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Added numerical stability … #6

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Added numerical stability … #6

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3 changes: 2 additions & 1 deletion scikits/talkbox/features/mfcc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,8 @@ def mfcc(input, nwin=256, nfft=512, fs=16000, nceps=13):
# Compute the spectrum magnitude
spec = np.abs(fft(framed, nfft, axis=-1))
# Filter the spectrum through the triangle filterbank
mspec = np.log10(np.dot(spec, fbank.T))
epsilon = 1e-6
mspec = np.log10(np.dot(np.maximum(spec, epsilon), fbank.T))
# Use the DCT to 'compress' the coefficients (spectrum -> cepstrum domain)
ceps = dct(mspec, type=2, norm='ortho', axis=-1)[:, :nceps]

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