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分布式声传感器阵列校准方法综述 被引量:3
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作者 王睿 陈喆 殷福亮 《电子学报》 EI CAS CSCD 北大核心 2021年第12期2468-2478,共11页
分布式声传感器阵列在军事侦察、公共安全监控和人机交互等领域应用广泛.但时钟异步、频率响应失配和节点位置未知问题严重影响后续基于分布式声传感器阵列的语音处理算法的性能,因此近年来学者们热衷于研究校准这三类阵列失配问题的方... 分布式声传感器阵列在军事侦察、公共安全监控和人机交互等领域应用广泛.但时钟异步、频率响应失配和节点位置未知问题严重影响后续基于分布式声传感器阵列的语音处理算法的性能,因此近年来学者们热衷于研究校准这三类阵列失配问题的方法.首先,本文介绍了导致分布式声传感器网络各类失配问题的原因和三类问题解决的先后顺序.然后,将现有的解决三类问题的方法进行了综述.其中,时钟同步方法主要包括基于时间戳交换和短时傅里叶变换域线性相位漂移的方法,频率响应校准方法主要包括基于声源导向矢量和自适应滤波器的方法,节点位置/位姿校准方法则主要包括基于节点间几何构型和深度学习的方法.最后,给出了本领域未来研究的方向. 展开更多
关键词 分布式声传感器阵列 阵列失配 阵列校准 位置校准 频率响应校准 时钟同步
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Measurement of 3db Bandwidth of Laser Diode Chips
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作者 徐遥 王圩 王子宇 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2003年第8期794-797,共4页
An accurate technique for measuring the frequency response of semiconductor laser diode chips is proposed and experimentally demonstrated.The effects of test jig parasites can be completely removed in the measurement ... An accurate technique for measuring the frequency response of semiconductor laser diode chips is proposed and experimentally demonstrated.The effects of test jig parasites can be completely removed in the measurement by a new calibration method.In theory,the measuring range of the measurement system is only determined by the measuring range of the instruments network analyzer and photo detector.Diodes' bandwidth of 7 5GHz and 10GHz is measured.The results reveal that the method is feasible and comparing with other method,it is more precise and easier to use. 展开更多
关键词 bandwidth measurement CALIBRATION frequency response semiconductor laser diode chips
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Accurate frequency response characterization of photoreceivers
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作者 苗昂 蒋明 杨宏 《Optoelectronics Letters》 EI 2011年第3期191-193,共3页
An accurate frequency response characterization method for photoreceivers with optical heterodyne technique is presented in this paper.The characterization is implemented with two single-mode tunable lasers operating ... An accurate frequency response characterization method for photoreceivers with optical heterodyne technique is presented in this paper.The characterization is implemented with two single-mode tunable lasers operating near the wavelength of 1.55 μm.The errors introduced by extra fixtures as well as laser output fluctuations are considered and calibrated simultaneously.Compared with previous works,the proposed calibration procedures are more complete.Experimental results indicate that the significant improvement in measurement precision has been achieved with the proposed method in the frequency range from 0 to 30 GHz,which proves the proposed frequency response characterization method to be feasible and reliable. 展开更多
关键词 CHARACTERIZATION LASERS
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