linear subspaces中文什么意思

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1. it's a problem of great significance how to filtering a signal in joint time-frequency domain and reconstruct the time series from the time-frequency plane selected . in this thesis, the theory of joint time-frequency analysis and synthesis and time-frequency filtering is investigated . two kinds of new time-frequency domain filtering methods are proposed based on adaptive decomposition and linear subspace projection
   本文在系统学习现有的各种时频分析及其综合算法的基础上，详细研究了时频域滤波的核心思想和基本方法，吸取了自适应时频分析和线性子空间投影wigner-ville变换的优点，提出了的两种新的时频域滤波方法，并通过理论分析和数字仿真完成了相应的数值特性与应用特性研究。