transforms.py 文件源码

def __call__(self, y):
        """Short-time Fourier transform (STFT).

        Returns a real-valued matrix
        Returns a complex-valued matrix D such that
            `np.abs(D[f, t])` is the magnitude of frequency bin `f`
            at frame `t`

            `np.angle(D[f, t])` is the phase of frequency bin `f`
            at frame `t`

        Parameters
        ----------
        y : np.ndarray [shape=(n,)], real-valued
            the input signal (audio time series)

        Returns
        -------
        D : np.ndarray [shape=(1 + n_fft/2, t), dtype=dtype]
        STFT matrix

        """
        return librosa.stft(y, **self.__dict__)