thinkdsp.py 文件源码

def make_dct(self):
        """Computes the DCT of this wave.
        """
        N = len(self.ys)
        hs = scipy.fftpack.dct(self.ys, type=2)
        fs = (0.5 + np.arange(N)) / 2
        return Dct(hs, fs, self.framerate)