This is a simple thing to do if you are willing to use a piecewise linear interpolant. More difficult is when the curve is a parametric spline or pchip model. The interparc.m function uses an ode solver to integrate the

输入一wav格式声音信号 输出对声音信号进行抽取并插值后的频谱图(源程序为8倍重采样)，并可使用play函数进行播放试听，如play(nearest),play(ori) 有ori原始音质、ups插值音质、downs抽取音质三种及以下五种重采样音质 重采样试听种类有nearest,linear,spline,pchip,cubic，插值算法详见interp1函数 可用过取消注释“高斯白噪声”、“高频噪声”对声音信号加入噪

Shows various methods of interpolating a function with standard methods (ZOH, FOH, spline, pchip)

Interpolation by PCHIP and Spline(This is show the Interpolation method by PCHIP and Spline)