中文说明：
频率估计问题一直是研究的热点。此为一个相位差法估计频率的程序代码，可供学习参考。
English Description：
The problem of frequency estimation has always been a research hotspot. This is a phase difference method to estimate the frequency of the program code, for learning reference< br/>
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中文说明：
频率估计问题一直是研究的热点。此为一个相位差法估计频率的程序代码，可供学习参考。
English Description：
The problem of frequency estimation has always been a research hotspot. This is a phase difference method to estimate the frequency of the program code, for learning reference< br/>
xiangweichafa_1.m