audio_tools.py 文件源码

def overlap_dct_uncompress(X_compressed, window_size):
    """
    Uncompress X as returned from ``overlap_compress``.

    Parameters
    ----------
    X_compressed : ndarray, shape=(n_windows, n_components)
        Windowed and compressed version of X

    window_size : int
        Size of windows originally used when compressing X

    Returns
    -------
    X_reconstructed : ndarray, shape=(n_samples,)
        Reconstructed version of X
    """
    if X_compressed.shape[1] % window_size != 0:
        append = np.zeros((X_compressed.shape[0], window_size -
                           X_compressed.shape[1] % window_size))
        X_compressed = np.hstack((X_compressed, append))
    X_r = fftpack.idct(X_compressed, norm='ortho')
    return invert_halfoverlap(X_r)