AIM: to observe the effect of melatonin in treating elderly patients with primary insomnia by using the objective evaluating method of double blind placebo control.
目的：应用双盲安慰剂对照的客观评估方法观察褪黑素对老年原发性失眠患者的治疗作用。
A blind separation method was presented to separate vibration signals by using double decorrelation. Generally, the mixed signals should be whiten at first when using the blind separation method.
盲分离方法通常要求对混合信号进行去相关，提出了一种基于两次去相关的振动信号盲分离方法。
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