TFMethods.py 文件源码

def sincinterp(x):
        """
        Sinc interpolation for computation of fractional transformations.
        As appears in :
        -https://github.com/audiolabs/frft/
        ----------
        Args:
            f       : (array) Complex valued input array
            a       : (float) Alpha factor
        Returns:
            ret     : (array) Real valued synthesised data
        """
        N = len(x)
        y = np.zeros(2 * N - 1, dtype=x.dtype)
        y[:2 * N:2] = x
        xint = fftconvolve( y[:2 * N], np.sinc(np.arange(-(2 * N - 3), (2 * N - 2)).T / 2),)
        return xint[2 * N - 3: -2 * N + 3]