中文说明：
拉格朗日法实现多采样率的小数时延的实现，插值增加采样率，增加小数时延后，再以相同的速率抽取使其还原成原始采样率 。
English Description：
Lagrange method is used to realize the fractional time delay of multiple sampling rates. Interpolation increases the sampling rate, increases the fractional time delay, and then extracts at the same rate to restore it to the original sampling rate.