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Spatial filter is the key unit of high power solid laser system for nonlinear increase control. However, the plasma closure occurred in pinhole is easily happened when long pulse running which may reduce the beam quality. The optimum design of pinhole will meet the needs for long pulse running which is important for spatial filter application. This paper based the key problems, such as suppression...
An algorithm which can detect weak signals on the condition of strong correlated interference is designed in the paper. The algorithm based on conventional beam forming (CBF) can put nulls on given directions. And the weights only relating to interference's direction is given in the paper. Comparing to adaptive methods, the algorithm is robust and the calculation account is smaller. Simulation results...
Bioelectrical Signal is a weak signal which is buried in the noisy environment, how to recover the weak signal in a strong noisy environment is very important. The paper gets SEMG and EEG as examples, and proposes a de-noising method based on wavelet energy entropy to bioelectrical signal de-noising. First multi-scale wavelet decomposition of bioelectrical signal is performed by discrete wavelet transform;...
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