 4-talker babble noise, and evaluate/adjust the homogeneity all sentences individually.

目的 获得嘈杂语噪声背景下汉语短句识别率-信噪比（performance-intensity， p-i）函数的斜率和50%的得分所对应的信噪比(记为snr50)，并对所有短句的同质性进行评估和调整。

National Acoustic Laboratories, 126 Greville Street, NSW 2067, Australia Objective To obtain the slope and SRT of the P-I function for Mandarin short sentences in 4-talker babble noise, and uate/adjust the homogeneity all sentences individually.

目的 获得嘈杂语噪声背景下汉语短句识别率-信噪比（Performance-Intensity， P-I）函数的斜率和50%的得分所对应的信噪比(记为SNR50)，并对所有短句的同质性进行评估和调整。

I cannot participate in the table talk, but I join in with the laughter over comments I don't understand and watch the genial hullabaloo with delight.

我每法参与餐桌上的交谈，虽然不懂他们说什么但在他们笑时我和他们一起笑，看着他们愉快地噪噪着。

Aimed at low-SNR infrared images,the principle,invariant property and computational methods of Pseudo-Zernike moments are analyzed,and a method for low-SNR infrared target detection based on Pseudo-Zernike moments is proposed.

针对低信噪比红外目标图像，分析了伪Zernike矩的基本原理、不变性和计算方法，提出了低信噪比红外目标检测的伪Zernike矩方法，并比较了模板匹配、Hu矩、伪Zernike矩方法的目标检测效果。

This thesis mainly discuss following issues, Theory and simple expressions for array covariance matrixes are derived when angular spread functions are symmetric distribution functions, i. e. the Uniform distribution, the Gauss distribution, the Laplace distribution and the Von Mises distribution, and a non-symmetric distribution function, i. e. the Gamma distribution. And the relation between the effective signal subspace and the array number, or and the nominal angle of the distributed source, the angular spread, the distributed functions, and the Signal-to-Noise Ratio is gained. The dimension of the effective signal subspace increases with increment of the array number. And it is more obvious to the non-symmetric distribution. The dimension of the effective signal subspace decreases with increment of the nominal angle. And the distributed source is equal to a point source as θ=π/2. The dimension of the effective signal subspace increases with increment of the angular spread.

本论文针对阵列信号处理中广泛存在的分布源现象，主要讨论了以下问题：推导了角度分布函数分别为对称的均匀分布、高斯分布、拉普拉斯分布、Von Mises分布和非对称的伽马分布时，分布源阵列接收信号协方差阵的严格模型和简化模型，得到了单个分布源的有效信号子空间随阵元数、分布源中心角、分布角、角度分布函数和信噪比的变化规律：随着阵元数的增加，对所有角度分布函数的有效信号子空间维数也随着增加，且非对称分布函数的有效信号子空间充满整个空间的可能性更大；随着分布源中心角逐步增加，有效信号子空间维数逐步减小，当θ=π/2时，等价于点源情形；随着分布源分布角逐渐加大，有效信号子空间维数也随之增加，直到有效信号子空间充满整个空间；随着信噪比的增加，有效信号子空间维数有一定程度的减少。

The simulation results show that the denoising effects of the three methods are all superior to that o f Fourier transform, and the influence of colored noise can be eliminated effectively by bispectrum methods. That is very i mportant for reconstructing LoranˉC signal under the condition of small signalˉtoˉnoise ratio, and also lays the fou ndation for digital LoranˉC signal processing.

仿真分析结果表明，三种方法的去噪效果都优于传统的傅氏变换法，且双谱估计能够有效地去除色噪声的影响，对于小信噪比条件下的罗兰C信号的提取和恢复具有重要意义，也为复杂环境下对罗兰C信号的数字处理奠定了良好的基础。

The mean pixel va lues of the muscles and the background standard deviation were measured alternat ively.

结果：脑白质在第一回波的信噪比为73.67，在第二回波的信噪比为27.61。

An energy model of image denoising in matrix norm is presented for restoring noisy image.

基于奇异值分解和能量最小原则，提出了一种自适应图像降噪算法，并给出了基于有界变差的能量降噪模型的代数形式。

When using the threshold method to remove the noise, the useful information in the detail abundant areas would be thrown off, and the edge appears mistiness.

摘 要：在图像降噪中，小波阈值法可以有效的降低图像的噪声，但是图像中存在平坦区域和细节丰富的区域，对细节丰富的区域用阈值方法消噪时，会去除掉有用的信息，出现边缘模糊等现象。

According to the signal-to-noise ratio of the spectrum resulting from the FSD procedure,it is proved that pixels on the large optical path difference are important for the shape of spectrum.

该算法根据退卷积技术对复原光谱信噪比的影响，推导出时域中随着光程差的增大，干涉图像压缩失真对频域中光谱曲线的信噪比影响越大。

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。