fft.py 文件源码

def transform_audio(self, y):
        '''Compute the STFT magnitude and phase.

        Parameters
        ----------
        y : np.ndarray
            The audio buffer

        Returns
        -------
        data : dict
            data['mag'] : np.ndarray, shape=(n_frames, 1 + n_fft//2)
                STFT magnitude

            data['phase'] : np.ndarray, shape=(n_frames, 1 + n_fft//2)
                STFT phase
        '''
        n_frames = self.n_frames(get_duration(y=y, sr=self.sr))

        D = stft(y, hop_length=self.hop_length,
                 n_fft=self.n_fft)

        D = fix_length(D, n_frames)

        mag, phase = magphase(D)
        if self.log:
            mag = amplitude_to_db(mag, ref=np.max)

        return {'mag': mag.T[self.idx].astype(np.float32),
                'phase': np.angle(phase.T)[self.idx].astype(np.float32)}