以下为句子列表：
英文: A partitioned optimal filtering algorithm for multi-channel systems with multiplicative noise among observation channels is proposed.
中文: 摘要针对多通道观测环境下带乘性噪声系统的最优滤波问题，提出了1种状态最优滤波的分部算法。
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英文: Abstract: A time domain recursive low pass filtering algorithm based on Kalman filtering theo-ry is analyzed.
中文: 文摘:分析了一种基于卡尔曼滤波理论的时域递归低通滤波算法。
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英文: The A/D transformation function of PC sound card is used to gather noise signal. wavelet packet filtering algorithm is used to eliminate the noise that is independent of the frequency of rotating and pick up the real vibration.
中文: 利用计算机声卡的A/D转换功能来采集电动机的噪声信号，应用小波包滤波方法消除与回转频率无关的噪声干扰，提取与转速直接相关的振动信号。
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