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代码说明：

  首先定义累计量函数，然后通过调用四阶累计量来实现有色噪声中谐波恢复，但有个缺点是信号源估计在实际应用时应有所改进！(First, the definition of cumulant function, and then by calling the fourth-order cumulant to achieve the harmonic retrieval in colored noise, but one drawback is that the signal source is estimated that in practical applications should be improved!)