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Fixed some bugs in mel filterbanks. #36

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Fixed some bugs in mel filterbanks. #36

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af0e45a
Fix mel filterbanks freq_index compute error.
yorange1 Nov 5, 2021
02a748e
Fix mel filterbanks freq band edge initialization error.
yorange1 Nov 5, 2021
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12 changes: 8 additions & 4 deletions speechpy/feature.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,16 +44,18 @@ def filterbanks(
coefficients (int): (fftpoints//2 + 1). Default is 257.
sampling_freq (float): the samplerate of the signal we are working
with. It affects mel spacing.
low_freq (float): lowest band edge of mel filters, default 0 Hz
low_freq (float): lowest band edge of mel filters, default 300 Hz
high_freq (float): highest band edge of mel filters,
default samplerate/2

Returns:
array: A numpy array of size num_filter x (fftpoints//2 + 1)
which are filterbank
"""
high_freq = high_freq or sampling_freq / 2
low_freq = low_freq or 300
if high_freq is None:
high_freq = sampling_freq / 2
if low_freq is None:
low_freq = 300
s = "High frequency cannot be greater than half of the sampling frequency!"
assert high_freq <= sampling_freq / 2, s
assert low_freq >= 0, "low frequency cannot be less than zero!"
Expand All @@ -74,9 +76,11 @@ def filterbanks(
# The frequency resolution required to put filters at the
# exact points calculated above should be extracted.
# So we should round those frequencies to the closest FFT bin.

fftpoints = (coefficients - 1) * 2
freq_index = (
np.floor(
(coefficients +
(fftpoints +
1) *
hertz /
sampling_freq)).astype(int)
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