Lung-Yu,Tsai 的部落格

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def sgn(val):
    if val > 0:
        return 1
    else:
        return 0

def zero_crossing_rate(s):
    zcr = 0 
    for i in range(1,len(s)):
        zcr += abs(sgn(s[i]) - sgn(s[i - 1]))

    return zcr