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multivac61/freq_from_ZCR.py

Last active December 18, 2015 11:05
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freq_from_ZCR.py
def freq_from_ZCR(sig, fs):
# Find all indices right before a rising-edge zero crossing
indices = find((sig[1:] >= 0) & (sig[:-1] < 0))
crossings = interpolate(indices, sig)
return fs / np.mean(np.diff(crossings))
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