Filter Signal: High or Low Pass?

[trn09]

When a signal from an accelerometer is being filtered should a high or low pass filter be used? I am trying to isolate a particular instance in which we suddenly stopped but I am not sure wether a high or low pass would isolate this.

 

[reddvoid]

You should know the frequency of the signal you are trying to isolate. . .

 

[berkeman]

When a signal from an accelerometer is being filtered should a high or low pass filter be used? I am trying to isolate a particular instance in which we suddenly stopped but I am not sure wether a high or low pass would isolate this.

A constant acceleration would give you a DC signal, so a highpass would keep you from being able to sense that. The sudden stop will have high-frequency components, so a lowpass filter would not be appropriate.

As stated, you need to figure out what the frequency range of interest is, and what the frequency range of noise is, and make some tradeoffs.