audio_tools.py 文件源码

def halfoverlap(X, window_size):
    """
    Create an overlapped version of X using 50% of window_size as overlap.

    Parameters
    ----------
    X : ndarray, shape=(n_samples,)
        Input signal to window and overlap

    window_size : int
        Size of windows to take

    Returns
    -------
    X_strided : shape=(n_windows, window_size)
        2D array of overlapped X
    """
    if window_size % 2 != 0:
        raise ValueError("Window size must be even!")
    window_step = window_size // 2
    # Make sure there are an even number of windows before stridetricks
    append = np.zeros((window_size - len(X) % window_size))
    X = np.hstack((X, append))
    num_frames = len(X) // window_step - 1
    row_stride = X.itemsize * window_step
    col_stride = X.itemsize
    X_strided = as_strided(X, shape=(num_frames, window_size),
                           strides=(row_stride, col_stride))
    return X_strided