中文说明：应用背景在信号处理领域中，互相关（有时也称为“互协方差”）是用来表示两个信号之间相似性的一个度量，通常通过与已知信号比较用于寻找未知信号中的特性。它是两个信号之间相对于时间的一个函数，有时也称为滑动点积，在模式识别以及密码分析学领域都有应用。关键技术对信号进 行直接相关来估计两路信号的到达时差，也就是 通过比较两路信号之间的相似性来估计时差。输出delay。
English Description：
Application backgroundIn the field of signal processing, cross-correlation (sometimes referred to as the "covariance") is used to represent the similarity between two signals of a measure, usually by with a known signal is used to find the characteristics of the unknown signal. It is a function of the time between the two signals, sometimes referred to as sliding dot product, in pattern recognition and password analysis field are all applications.Key TechnologyThe arrival time difference of two signals is directly related to the signal, and the difference is estimated by comparing the similarity between two signals. Output delay.