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Accelerometry design filter and outline

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Julio Martín
Julio Martín 2021-11-2
评论： Star Strider 2021-11-3
Hi, would like to ask 2 vinculated questions:
1) Need to know wich is the right design for an accelerometry filter
I have desing one myself, (attending several researches):
Fs = 100; % Sampling Frequency
  • Fstop1 = 2; % First Stopband Frequency
  • Fpass1 = 3; % First Passband Frequency
  • Fpass2 = 7; % Second Passband Frequency
  • Fstop2 = 8; % Second Stopband Frequency
  • Astop1 = 60; % First Stopband Attenuation (dB)
  • Apass = 1; % Passband Ripple (dB)
  • Astop2 = 80; % Second Stopband Attenuation (dB)
  • match = 'stopband'; % Band to match exactly
Is this right?
2) The result can be seen in ths plot:
I have already smoothed the data, but as you can see, there are still many peaks. Is there anyway to outline better those peaks
Thank you
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Julio Martín
Julio Martín 2021-11-3
Does not appear accept button, do you know why?
Star Strider
Star Strider 2021-11-3
The Accept button does not appear because I posted it as a Comment, not an Answer. I have now posted it as an Answer, so it can now be accepted.
Thank you!
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Star Strider
Star Strider 2021-11-3
Consider decreasing ‘Fpass2’ and ‘Fstop2’ since they are obviously not filtering out the high-frequency noise.
To design the filter a bit more scientifically, calculate the fft of the time-domain signal first, then use that information to determine the optimal filter passband and stopband frequencies. (Since the signal may have a d-c offset, subtract the mean of the signal first, before claculating the fft, to show the other peaks more clearly.)

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