以下为句子列表：
英文: AE signals released from different lay-ups composite specimens were acquired by a wideband transducer, and fracture surfaces of the specimens were observed by scanning electron microscope (SEM).
中文: 宽带传感器记录了不同角度纤维铺层的复合材料试样在拉伸破坏过程中的声发射信号，用扫描电子显微镜(SEM)观察了试样的几种典型的损伤破坏断面，对比分析了不同类型的损伤机制。
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英文: Abstract: A noise model for the analog correlator used in the ultra wideband receivers is proposed due to lack of simulation capability on noise performance of the correlator in current EDA tools.The analog correlator circuit is divided into several parts
中文: 文摘:给出了分析模拟相关器的噪声模型.将相关器分成不同的几个子模块后,对各模块分别计算等效噪声源.然后用理想脉冲源代替噪声源计算电路的时变传输函数,接着用傅里叶变换计算输入输出的频域关系.利用电路的对称结构合并对称的子模块可以进一步简化模型.该模型可以用来估计相关器的噪声性能.
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英文: Abstract: In this paper,an orthogonal multicode wideband CDMA system modelincluding pilot channel based on chaos spreading sequences is given.Based on chaos sequences,with pilot channel inserted orthogonally,it is shown that the performance of the system
中文: 文摘:提出一种基于混沌序列含导频信号的宽带正交多码CDMA系统模型，利用混沌序列以及采用正交插入导频信号提高系统性能，并对此模型在衰落信道中的性能进行分析。
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英文: Abstract: The advances in stealth-aircraft technology overseas are reviewed in detail.The principal features of ultra-wideband impulse radar and its important applications in counter-stealth systems are also investigated.
中文: 文摘:综述了当前国外飞机隐形技术的发展状况，分析了超宽带冲击雷达的主要特点和在反隐形技术上的应用研究状况。
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英文: Abstract：We developed a real-time wideband speech codec adopting a wavelet packet based methodology.
中文: 摘要：本文论述采用小波包法进行实时宽带语音编码。
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