audio_tools.py 文件源码

def dct_uncompress(X_compressed, window_size=128):
    """
    Uncompress a DCT compressed signal (such as returned by ``compress``).

    Parameters
    ----------
    X_compressed : ndarray, shape=(n_samples, n_features)
        Windowed and compressed array.

    window_size : int, optional (default=128)
        Size of the window used when ``compress`` was called.

    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 X_r.ravel()