The method using the part imitate extract the continuous spectrum of the signal spectrum, than extract line-spectrum from the relatively flat line-spectrum by subtract it from the former spectrum.

• 该方法利用分段拟合方法拟合出信号功率谱的连续部分，从原始功率谱中减去连续谱得到拉平的线谱分布，然后进行线谱特征提取。