Tuesday, October 9, 2018

filters - Derivative of noisy signal


My input signal is phase vector. I want to differentiate it to get frequency vector. My input signal is somewhat noisy. Here is the input signal. Input signal


This is the derivative of the input signal as calculated using


diff(inputSig)

Derrivative of input signal


When i differentiate this signal, I am not getting a smooth curve. The output looks 'spikey'. I am guessing it is because of the noise in the input signal (is this 'derivative kick'?). How to avoid this and get a smooth derivative curve?





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