best amount for my special chebyshef filter??

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ladan hz 2017-11-15

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评论： Star Strider 2017-11-15

i have data from a movement analysis system and i want to filter the data for noise, the best which i want is a lowpass filter of chebyshev ,but i dont know how to choose the wp,ws,Rp,Rs for my filter ,my sampling frequency is 960Hz from my platform data which are (GRFML,GRFV,GRFAp,COP,Torque) and 120Hz for my optoelectronic sy which are (Markers name) I think the Cut-off freq of 4 could be good I will really appriciate your help thanks a lot

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Answer 1

Star Strider 2017-11-15

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Calculate the fft (link) of your data to determine the frequency content. Then choose the passband and stopband frequencies from your visual inspection of the fft results. The passband and stopband ripple are arbitrary, 1 and 75 dB respectively work in most circumstances.