这是关于可变分数延时滤波器的设计，适合初学者使用，相信对初学者有很大帮助-This is the variable fractional delay filter design, suitable for beginners to use, I believe there is a great help for beginners

分数延迟FIR滤波器的实现，分别使用了最小二乘法，拉格朗日插值法以及优化加权最小二乘法。-Fractional delay FIR filter implementation, using the least square method, the Lagrange interpolation method and optimization of weighted least squares.