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时域平均处理是从混有噪声的复杂周期信号中提取感兴趣周期分量的有效方法。在详细讨论时域平均方法抑制非感兴趣周期分量原理的基础上，探讨了离散序列时域平均时截取长度误差对平均结果的影响，提出了一种时域平均合理截取段数的确定方法。通过工程实例说明了合理平均段数提出的必要性和使用的可行性。
Time-domain averaging is an efficient way to extract the periodic components of interest from the noisy complex periodic signal. Based on the detailed discussion of the principle of time-domain averaging suppression of non-interested periodic components, the effect of the length error on the averaged result of discrete-time time-domain averaging is discussed. A method for determining the average number of segments in the time domain is proposed. Through the example of engineering, it shows the necessity and the feasibility of using reasonable average number of segments.