How to calculating Zero Crossing Rate (ZCR) & Mean Crossing Rate (MCR) in an array?

Question

I am trying to create two python methods that provides ZCR & MCR of an array as mentioned in the research paper

Here are my code for ZCR :

    def getZeroCrossingRate(self,arr):
        my_array = np.array(arr)
        return float("{0:.2f}".format((((my_array[:-1] * my_array[1:]) < 0).sum())/len(arr)))

Input  : [1,2,-3,4,5,-6,-2,-6,2]
Output : 0.44

For MCR , should i average out the ZCR calculated from other segments ?

Answer 1

You can use your ZCR function to compute the MCR like so:

def getMeanCrossingRate(self, arr):
    return self.getZeroCrossingRate(np.array(arr) - np.mean(arr))