audio_tools.py 文件源码

def cheaptrick(x, fs, temporal_positions, f0_sequence,
        vuv, fftlen="auto", q1=-0.15):
    f0_sequence = f0_sequence.copy()
    f0_low_limit = 71
    default_f0 = 500
    if fftlen == "auto":
        fftlen = int(2 ** np.ceil(np.log2(3. * float(fs) / f0_low_limit + 1)))
    #raise ValueError("Only fftlen auto currently supported")
    fft_size = fftlen
    f0_low_limit = fs * 3.0 / (fft_size - 3.0)
    f0_sequence[vuv == 0] = default_f0
    spectrogram = np.zeros((int(fft_size / 2.) + 1, len(f0_sequence)))
    for i in range(len(f0_sequence)):
        if f0_sequence[i] < f0_low_limit:
            f0_sequence[i] = default_f0
        spectrogram[:, i] = cheaptrick_estimate_one_slice(x, fs, f0_sequence[i],
                temporal_positions[i], fft_size, q1)
    return temporal_positions, spectrogram.T, fs