generate.py 文件源码

def spectrogram2wav(spectrogram, n_fft, win_length, hop_length, num_iters):
    '''
    spectrogram: [t, f], i.e. [t, nfft // 2 + 1]
    '''
    min_level_db = -100
    ref_level_db = 20

    spec = spectrogram.T
    # denormalize
    spec = (np.clip(spec, 0, 1) * - min_level_db) + min_level_db
    spec = spec + ref_level_db

    # Convert back to linear
    spec = np.power(10.0, spec * 0.05)

    return _griffin_lim(spec ** 1.5, n_fft, win_length, hop_length, num_iters)  # Reconstruct phase