def de_gaussian_normalize_mel_channel(mel, mu, sigma):
    """

    Args:
        mel: (n_mels, frame_len)
        mu: (n_mels,), mean value
        sigma: (n_mels,), sd value
    Return:
        Tensor like mel
    """
    mu = np.expand_dims(mu, -1)
    sigma = np.expand_dims(sigma, -1)
    return sigma * mel + mu
Args:
mel: (n_mels, frame_len)
mu: (n_mels,), mean value
sigma: (n_mels,), sd value
Return:
Tensor like mel
utils/dsp.py