3. Differentiate a signal (dt1 and dt1dt1; dt1dt1 is non causal)
From signal 2 (speed v in Km/h) a copy is made with differentiate formula, and from this differentiated signal a copy to filter this signal. This is often usefull, because a noisy differentiated signal can be very noisy.
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Signal 6 is differentiated with function dt1 with time constate T of
100ms and gain of 10 (/0.1)
If the acceleartion is 1m/s^2 = 3.6Km/h, then the output of a differentiatior is:
dv/dt^2 = v (Km/h) * T * K ----> output(m/s-2) = v * 0.1 / 0.1 /3.6
If the time constante is 0.5s then the formual must be dt1(0.5)/0.5/3.6 (in this case the differentiated signal is slower, but less noisy)
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Signal 7 is filtered twice; from start to end of protocol and from end to start; it is a
non-causal filter of 50ms!
Advantage: there is no phase shift to the original signal; ideal for subsequent documentation or a better view of noisy signals