我最近做了关于MFCC的功课,我不知道使用这些库之间有什么区别。在
我使用的3个库是:
samplerate = 16000
NFFT = 512
NCEPT = 13
第一部分:Mel过滤器组
^{pr2}$Only the shape in speechpy will get (, 512), other all (, 257). The figure of librosa is a bit of deformation.
第二部分:MFCC
# pyspeech without lifter. Using hamming
temp1_mfcc = pyspeech.mfcc(speaker1, samplerate=sample1, winlen=0.025, winstep=0.01, numcep=NCEPT, nfilt=NFILT, nfft=NFFT,
preemph=0.97, ceplifter=0, winfunc=np.hamming, appendEnergy=False)
# speechpy need pre-emphasized. Using rectangular window fixed. Mel filter bank is not the same
temp2_mfcc = speechpy.feature.mfcc(emphasized_speaker1, sampling_frequency=sample1, frame_length=0.025, frame_stride=0.01,
num_cepstral=NCEPT, num_filters=NFILT, fft_length=NFFT)
# librosa need pre-emphasized. Using log energy. Its STFT using hanning, but its framing is not the same
temp3_energy = librosa.feature.melspectrogram(emphasized_speaker1, sr=sample1, S=temp3_pow.T, n_fft=NFFT,
hop_length=frame_step, n_mels=NFILT).T
temp3_energy = np.log(temp3_energy)
temp3_mfcc = librosa.feature.mfcc(emphasized_speaker1, sr=sample1, S=temp3_energy.T, n_mfcc=13, dct_type=2, n_fft=NFFT,
hop_length=frame_step).T
I've tried my best to set the condition faire. The figure of speechpy gets darker.
第三部分:三角洲系数
temp1 = pyspeech.delta(mfcc_speaker1, 2)
temp2 = speechpy.processing.derivative_extraction(mfcc_speaker1.T, 1).T
# librosa along the frame axis
temp3 = librosa.feature.delta(mfcc_speaker1, width=5, axis=0, order=1)
I can't directly set mfcc as argument in speechpy, or it will be very strange. And what these parameters originally act is not the same as my expected.
我想知道是什么因素造成了这些差异。只是我上面提到的吗?还是我犯了些错误?希望了解详情,谢谢。在
MFCC的实现有很多种,而且它们常常一点一点地不同—窗口函数形状、mel滤波器组计算、dct也可能不同。很难找到完全兼容的库。从长远来看,只要您在任何地方都使用相同的实现,这对您来说不重要。这些差异并不影响结果。在
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