utils.py 文件源码

def spectrogram2wav(spectrogram):
    '''
    spectrogram: [t, f], i.e. [t, nfft // 2 + 1]
    '''
    spectrogram = spectrogram.T  # [f, t]
    X_best = copy.deepcopy(spectrogram)  # [f, t]
    for i in range(hp.n_iter):
        X_t = invert_spectrogram(X_best)
        est = librosa.stft(X_t, hp.n_fft, hp.hop_length, win_length=hp.win_length)  # [f, t]
        phase = est / np.maximum(1e-8, np.abs(est))  # [f, t]
        X_best = spectrogram * phase  # [f, t]
    X_t = invert_spectrogram(X_best)

    return np.real(X_t)