我目前正在尝试将mel频谱图转换回音频文件,但是,librosa的mel_to_stft函数在以384kHz采样的30秒.wav文件中读取需要很长时间(最多15分钟)
以下是我的代码:
# Code for high pass filter
def butter_highpass(cutoff, fs, order=5):
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = butter(order, normal_cutoff, btype='high', analog=False)
return b, a
def butter_highpass_filter(data, cutoff, fs, order=5):
b, a = butter_highpass(cutoff, fs, order=order)
y = filtfilt(b, a, data)
return y
def high_pass_filter(data, sr):
# set as a highpass filter for 500 Hz
filtered_signal = butter_highpass_filter(data, 500, sr, order=5)
return filtered_signal
example_dir = '/Test/test.wav'
sr, data = wavfile.read(example_dir)
des_sr = 44100
data_resamp = samplerate.resample(data, des_sr/sr, 'sinc_best')
data_hp = high_pass_filter(data_resamp, des_sr)
mel_spect = librosa.feature.melspectrogram(y=data_resamp, sr=des_sr)
S = librosa.feature.inverse.mel_to_stft(mel_spect)
y = librosa.griffinlim(S)
Griffin Lim是一种迭代方法,用于从仅幅度谱图估计所需的相位信息。librosa实现中的迭代次数可以调整(
n_iter
)。减少这一点会使事情加快一点,但总体来说是缓慢的通过以下方法可以加快频谱处理后返回波形的速度:
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