信号分离

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Final, the number of the sources is estimated with multistage clutstering techniques and the corresponding sources are extracted. The proposed algorithm can avoid suffering the error propagation of the deflation technique, which exists in all sequential algorithms.4. A new post-processing method for convolutive mixtures blind speech separation is proposed.

针对现有卷积混合盲源分离的频域算法存在的问题，即恢复出的信号是源信号和一个未知的滤波器的卷积，且由于部分频率点处盲源分离方法的失效和无法精确解决排列和尺度模糊问题，分离出的信号中会泄露进其余的信号分量，影响分离性能。

Then, the relation between vibration and sound, the acoustic holography method, the indeterminacy and identifiability of BSS, the BSS algorithm are discussed in detail. Based on above researches, the dissertation is divided in following four sections. The first section investigates the BSS algorithm suitable to acoustic feature separation. The algorithm of the joint approximate diagonalization of eigen-matrices is proposed. The spectra or the time-frequency distributions of source signals are the interesting features in ABD and they are separated from mixing signals by JADE algorithm. Then, the convolutive mixing model is transformed into a high-dimension instantaneous mixing model, and the deconvolution of source signals is achieved by the joint approximate block diagonalization of eigen-matrices. The proposed algorithm has a global minimum, and it is unsensitive to noise interference.

论文首先概述国内外声学诊断研究进展与盲分离研究进展，给出机器噪声声场与盲分离的数学描述，讨论了声振辐射、声全息、盲分离模型、盲分离可解性、盲分离结果不确定性、分离算法等基本问题，在此基础上，论文的研究工作分为以下四个部分：第一部分研究适用于声学特征分离的盲分离算法，提出基于特征提取的联合近似对角化盲分离算法，该算法以频谱特征或时频特征作为分离目标，从混合信号中分离源信号频谱特征或时频特征，最大限度地保留了与声学特征提取有关的频谱特征或时频特征，采用模型变换把卷积混合模型变换为一个高维瞬时混合模型，通过联合近似分块对角化算法实现源信号频谱特征与时频特征的盲反卷积。

In Chapter 4, image space reconstruction algorithm and regression ICA are employed to construct a new algorithm for the estimation of overcomplete ICA and the stability and convergence conditions are also analyzed.

在第四章，我们把回归ICA以及盲信号分离中图像重构方法应用于ICA，从而获得一个新的欠定ICA算法，论文还分析了所提出算法的稳定收敛条件。

The dissertation analysis different measurement on channel frequency,different vibration signals sets and different location to form each ICA result.With regard to the failure diagnosis of the turbine generator operation,the study has explored the possibilities to detect the failure diagnosis source from the measurement signals.It has also provided sufficient analysis case for the application of separation to detecting failure source on the turbine generator.2.Aiming at the engineering application of overcomplete bases ICA,the dissertation has raised virtual channel on the new method of ICA.It take advantage of some testified knowledge to the constitution of ICA known as, together with other measurement signal to proceed ICA separation,which can increase frequency on the input signal.

分析了以不同测量通道数量、不同振动信号类型组合和不同测点位置组成输入信号的ICA分离效果，并对机组在故障状态下，从测量信号中分离出故障源的可能性进行了探讨，为ICA在汽轮机振动故障源分离方面的应用提供丰富的分析实例。2针对超完备基ICA的工程应用问题，提出附加虚拟通道ICA的新方法，利用某些已经具有先验知识的独立分量构成附加输入信号，与其它测量信号组合在一起进行ICA分离，达到增加输入信号数量的目的。

Semi-parametric Statistical Approach for Overdetermined Blind Source Separation［J］.

超定盲信号分离的半参数统计方法［J］。

Additionally, M-System offers the broadest line of signal splitters available.

此外，男，系统提供的信号分离器提供最广泛的。

Microwave and millimeter-wave filters and diplexers are important components for channel selection and signal separation in many communication systems. Their electrical performances are crucial for the overall system design.

在多数通信系统中，微波、毫米波滤波器和双工器是信道选择和信号分离的重要器件，它的电气性能对于整个系统至关重要。

Filters and diplexers are important components for channel selection and signal separation in modern microwave and millimeter-wave systems. Their electrical performances are crucial for communication systems.

在现代微波毫米波系统中，滤波器和双工器是重要部件之一，用于通道选择和信号分离，其性能的优劣直接影响整个通信系统的质量。

Moreover,the array considered here can be of arbitrary geometry and even uncalibrated.

理论分析与仿真结果表明，该方法能够有效地进行阵列响应估计和信号分离，在空分多址的实现方面具有较强的实用性。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。