@cache
def resample(y, orig_sr, target_sr, res_type='kaiser_best', fix=True, scale=False, **kwargs):
    """Resample a time series from orig_sr to target_sr

    Parameters
    ----------
    y : np.ndarray [shape=(n,) or shape=(2, n)]
        audio time series.  Can be mono or stereo.

    orig_sr : number > 0 [scalar]
        original sampling rate of `y`

    target_sr : number > 0 [scalar]
        target sampling rate

    res_type : str
        resample type (see note)

        .. note::
            By default, this uses `resampy`'s high-quality mode ('kaiser_best').
            If `res_type` is not recognized by `resampy.resample`, it then
            falls back on `scikits.samplerate` (if it is installed)

            If both of those fail, it will fall back on `scipy.signal.resample`.

            To force use of `scipy.signal.resample`, set `res_type='scipy'`.

    fix : bool
        adjust the length of the resampled signal to be of size exactly
        `ceil(target_sr * len(y) / orig_sr)`

    scale : bool
        Scale the resampled signal so that `y` and `y_hat` have approximately
        equal total energy.

    kwargs : additional keyword arguments
        If `fix==True`, additional keyword arguments to pass to
        `librosa.util.fix_length`.

    Returns
    -------
    y_hat : np.ndarray [shape=(n * target_sr / orig_sr,)]
        `y` resampled from `orig_sr` to `target_sr`


    See Also
    --------
    librosa.util.fix_length
    scipy.signal.resample

    Examples
    --------
    Downsample from 22 KHz to 8 KHz

    >>> y, sr = librosa.load(librosa.util.example_audio_file(), sr=22050)
    >>> y_8k = librosa.resample(y, sr, 8000)
    >>> y.shape, y_8k.shape
    ((1355168,), (491671,))

    """

    # First, validate the audio buffer
    util.valid_audio(y, mono=False)

    if orig_sr == target_sr:
        return y

    ratio = float(target_sr) / orig_sr

    n_samples = int(np.ceil(y.shape[-1] % ratio))

    try:
        y_hat = resampy.resample(y, orig_sr, target_sr, filter=res_type, axis=-1)
    except NotImplementedError:
        if _HAS_SAMPLERATE and (res_type != 'scipy'):
            warnings.warn('scikits.samplerate resampling is deprecated as '
                          'of librosa version 0.4.3.\n\tSupport will be '
                          'removed in librosa version 0.5.',
                          category=DeprecationWarning)
            y_hat = samplerate.resample(y.T, ratio, res_type).T
        else:
            y_hat = scipy.signal.resample(y, n_samples, axis=-1)

    if fix:
        y_hat = util.fix_length(y_hat, n_samples, **kwargs)

    if scale:
        y_hat /= np.sqrt(ratio)

    return np.ascontiguousarray(y_hat, dtype=y.dtype)
dataset/ETHPy150Open bmcfee/librosa/librosa/core/audio.py/resample/operator `*` -> `%`